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Testing VPN performance causes Pi ONE reboot

DreamDreams

By DreamDreams
in Allwinner sunxi

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DreamDreams

DreamDreams

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I was sort of disappointed with my RPi 2 VPN performance, which is about 2.5MiB/s while normal traffic can easily exceeds 5.5MiB/s. 

 

So I setup same VPN config on OPi One and run the test. The speed is impressive which is well above 5 MiB/s but it could only last about 10s before the box reboots itself. I can see one cpu core is occupied 100% by softirqd ( about 80% on RPi 2). My kernel version is 3.4.112 and StrongSwan version is 5.3.3. 

 

Don't have further information yet. When I get a chance to hook up serial console, I may collect more info. 

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DreamDreams

DreamDreams

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Kernel log from serial console:

[ 9240.894559] swapper/3: page allocation failure: order:10, mode:0x20
[ 9240.896677] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.896688] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.896698]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.896714]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.897241] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.897253] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.897262]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.897274]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.897400] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.897410] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.897419]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.897429]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.900264] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.900274] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.900283]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.900295]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.901423] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.901433] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.901442]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.901453]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.901770] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.901780] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.901789]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.901799]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.902073] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.902083] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.902092]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.902103]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.905836] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.905846] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.905855]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.905867]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.911896] swapper/2: page allocation failure: order:9, mode:0x20
