Dan25 Posted November 7, 2016 Posted November 7, 2016 Hey, just wondering if this is a common issue, I've put a fresh copy of Armbian 5.20 (legacy kernel) on my new Evo Plus 64GB and updated it to 5.23 on my Orange Pi PC, but it seems I'm getting only 742KB/s 4k random write speeds (I thought it'd be around 2MB/s) and 5 to 10MB/s sequential write speed. Is this normal, and if so is there a better card to buy that'll give me more Random IO & saturate the write speeds of the bus on the Opi PC? The results from testing /dev/mmcblk0p1 (ext4): Data OK: 55.34 GB (116061392 sectors) Data LOST: 0.00 Byte (0 sectors) Average writing speed: 10.05 MB/s Average reading speed: 20.35 MB/s random random reclen write rewrite read reread read write 4 690 687 4498 4203 4158 742 512 2404 6939 21455 21446 21299 8556 16384 10515 12075 22813 22800 22662 10040 Health summary: OK Performance summary: Sequential reading speed: 20.35 MB/s 4K random reading speed: 4158 KB/s Sequential writing speed: 10.05 MB/s 4K random writing speed: 742 KB/s (too low)
hojnikb Posted November 7, 2016 Posted November 7, 2016 What test did you use ? where did you buy the card ?
tkaiser Posted November 7, 2016 Posted November 7, 2016 Hmm... could you please repeat the test, this time running in one terminal line 1 and in another line 2: cd $HOME ; iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 sudo armbianmonitor -m The armbianmonitor call monitors both cpufreq and should also display %iowait percentage. And cpufreq should remain at 1296 MHz throughout the whole test. Please report back with results.
Dan25 Posted November 8, 2016 Author Posted November 8, 2016 What test did you use ? where did you buy the card ? I used armbianmonitor -c, and the card was bought from an Amazon seller and fulfilled by Amazon. Hmm... could you please repeat the test, this time running in one terminal line 1 and in another line 2: Sure, here are my results: Run began: Tue Nov 8 01:32:38 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 1234 1232 4435 4436 4350 798 102400 16 2710 3777 11686 11717 11554 2504 102400 512 10346 14500 21457 21461 21298 7808 102400 1024 8296 10380 21962 21775 21945 8212 102400 16384 8362 9099 22816 22281 22809 10816 iozone test complete. And CPU stats here: https://ncry.pt/p/xNCn#WmGhevkPANlkni8RZwupGCuoVUaBIQi7-xvQNd5imek
tkaiser Posted November 8, 2016 Posted November 8, 2016 These numbers are clearly bad and do not match every other EVO result from 2016. Would be interesting how mmc info looks like ('sudo armbianmonitor -u')
Dan25 Posted November 8, 2016 Author Posted November 8, 2016 Sure, definitely: http://sprunge.us/cABh I ordered a few Evo 32GB cards for my other OrangePI PC's to see if they'll have better random IO than this card. Will definitely test them before using them though to make sure they are the labeled capacity and perform properly.
tkaiser Posted November 8, 2016 Posted November 8, 2016 Sure, definitely: http://sprunge.us/cABh preferred_erase_size looks suspicious to me (4 times more on all EVO/EVO+ so far). I would test the card also with a fast device and if sequential speeds do not exceed what's guaranteed by specs immediately return it mentioning mmc info and benchmark results.
Dan25 Posted November 8, 2016 Author Posted November 8, 2016 I asked Amazon yesterday about the poor IO performance, they refunded me immediately after telling me that the whole category of PC Accessories doesn't qualify for returns. Told them they were 2 for 4 on bad hardware shipped to me in the last 6 months, and that I'd not be shopping at their new Amazon Fresh store they're opening here in Seattle due to the risk of their supply chain giving me E. coli covered veggies. Should I just plug it into my laptop (i5 w/SSD) via a USB 2.0 dongle and cd into /media/dan/<insert UUID here> and run the same IO test below? iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Edit: So I ran a benchmark from my laptop, seems better in sequential and worse in random IO. Perhaps I'm missing something but I can't find preferred_erase_size, and the microSD is showing up under /sys/block/sda/ and not as /sys/block/mmcblk0/ (my SSD is mounted on sdb). Perhaps its this janky AF 5 in 1 card reader from Frys with an integrated flexy USB cable that is making it mount somewhat oddly? dan@dax:/media/dan/74dab68b-65de-4ecc-b548-e31c5649d68e$ sudo iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Tue Nov 8 04:20:55 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size.random random bkwd record stridekB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread102400 4 4895 4803 7108 7171 2769 538102400 16 9731 10474 13324 13179 8146 2147102400 512 5076 6719 16688 16858 16457 4083102400 1024 5921 6995 16801 16830 16558 4222102400 16384 5445 6909 16610 16661 16618 5060iozone test complete.dan@dax:/media/dan/74dab68b-65de-4ecc-b548-e31c5649d68e$ dateTue Nov 8 04:31:29 PST 2016
tkaiser Posted November 8, 2016 Posted November 8, 2016 Well, it would be good to know whether the card reader is a bottleneck or not. My laptop (MacBook Pro) is able to write/read with +80 MB/s but the only USB card reader I have starts to throttle and/or corrupt data after some time when used with USB3 ports. But you could try it anyway (though not that important since you already got a refund). When your 32 GB EVOs arrive could you please check preferred_erase_size and report back?
