Hi Olliver,
Unfortunately, I have a problem to see and use quoted text so I delete it.
I saw broken-hpi option but currently I use mainly kernel 4.5.3 so not sure
if it is available there.
About 8-bit staff in my patch it is there by error. I really use 4-bit bus
without additional pins definitions.
About better results measured by you it is definitely because of larger
buffers.
If you want to get a real figures you have to measure performance for a set
of buffer sizes like I do with iozone tool:
root@egpr:~# uname -a
Linux egpr 4.6.0-sunxi #1 SMP Tue May 10 20:50:21 EEST 2016 armv7l GNU/Linux
root@egpr:/mnt# 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 32 bit mode.
Build: linux
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 May 10 23:28:08 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
kB reclen write rewrite read reread read
write
102400 4 3653 4003 12637 12521 9501
3997
102400 16 7277 7531 16300 16413 14910
7392
102400 512 11733 11739 39496 39444 39254
11718
102400 1024 11793 11843 40015 40086 39951
11887
102400 16384 11977 11895 40680 40781 40656
11952
random
random
kB reclen write rewrite read reread read
write
102400 4 3768 4008 12458 12432 9565
3895
102400 16 7231 7526 16488 16634 15085
7432
102400 512 11608 11700 38424 38358 38172
11655
102400 1024 11841 11853 39543 39736 39573
10977
102400 16384 11923 11950 40756 40823 40824
11994
iozone test complete.
It is strange that read speed of ~40 MB/s is reached at 512+ kB buffers but
write speed of 17MB/s (as you mention) is never reached at my tests.
For reference iozone test gives eMMC speeds at kernel 4.5.3:
random
random
kB reclen write rewrite read reread read
write
102400 4 3444 3677 9663 9626 7801
3577
102400 16 6290 6514 13084 12740 11873
6409
102400 512 11623 11653 21592 21567 21485
10617
102400 1024 11787 11859 21862 21907 21811
11805
102400 16384 11944 11914 22131 22125 22147
11947
4GB SD card class 10 speeds at kernel 4.6.0 are:
random
random
kB reclen write rewrite read reread read
write
102400 4 630 736 5242 5149 4683
171
102400 16 1140 1507 11630 11651 11517
331
102400 512 6247 6465 21572 20748 21567
945
102400 1024 6297 6521 20707 21943 21901
1945
102400 16384 6363 6416 22209 21001 22208
6459
4GB SD card class 10 speeds at kernel 4.5.3 are:
random
random
kB reclen write rewrite read reread read
write
102400 4 222 227 5790 5821 4180
203
102400 16 5681 6149 9470 9661 8340
62
102400 512 12033 11656 21194 21194 20982
2199
102400 1024 12548 11792 21606 21616 20760
4737
102400 16384 12755 11831 21929 21964 21214
10531
Strange is that SD card write speed is better at kernel 4.5.3 than at
kernel 4.6.0 while read speed is almost the same.
About using your patch in kernel 4.6 at Armbian build I did not see any
errors at patching phase.
Maybe I have to try patched with my patches u-boot and kernel 4.6 patched
with your patch.
But I am not sure that u-boot has to do something for kernel to work with
eMMC.
I am ready to test if you have some ideas because your patch is probably
better than one used by me at the moment.
Best regards
Chris
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