[ 9240.911907] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.911916]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.911928]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9240.912015] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9240.912024]   cache: size-2097152, object size: 2097152, order: 9
[ 9240.912035]   node 0: slabs: 36/36, objs: 36/36, free: 0
[ 9246.175988] warn_alloc_failed: 344 callbacks suppressed
[ 9246.185939] swapper/3: page allocation failure: order:10, mode:0x20
[ 9246.185939] kmem_getpages: 344 callbacks suppressed
[ 9246.185939] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.185939]   cache: size-4194304, object size: 4194304, order: 10
[ 9246.185939]   node 0: slabs: 25/26, objs: 25/26, free: 1
[ 9246.324452] swapper/2: page allocation failure: order:10, mode:0x20
[ 9246.337061] swapper/3: page allocation failure: order:10, mode:0x20
[ 9246.337072] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.337081]   cache: size-4194304, object size: 4194304, order: 10
[ 9246.337095]   node 0: slabs: 26/26, objs: 26/26, free: 0
[ 9246.396937] swapper/0: page allocation failure: order:9, mode:0x20
[ 9246.396949] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.396959]   cache: size-2097152, object size: 2097152, order: 9
[ 9246.396974]   node 0: slabs: 31/31, objs: 31/31, free: 0
[ 9246.334408] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.334408]   cache: size-4194304, object size: 4194304, order: 10
[ 9246.334408]   node 0: slabs: 23/26, objs: 23/26, free: 3
[ 9246.505363] ksoftirqd/2: page allocation failure: order:9, mode:0x20
[ 9246.510339] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.510339]   cache: size-2097152, object size: 2097152, order: 9
[ 9246.540656] swapper/3: page allocation failure: order:9, mode:0x20
[ 9246.540666] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.540675]   cache: size-2097152, object size: 2097152, order: 9
[ 9246.540689]   node 0: slabs: 32/32, objs: 32/32, free: 0
[ 9246.554050] swapper/1: page allocation failure: order:9, mode:0x20
[ 9246.554061] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.554071]   cache: size-2097152, object size: 2097152, order: 9
[ 9246.554083]   node 0: slabs: 32/32, objs: 32/32, free: 0
[ 9246.510339]   node 0: slabs: 32/33, objs: 32/33, free: 1
[ 9246.842800] swapper/3: page allocation failure: order:9, mode:0x20
[ 9246.852754] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.852754]   cache: size-2097152, object size: 2097152, order: 9
[ 9246.852754]   node 0: slabs: 31/34, objs: 31/34, free: 3
[ 9246.940070] swapper/1: page allocation failure: order:10, mode:0x20
[ 9246.944507] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9246.944507]   cache: size-4194304, object size: 4194304, order: 10
[ 9246.944507]   node 0: slabs: 26/26, objs: 26/26, free: 0
[ 9247.000889] ksoftirqd/1: page allocation failure: order:10, mode:0x20
[ 9247.010035] SLAB: Unable to allocate memory on node 0 (gfp=0x20)
[ 9247.010035]   cache: size-4194304, object size: 4194304, order: 10
[ 9247.010035]   node 0: slabs: 26/26, objs: 26/26, free: 0
[ 9247.080344] Unable to handle kernel NULL pointer dereference at virtual address 00000004