Dan25 Posted November 8, 2016 Author Posted November 8, 2016 Will do, where'd preferred_erase_size be when attached via USB on a standard Jessie install? Gonna dig around for another mSD reader here and give that a go.
tkaiser Posted November 8, 2016 Posted November 8, 2016 Sorry, have been wrong here anyway, see link (32 GB EVO used booting OPi Zero): http://forum.armbian.com/index.php/topic/2808-orange-pi-zero-went-to-the-market/page-2#entry19293
Dan25 Posted November 8, 2016 Author Posted November 8, 2016 Huh? I see the mSD card looks like an Evo on post #29 there, but I don't see much other pertinent info... I found 2 other mSD adapters, and a 4 pack of Sandisk mSD cards, benchmarks below. Still don't see any file called preferred_erase_size in /sys, and /sys/block just has sda, sdb & sdc. Evo Plus 64GB: dan@dax:/media/dan/74dab68b-65de-4ecc-b548-e31c5649d68e$ sudo iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2[sudo] password for dan:Iozone: Performance Test of File I/OVersion $Revision: 3.429 $Compiled for 64 bit mode.Build: linux-AMD64Contributors:William Norcott, Don Capps, Isom Crawford, Kirby CollinsAl Slater, Scott Rhine, Mike Wisner, Ken GossSteve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,Vangel Bojaxhi, Ben England, Vikentsi Lapa.Run began: Tue Nov 8 05:54:30 2016Include fsync in write timingO_DIRECT feature enabledAuto ModeFile size set to 102400 kBRecord Size 4 kBRecord Size 16 kBRecord Size 512 kBRecord Size 1024 kBRecord Size 16384 kBCommand line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2Output is in kBytes/secTime Resolution = 0.000001 seconds.Processor cache size set to 1024 kBytes.Processor cache line size set to 32 bytes.File stride size set to 17 * record size.random random bkwd record stridekB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread102400 4 6031 5793 7201 7375 2811 721102400 16 9855 10747 13391 13247 8378 2151102400 512 12682 14293 18856 18988 18647 7694102400 1024 13865 13075 19266 19201 19066 8690102400 16384 14531 12965 19489 19426 19210 13701iozone test complete. Sandisk 16GB: dan@dax:/media/dan/6331-6630$ sudo iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2[sudo] password for dan: Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Tue Nov 8 05:53:43 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 3258 2955 4621 4670 4599 1394 102400 16 7345 7583 11172 11194 11176 1519 102400 512 11302 10935 18943 18903 18986 2584 102400 1024 11124 13174 19405 19462 19326 5025 102400 16384 11693 13015 19560 19489 19551 12140 iozone test complete.
