gahabana Posted October 16, 2017 Posted October 16, 2017 hi all, as mainline kernel options for Odroid-C2 are still not ready (USB not recognising DAC unless externall HDD connected during boot) .. have just switched back to 'default' build. I noticed system to be much slower then usual .... esp. when involving any writes. SD-Card is Sandisk 16GB and is working very well in OdroidXU4 and NanoPi NEO. When copying a few 100kB file takes few seconds: time cp /usr/bin/ssh ~/ ; time sync real 0m0.012s user 0m0.000s sys 0m0.010s real 0m2.982s user 0m0.000s sys 0m0.010s I tried with 'dd' command to see how fast simple writes are going and got at best 200kB/sec .... Does anyone have suggestions what to do ? Armbian is : ARMBIAN 5.33 user-built Ubuntu 16.04.3 LTS 3.14.79-odroidc2 ... no kernel modifications : zh@odroidc2's password: ___ _ _ _ ____ ____ / _ \ __| |_ __ ___ (_) __| | / ___|___ \ | | | |/ _` | '__/ _ \| |/ _` | | | __) | | |_| | (_| | | | (_) | | (_| | | |___ / __/ \___/ \__,_|_| \___/|_|\__,_| \____|_____| Welcome to ARMBIAN 5.33 user-built Ubuntu 16.04.3 LTS 3.14.79-odroidc2 System load: 0.83 0.35 0.16 Up time: 21:20 hours Memory usage: 10 % of 1718MB IP: 192.168.1.99 CPU temp: 37°C Usage of /: 10% of 15G [ General system configuration: armbian-config ] Last login: Mon Oct 16 06:35:37 2017 from 192.168.1.62 zh@odroidc2:~$ dd if=/dev/zero of=~/testfile bs=10M count=1 oflag=direct 1+0 records in 1+0 records out 10485760 bytes (10 MB, 10 MiB) copied, 51.8837 s, 202 kB/s zh@odroidc2:~$ dd if=/dev/zero of=~/testfile bs=10M count=1 oflag=direct 1+0 records in 1+0 records out 10485760 bytes (10 MB, 10 MiB) copied, 17.0363 s, 615 kB/s zh@odroidc2:~$ dd if=/dev/zero of=~/testfile bs=4K count=2 oflag=direct 2+0 records in 2+0 records out 8192 bytes (8.2 kB, 8.0 KiB) copied, 0.414244 s, 19.8 kB/s zh@odroidc2:~$ dd if=/dev/zero of=~/testfile bs=4K count=100 oflag=direct 100+0 records in 100+0 records out 409600 bytes (410 kB, 400 KiB) copied, 20.2592 s, 20.2 kB/s
tkaiser Posted October 16, 2017 Posted October 16, 2017 23 minutes ago, gahabana said: SD-Card is Sandisk 16GB and is working very well in OdroidXU4 and NanoPi NEO Had worked or is working? If you claim it is working very well there too then please show us performance numbers made now on these other boards. Otherwise moving the thread to https://forum.armbian.com/index.php?/forum/31-sd-card-and-power-supply/ would be a good idea.
gahabana Posted October 16, 2017 Author Posted October 16, 2017 hi, here are the performance numbers using same sd-card now in an Intel PC (via USB 3.0 SDcard adapter). I do get sometimes 15MB/sec ... most of the time 10-13MB/s ... which is lot more then in the Odroid-C2 is there any other known setting ... i saw that armhwinfo service changed io-schedule to noop ... but that should be perfect one for SD cards so am not sure what else to look into ? thank you !!! zh@smc:/media/sdcard$ uname -a Linux smc 4.10.0-37-generic #41~16.04.1-Ubuntu SMP Fri Oct 6 22:42:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux zh@smc:/media/sdcard$ dd if=/dev/zero of=./testfile bs=10M count=1 oflag=direct; time sync 1+0 records in 1+0 records out 10485760 bytes (10 MB, 10 MiB) copied, 0.907064 s, 11.6 MB/s real 0m0.080s user 0m0.000s sys 0m0.000s zh@smc:/media/sdcard$ dd if=/dev/zero of=./testfile bs=10M count=1 oflag=direct; time sync 1+0 records in 1+0 records out 10485760 bytes (10 MB, 10 MiB) copied, 0.936801 s, 11.2 MB/s real 0m0.164s user 0m0.000s sys 0m0.000s zh@smc:/media/sdcard$ dd if=/dev/zero of=./testfile bs=1M count=1 oflag=direct; time sync 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0769396 s, 13.6 MB/s real 0m0.066s user 0m0.004s sys 0m0.000s zh@smc:/media/sdcard$ dd if=/dev/zero of=./testfile bs=1M count=1 oflag=direct; time sync 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0821423 s, 12.8 MB/s real 0m0.060s user 0m0.000s sys 0m0.000s
tkaiser Posted October 16, 2017 Posted October 16, 2017 6 hours ago, gahabana said: so am not sure what else to look into ? https://forum.openmediavault.org/index.php/Thread/17855-Building-OMV-automatically-for-a-bunch-of-different-ARM-dev-boards/?postID=153760#post153760 ODROID C2 booting with exactly this kernel version. Check the sprunge.us link and there the 'quick iozone test' line. Almost 8MB/s read and almost 3MB/s write with 4K blocksize while booting -- there should be nothing wrong with this kernel and I would check contacts in the SD card slot and dmesg output for SDIO errors and stuff like that first.
gahabana Posted October 19, 2017 Author Posted October 19, 2017 hi @tkaiser, look i don't know ... it is really weird. Bought a new SD-Card ... burn same armbian image to it ... to both (both are 16GB SanDisk) ... old one is slow (<1MB/sec) and new one is just fine (10-20MB/sec). Old one works fine on a PC but not in OdroidC2. New one of course works well on both. So the only conclusion i have - old one works not so well with -next/-dev kernels (though no errors in the kernel log) ... am too lazy to try with -default (3.14) kernel ... but guess card is somewhat 'kaput' ;(
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