[ 9247.090304] pgd = c0004000
[ 9247.090304] [00000004] *pgd=00000000
[ 9247.090304] sunxi oops: enable sdcard JTAG interface
[ 9247.090304] sunxi oops: cpu frequency: 1008 MHz
[ 9247.090304] sunxi oops: ddr frequency: 624 MHz
[ 9247.090304] sunxi oops: gpu frequency: 105 MHz
[ 9247.090304] sunxi oops: cpu temperature: 56 
[ 9247.090304] Internal error: Oops: 817 [#1] PREEMPT SMP ARM
[ 9247.090304] Modules linked in: xfrm6_mode_tunnel macvlan iptable_nat ipt_MASQUERADE nf_nat_ftp nf_nat nf_conntrack_ipv6 nf_conntrack_ipv4 xt_time xt_tcpudp xt_state xt_quota xt_pkttype xt_physdev xt_owner xt_multipor]
[ 9247.090304] CPU: 0    Not tainted  (3.4.112-sun8i #14)
[ 9247.090304] PC is at skb_dequeue+0x5c/0x74
[ 9247.090304] LR is at _raw_spin_lock_irqsave+0x18/0x1c
[ 9247.090304] pc : [<c0568164>]    lr : [<c069147c>]    psr: a0000193
[ 9247.090304] sp : c09b1da8  ip : 00000000  fp : c09b1dc4
[ 9247.090304] r10: 00000040  r9 : 000000c8  r8 : d75ddc60
[ 9247.090304] r7 : 000000c6  r6 : d5958538  r5 : d595852c  r4 : d2a76b00
[ 9247.090304] r3 : d595852c  r2 : 00000000  r1 : 60000113  r0 : 60000113
[ 9247.090304] Flags: NzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[ 9247.090304] Control: 10c5387d  Table: 54f2406a  DAC: 00000015
[ 9247.090304] 
[ 9247.090304] PC: 0xc05680e4:
[ 9247.090304] 80e4  e28320b4 e1921f9f e2811001 e1820f91 e3300000 1afffffa e5933000 eafffff5
[ 9247.090304] 8104  e89da800 e1a0c00d e92dd8f0 e24cb004 e52de004 e8bd4000 e280600c e1a05000
[ 9247.090304] 8124  e1a00006 eb04a4cd e5954000 e1550004 03a04000 e1a01000 0a00000a e3540000
[ 9247.090304] 8144  0a000008 e5953008 e3a0c000 e2433001 e5853008 e894000c e584c004 e584c000
[ 9247.090304] 8164  e5823004 e5832000 e1a00006 eb04a2f7 e1a00004 e89da8f0 e1a0c00d e92dd8f0
[ 9247.090304] 8184  e24cb004 e52de004 e8bd4000 e280600c e1a05000 e1a00006 eb04a4b0 e5954004
[ 9247.090304] 81a4  e1550004 03a04000 e1a01000 0a00000a e3540000 0a000008 e5953008 e3a0c000
[ 9247.090304] 81c4  e2433001 e5853008 e894000c e584c004 e584c000 e5823004 e5832000 e1a00006
[ 9247.090304] 
[ 9247.090304] LR: 0xc06913fc:
[ 9247.090304] 13fc  e3330000 01853f92 e3530000 0a000012 e121f000 e5943004 e2433001 e5843004
[ 9247.090304] 141c  e5943000 e3130002 0a000000 ebfffbd7 e5953004 e3530000 03a03001 05853004
[ 9247.090304] 143c  e5953000 e3530000 0affffe5 e5953004 e3530000 0affffe2 eafffff8 f57ff05f
[ 9247.090304] 145c  e5853004 e89da830 e1a0c00d e92dd800 e24cb004 e52de004 e8bd4000 ebffffcf
[ 9247.090304] 147c  e89da800 e1a0c00d e92dd800 e24cb004 e52de004 e8bd4000 ebfffff2 e89da800
[ 9247.090304] 149c  e1a0c00d e92dd800 e24cb004 e52de004 e8bd4000 ebffffeb e89da800 e1a0c00d
[ 9247.090304] 14bc  e92dd830 e24cb004 e52de004 e8bd4000 ebffffba e1a04000 ebe67a71 e121f004
[ 9247.090304] 14dc  e89da830 e1a0c00d e92dd800 e24cb004 e52de004 e8bd4000 ebffffef e89da800
[ 9247.090304] 
[ 9247.090304] SP: 0xc09b1d28:
[ 9247.090304] 1d28  00000000 20000113 c09b1d4c c09b1d40 c06913b8 c0573984 c0568164 a0000193
[ 9247.090304] 1d48  ffffffff c09b1d94 c09b1dc4 c09b1d60 c000dad8 c0008370 60000113 60000113
[ 9247.090304] 1d68  00000000 d595852c d2a76b00 d595852c d5958538 000000c6 d75ddc60 000000c8