Dan25 Posted November 11, 2016 Author Posted November 11, 2016 So I got 5 of these used Evo 32GB MicroSD cards on eBay, and while 3 of them are hitting 3MB/s in 4k random IO, the other two are pegging in around 800KB/s. Commonalities I noticed are the good ones are made in Korea (part MBMPBGVEDACW-F, 1 tested) & Philippines (part MBMPBGVEODFW-F, 2 tested), and the slow Evo cards were made in the Philippines (part MBMPBGVEDFCW-P, 2 tested). The slow ones passed f3probe, so I'm wondering if its just age/controller failure causing the very poor 4k random IO performance. dan@dax:/media/dan/F295-DC34$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Fri Nov 11 02:38:00 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 1178 1118 3066 3074 3041 829 102400 16 2646 3104 9306 9319 9274 2601 102400 512 7582 9476 18293 18233 18235 5254 102400 1024 6842 7032 18648 18667 18496 5610 102400 16384 6337 7490 18615 18582 18552 7425 iozone test complete.dan@dax:/media/dan/F295-DC34$ cd ..dan@dax:/media/dan$ cd E4DB-2005/dan@dax:/media/dan/E4DB-2005$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Fri Nov 11 02:53:59 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 2989 2872 4616 4616 4688 3061 102400 16 6876 7035 11455 11422 11300 6619 102400 512 13601 15052 19611 19555 19566 13941 102400 1024 15183 14987 19894 19837 19799 14193 102400 16384 14771 14415 19886 20003 19924 16222 iozone test complete.dan@dax:/media/dan/E4DB-2005$ cddan@dax:~$ cd /media/dan/C330-9944/dan@dax:/media/dan/C330-9944$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Fri Nov 11 03:01:24 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 3246 3093 4622 4649 4634 3198 102400 16 9659 10073 11820 11804 11734 11585 102400 512 13283 16536 19202 19354 19249 16880 102400 1024 13084 16275 19774 19786 19751 17199 102400 16384 13803 16599 19698 19769 19719 17202 iozone test complete.dan@dax:/media/dan/C330-9944$ cd ..dan@dax:/media/dan$ cd A1D0-A2BC/`> ^Cdan@dax:/media/dan$ cd A1D0-A2BC/dan@dax:/media/dan/A1D0-A2BC$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Fri Nov 11 03:09:58 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 1261 1284 3138 3118 3112 879 102400 16 4105 3747 9517 9437 9226 2988 102400 512 8224 9875 18186 18182 18157 5096 102400 1024 6585 8227 18711 18681 18575 5670 102400 16384 6427 7372 18647 18652 18559 6298 iozone test complete.dan@dax:/media/dan/A1D0-A2BC$ cd ..dan@dax:/media/dan$ cd89AF-51A0/dan@dax:/media/dan$ cd 89AF-51A0/dan@dax:/media/dan/89AF-51A0$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Iozone: Performance Test of File I/O Version $Revision: 3.429 $ Compiled for 64 bit mode. Build: linux-AMD64 Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root, Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer, Vangel Bojaxhi, Ben England, Vikentsi Lapa. Run began: Fri Nov 11 03:22:58 2016 Include fsync in write timing O_DIRECT feature enabled Auto Mode File size set to 102400 kB Record Size 4 kB Record Size 16 kB Record Size 512 kB Record Size 1024 kB Record Size 16384 kB Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2 Output is in kBytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 kBytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride kB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 102400 4 3168 3087 4639 4650 4600 3193 102400 16 9747 10092 11438 11360 11411 11824 102400 512 11770 17038 19529 19614 19580 16946 102400 1024 13076 16323 19769 19794 19634 17186 102400 16384 13749 16595 19827 19825 19811 17127 iozone test complete. f3probe results for the 2 slow cards: dan@dax:~/Downloads/f3-6.0$ sudo ./f3probe --destructive --time-ops /dev/sdaF3 probe 6.0Copyright © 2010 Digirati Internet LTDA.This is free software; see the source for copying conditions.WARNING: Probing normally takes from a few seconds to 15 minutes, but it can take longer. Please be patient.Good news: The device `/dev/sda' is the real thingDevice geometry: *Usable* size: 29.83 GB (62552064 blocks) Announced size: 29.83 GB (62552064 blocks) Module: 32.00 GB (2^35 Bytes) Approximate cache size: 0.00 Byte (0 blocks), need-reset=no Physical block size: 512.00 Byte (2^9 Bytes)Probe time: 4'02" Operation: total time / count = avg time Read: 1.12s / 4815 = 234us Write: 3'58" / 4192321 = 56us Reset: 736.5ms / 1 = 736.5msdan@dax:~/Downloads/f3-6.0$ sudo ./f3probe --destructive --time-ops /dev/sdaF3 probe 6.0Copyright © 2010 Digirati Internet LTDA.This is free software; see the source for copying conditions.WARNING: Probing normally takes from a few seconds to 15 minutes, but it can take longer. Please be patient.Good news: The device `/dev/sda' is the real thingDevice geometry: *Usable* size: 29.83 GB (62552064 blocks) Announced size: 29.83 GB (62552064 blocks) Module: 32.00 GB (2^35 Bytes) Approximate cache size: 0.00 Byte (0 blocks), need-reset=no Physical block size: 512.00 Byte (2^9 Bytes)Probe time: 4'02" Operation: total time / count = avg time Read: 1.43s / 4815 = 298us Write: 3'58" / 4192321 = 56us Reset: 393.2ms / 1 = 393.2ms
hojnikb Posted November 11, 2016 Posted November 11, 2016 Maybe it's a different controller alltogether or tuned for sequential performance rather than random.
Dan25 Posted November 11, 2016 Author Posted November 11, 2016 Eh, I'd hope it'd perform better, cause the slow cards seem to top out at 6MB/s therefore they don't meet the class 10 rating stamped on the card.
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