[ 9247.090304] 1d88  00000040 c09b1dc4 00000000 c09b1da8 c069147c c0568164 a0000193 ffffffff
[ 9247.090304] 1da8  d5958000 c09ff2a0 c0ad5d54 000000c6 c09b1df4 c09b1dc8 c0463740 c0568114
[ 9247.090304] 1dc8  c0576a74 c0575d6c d5958548 d5958548 d2919b40 d75ddc80 00000001 390873e1
[ 9247.090304] 1de8  c09b1e34 c09b1df8 c0465b38 c04636bc 00000000 c09b1e08 c042148c 51800040
[ 9247.090304] 1e08  43b9e851 d5958548 c0ff1e00 00000001 c09b0000 0000012c 00000040 c0a257c3
[ 9247.090304] 
[ 9247.090304] FP: 0xc09b1d44:
[ 9247.090304] 1d44  a0000193 ffffffff c09b1d94 c09b1dc4 c09b1d60 c000dad8 c0008370 60000113
[ 9247.090304] 1d64  60000113 00000000 d595852c d2a76b00 d595852c d5958538 000000c6 d75ddc60
[ 9247.090304] 1d84  000000c8 00000040 c09b1dc4 00000000 c09b1da8 c069147c c0568164 a0000193
[ 9247.090304] 1da4  ffffffff d5958000 c09ff2a0 c0ad5d54 000000c6 c09b1df4 c09b1dc8 c0463740
[ 9247.090304] 1dc4  c0568114 c0576a74 c0575d6c d5958548 d5958548 d2919b40 d75ddc80 00000001
[ 9247.090304] 1de4  390873e1 c09b1e34 c09b1df8 c0465b38 c04636bc 00000000 c09b1e08 c042148c
[ 9247.090304] 1e04  51800040 43b9e851 d5958548 c0ff1e00 00000001 c09b0000 0000012c 00000040
[ 9247.090304] 1e24  c0a257c3 c09b1e74 c09b1e38 c0576bc8 c04659a8 c09b1e84 c09b20c0 c0ff1e08
[ 9247.090304] 
[ 9247.090304] R3: 0xd59584ac:
[ 9247.090304] 84ac  00000000 00000000 00000000 00000000 00000000 d5b8f800 00000000 00000000
[ 9247.090304] 84cc  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 84ec  00000000 00000000 00000000 00000000 00000000 d75dc000 d49a7c00 0000002f
[ 9247.090304] 850c  00000030 575dc000 000007ff d75dd000 d5b8f400 000000c6 000000c8 575dd000
[ 9247.090304] 852c  d2919b40 d1244d80 0000007e 00000001 00000000 d5958000 c09ff2f8 c0ff1e08
[ 9247.090304] 854c  c0ff1e08 00000001 00000040 c046599c 00000000 d5958000 d5958094 d5958094
[ 9247.090304] 856c  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 858c  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 
[ 9247.090304] R4: 0xd2a76a80:
[ 9247.090304] 6a80  00000000 00000000 00000000 00000000 00000040 00000000 0000000e 00000000
[ 9247.090304] 6aa0  00000000 00080004 00000000 d53a7b08 00000000 00000000 00000002 a6bb2759
[ 9247.090304] 6ac0  00000000 00000000 00000008 00000000 00000000 c3c0004e c3c0004e c3c00040
[ 9247.090304] 6ae0  c3c0008e c3ffff40 c3c00000 c3c0004e 000010c0 00000001 00000000 00000000
[ 9247.090304] 6b00  00000000 d29e9740 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 6b20  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 6b40  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 6b60  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 
[ 9247.090304] R5: 0xd59584ac:
[ 9247.090304] 84ac  00000000 00000000 00000000 00000000 00000000 d5b8f800 00000000 00000000
[ 9247.090304] 84cc  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 84ec  00000000 00000000 00000000 00000000 00000000 d75dc000 d49a7c00 0000002f
[ 9247.090304] 850c  00000030 575dc000 000007ff d75dd000 d5b8f400 000000c6 000000c8 575dd000
[ 9247.090304] 852c  d2919b40 d1244d80 0000007e 00000001 00000000 d5958000 c09ff2f8 c0ff1e08
[ 9247.090304] 854c  c0ff1e08 00000001 00000040 c046599c 00000000 d5958000 d5958094 d5958094
[ 9247.090304] 856c  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 858c  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 
[ 9247.090304] R6: 0xd59584b8:
[ 9247.090304] 84b8  00000000 00000000 d5b8f800 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 84d8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 84f8  00000000 00000000 d75dc000 d49a7c00 0000002f 00000030 575dc000 000007ff
[ 9247.090304] 8518  d75dd000 d5b8f400 000000c6 000000c8 575dd000 d2919b40 d1244d80 0000007e
[ 9247.090304] 8538  00000001 00000000 d5958000 c09ff2f8 c0ff1e08 c0ff1e08 00000001 00000040
[ 9247.090304] 8558  c046599c 00000000 d5958000 d5958094 d5958094 00000000 00000000 00000000
[ 9247.090304] 8578  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 8598  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9247.090304] 
[ 9247.090304] R8: 0xd75ddbe0:
[ 9247.090304] dbe0  05de0381 010007ff 5523a040 575ddbf0 05de0381 010007ff 55090040 575ddc00
[ 9247.090304] dc00  00800381 010007ff 42000040 575ddc10 05de0381 010007ff 4c000040 575ddc20
[ 9247.090304] dc20  05de0381 010007ff 50f70040 575ddc30 05de0381 010007ff 48400040 575ddc40
[ 9247.090304] dc40  05de0381 010007ff 523e0040 575ddc50 05de0381 010007ff 44800040 575ddc60
[ 9247.090304] dc60  05de0381 010007ff 51c80040 575ddc70 05de0381 010007ff 51800040 575ddc80
[ 9247.090304] dc80  05de0381 010007ff 53e60040 575ddc90 05de0381 010007ff 50d34040 575ddca0
[ 9247.090304] dca0  00460320 010007ff 514e0040 575ddcb0 00460320 010007ff 52afa040 575ddcc0
[ 9247.090304] dcc0  05de0381 010007ff 50eba040 575ddcd0 05de0381 010007ff 49700040 575ddce0
[ 9247.090304] Process swapper/0 (pid: 0, stack limit = 0xc09b02f8)
[ 9247.090304] Stack: (0xc09b1da8 to 0xc09b2000)
[ 9247.090304] 1da0:                   d5958000 c09ff2a0 c0ad5d54 000000c6 c09b1df4 c09b1dc8
[ 9247.090304] 1dc0: c0463740 c0568114 c0576a74 c0575d6c d5958548 d5958548 d2919b40 d75ddc80
[ 9247.090304] 1de0: 00000001 390873e1 c09b1e34 c09b1df8 c0465b38 c04636bc 00000000 c09b1e08
[ 9247.090304] 1e00: c042148c 51800040 43b9e851 d5958548 c0ff1e00 00000001 c09b0000 0000012c
[ 9247.090304] 1e20: 00000040 c0a257c3 c09b1e74 c09b1e38 c0576bc8 c04659a8 c09b1e84 c09b20c0
[ 9247.090304] 1e40: c0ff1e08 000da6f6 00000000 c09b0000 c09b208c 00000003 00000001 c0a4b2c0
[ 9247.090304] 1e60: 00000102 0000000a c09b1ebc c09b1e78 c00309e0 c0576af4 c09b1ea4 c09b1e88
[ 9247.090304] 1e80: c00a3174 c09b20c0 00000000 000da6f5 c09b7780 c09b0000 c09d3520 c09b0000
[ 9247.090304] 1ea0: 00000072 00000000 c098b824 00000000 c09b1ed4 c09b1ec0 c0030f88 c0030908
[ 9247.090304] 1ec0: c09ae230 c09d3520 c09b1efc c09b1ed8 c000ef58 c0030f3c c09d1ca0 c09b1f20
[ 9247.090304] 1ee0: f1c82000 c09b1f54 c0fecc00 c098b824 c09b1f1c c09b1f00 c000853c c000eed4
[ 9247.090304] 1f00: c000f2dc 60000013 ffffffff c09b1f54 c09b1f74 c09b1f20 c000db40 c00084fc
[ 9247.090304] 1f20: c0fefb38 c09d224c 0000000f 00000000 c09b0000 c0a4ca48 00000001 ffffffff
[ 9247.090304] 1f40: c0fecc00 c098b824 00000000 c09b1f74 c09b1f78 c09b1f68 c000f2d8 c000f2dc
[ 9247.090304] 1f60: 60000013 ffffffff c09b1f8c c09b1f78 c000f694 c000f2b4 c09b1f94 c0a4ca48
[ 9247.090304] 1f80: c09b1fb4 c09b1f90 c067f558 c000f5f8 c00ad2a8 00000001 00000000 c09d3300
[ 9247.090304] 1fa0: 00000000 c09d1c40 c09b1ff4 c09b1fb8 c095c8a8 c067f4c8 ffffffff ffffffff
[ 9247.090304] 1fc0: c095c33c 00000000 00000000 c098b824 10c5387d c09d1c9c c098b820 c09d7d44
[ 9247.090304] 1fe0: 4000406a 410fc075 00000000 c09b1ff8 40008044 c095c5c0 00000000 00000000
[ 9247.090304] [<c0568164>] (skb_dequeue+0x5c/0x74) from [<c0463740>] (geth_rx_refill+0x90/0x180)
[ 9247.090304] [<c0463740>] (geth_rx_refill+0x90/0x180) from [<c0465b38>] (geth_poll+0x19c/0x1cc)
[ 9247.090304] [<c0465b38>] (geth_poll+0x19c/0x1cc) from [<c0576bc8>] (net_rx_action+0xe0/0x1e0)
[ 9247.090304] [<c0576bc8>] (net_rx_action+0xe0/0x1e0) from [<c00309e0>] (__do_softirq+0xe4/0x240)
[ 9247.090304] [<c00309e0>] (__do_softirq+0xe4/0x240) from [<c0030f88>] (irq_exit+0x58/0xa4)
[ 9247.090304] [<c0030f88>] (irq_exit+0x58/0xa4) from [<c000ef58>] (handle_IRQ+0x90/0xbc)
[ 9247.090304] [<c000ef58>] (handle_IRQ+0x90/0xbc) from [<c000853c>] (gic_handle_irq+0x4c/0x6c)
[ 9247.090304] [<c000853c>] (gic_handle_irq+0x4c/0x6c) from [<c000db40>] (__irq_svc+0x40/0x74)
[ 9247.090304] Exception stack(0xc09b1f20 to 0xc09b1f68)
[ 9247.090304] 1f20: c0fefb38 c09d224c 0000000f 00000000 c09b0000 c0a4ca48 00000001 ffffffff
[ 9247.090304] 1f40: c0fecc00 c098b824 00000000 c09b1f74 c09b1f78 c09b1f68 c000f2d8 c000f2dc
[ 9247.090304] 1f60: 60000013 ffffffff
[ 9247.090304] [<c000db40>] (__irq_svc+0x40/0x74) from [<c000f2dc>] (default_idle+0x34/0x3c)
[ 9247.090304] [<c000f2dc>] (default_idle+0x34/0x3c) from [<c000f694>] (cpu_idle+0xa8/0xf4)
[ 9247.090304] [<c000f694>] (cpu_idle+0xa8/0xf4) from [<c067f558>] (rest_init+0x9c/0xb8)
[ 9247.090304] [<c067f558>] (rest_init+0x9c/0xb8) from [<c095c8a8>] (start_kernel+0x2f4/0x354)
[ 9247.090304] Code: e5853008 e894000c e584c004 e584c000 (e5823004) 
[ 9249.547111] ---[ end trace bc903b5b8c9d2fd4 ]---
[ 9249.560238] Kernel panic - not syncing: Fatal exception in interrupt
[ 9249.575393] CPU3: stopping
[ 9249.585388] [<c0016a20>] (unwind_backtrace+0x0/0xe8) from [<c0687a10>] (dump_stack+0x20/0x24)
[ 9249.585388] [<c0687a10>] (dump_stack+0x20/0x24) from [<c0014170>] (handle_IPI+0x114/0x298)
[ 9249.585388] [<c0014170>] (handle_IPI+0x114/0x298) from [<c0008554>] (gic_handle_irq+0x64/0x6c)
[ 9249.585388] [<c0008554>] (gic_handle_irq+0x64/0x6c) from [<c000db40>] (__irq_svc+0x40/0x74)
[ 9249.585388] Exception stack(0xd58fff68 to 0xd58fffb0)
[ 9249.585388] ff60:                   c1007b38 c09d224c 0000000f 00000000 d58fe000 00000003
[ 9249.585388] ff80: d58fe000 c0a2a2a4 4000406a 410fc075 00000000 d58fffbc d58fffc0 d58fffb0
[ 9249.585388] ffa0: c000f2d8 c000f2dc 60000013 ffffffff
[ 9249.585388] [<c000db40>] (__irq_svc+0x40/0x74) from [<c000f2dc>] (default_idle+0x34/0x3c)
[ 9249.585388] [<c000f2dc>] (default_idle+0x34/0x3c) from [<c000f694>] (cpu_idle+0xa8/0xf4)
[ 9249.585388] [<c000f694>] (cpu_idle+0xa8/0xf4) from [<c068491c>] (secondary_start_kernel+0x108/0x12c)
[ 9249.585388] [<c068491c>] (secondary_start_kernel+0x108/0x12c) from [<40683f34>] (0x40683f34)
[ 9249.585389] CPU2: stopping
[ 9249.585389] [<c0016a20>] (unwind_backtrace+0x0/0xe8) from [<c0687a10>] (dump_stack+0x20/0x24)
[ 9249.585389] [<c0687a10>] (dump_stack+0x20/0x24) from [<c0014170>] (handle_IPI+0x114/0x298)
[ 9249.585389] [<c0014170>] (handle_IPI+0x114/0x298) from [<c0008554>] (gic_handle_irq+0x64/0x6c)
[ 9249.585389] [<c0008554>] (gic_handle_irq+0x64/0x6c) from [<c000db40>] (__irq_svc+0x40/0x74)
[ 9249.585389] Exception stack(0xd58f1f68 to 0xd58f1fb0)
[ 9249.585389] 1f60:                   c0fffb38 c09d224c 0000000f 00000000 d58f0000 00000002
[ 9249.585389] 1f80: d58f0000 c0a2a2a4 4000406a 410fc075 00000000 d58f1fbc d58f1fc0 d58f1fb0
[ 9249.585389] 1fa0: c000f2d8 c000f2dc 60000013 ffffffff
[ 9249.585389] [<c000db40>] (__irq_svc+0x40/0x74) from [<c000f2dc>] (default_idle+0x34/0x3c)
[ 9249.585389] [<c000f2dc>] (default_idle+0x34/0x3c) from [<c000f694>] (cpu_idle+0xa8/0xf4)
[ 9249.585389] [<c000f694>] (cpu_idle+0xa8/0xf4) from [<c068491c>] (secondary_start_kernel+0x108/0x12c)
[ 9249.585389] [<c068491c>] (secondary_start_kernel+0x108/0x12c) from [<40683f34>] (0x40683f34)
[ 9249.585389] CPU1: stopping
[ 9249.585389] [<c0016a20>] (unwind_backtrace+0x0/0xe8) from [<c0687a10>] (dump_stack+0x20/0x24)
[ 9249.585389] [<c0687a10>] (dump_stack+0x20/0x24) from [<c0014170>] (handle_IPI+0x114/0x298)
[ 9249.585389] [<c0014170>] (handle_IPI+0x114/0x298) from [<c0008554>] (gic_handle_irq+0x64/0x6c)
[ 9249.585389] [<c0008554>] (gic_handle_irq+0x64/0x6c) from [<c000db40>] (__irq_svc+0x40/0x74)
[ 9249.585389] Exception stack(0xd58c1f68 to 0xd58c1fb0)
[ 9249.585389] 1f60:                   c0ff7b38 c09d224c 0000000f 00000000 d58c0000 00000001
[ 9249.585389] 1f80: d58c0000 c0a2a2a4 4000406a 410fc075 00000000 d58c1fbc d58c1fc0 d58c1fb0
[ 9249.585389] 1fa0: c000f2d8 c000f2dc 60000013 ffffffff
[ 9249.585389] [<c000db40>] (__irq_svc+0x40/0x74) from [<c000f2dc>] (default_idle+0x34/0x3c)
[ 9249.585389] [<c000f2dc>] (default_idle+0x34/0x3c) from [<c000f694>] (cpu_idle+0xa8/0xf4)
[ 9249.585389] [<c000f694>] (cpu_idle+0xa8/0xf4) from [<c068491c>] (secondary_start_kernel+0x108/0x12c)
[ 9249.585389] [<c068491c>] (secondary_start_kernel+0x108/0x12c) from [<40683f34>] (0x40683f34)
[ 9249.570216] [hotplug]: cpu(0) try to kill cpu(1)
[ 9249.570216] [hotplug]: try to kill cpu:1 failed!
[ 9249.570216] [hotplug]: cpu(0) try to kill cpu(2)
[ 9249.570216] [hotplug]: try to kill cpu:2 failed!
[ 9249.570216] [hotplug]: cpu(0) try to kill cpu(3)
[ 9249.570216] [hotplug]: try to kill cpu:3 failed!
[ 9249.570216] Rebooting in 3 seconds..
[ 9249.570216] Restarting Linux version 3.4.112-sun8i (root@xenial) (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.1) ) #14 SMP PREEMPT Wed Sep 14 20:29:31 CEST 2016
[ 9249.570216]
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DreamDreams

DreamDreams

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Tried 4.9 kernel, doesn't have this problem. 

VPN speed can be stable at about 5.2 MiB/s, one cpu core 100%. 

 

Line speed is 50 Mbit/s, without VPN, cpu load is close to 0 and can achieve line speed. 

 

I use axel with 40 thread to download a 3GB file for test.

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