Hi Eric
G'day
This is still present, and we have absolutely no idea where to
continue
searching for the solution of the problem. Any pointers? Any git
trees
of mmc driver changes we could try? Anybody else with a MX25 that
has
this issue?
does that attached patch fix your problem ?
YES, indeed it does to a certain degree. The timeout errors do not
occur anymore and I can successfully perform many fs->ops, such as READ,
WRITE, UNLINK ... . So thank you very much for this insight through your
patch!
The speed of the card is excruciatingly slow, however. We roughly get
between 34KB/s and 64KB/s from a dd if=/dev/zero write to any of the
following partitions:
root@mx25-noah:~$> grep mmc /proc/mounts
/dev/mmcblk0p2 /media/card-ext3 ext3
rw,sync,relatime,user_xattr,barrier=1,nodelalloc,data=ordered 0 0
/dev/mmcblk0p1 /media/card vfat
rw,sync,relatime,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro
0 0
root@mx25-noah:~$> df -kh | grep mmc
/dev/mmcblk0p2 1.7G 133.1M 1.5G 8%
/media/card-ext3
/dev/mmcblk0p1 123.6M 2.7M 120.9M 2% /media/card
root@mx25-noah:~$> dd if=/dev/zero of=/media/card/test-10M bs=1024K
count=10
10+0 records in
10+0 records out
10485760 bytes (10.0MB) copied, 296.004564 seconds, 34.6KB/s
root@mx25-noah:~$> dd if=/dev/zero of=/media/card-ext3/test-10M
bs=1024K count=10
10+0 records in
10+0 records out
10485760 bytes (10.0MB) copied, 158.207481 seconds, 64.7KB/s
What's going on here, why is it so slow?
root@mx25-noah:~$> dmesg | grep -A1 CMD24
[ 635.195042] mmc0: starting CMD24 arg 0e5c1600 flags 000000b5
[ 635.195081] mmc0: blksz 512 blocks 1 flags 00000100 tsac 300 ms
nsac 0
--
[ 635.199831] mmc0: req done (CMD24): 0: 00000900 00000000 00000000
00000000
[ 635.199866] mmc0: 512 bytes transferred: 0
--
[ 635.200212] mmc0: starting CMD24 arg 0e5c1800 flags 000000b5
[ 635.200251] mmc0: blksz 512 blocks 1 flags 00000100 tsac 300 ms
nsac 0
--
[ 635.206516] mmc0: req done (CMD24): 0: 00000900 00000000 00000000
00000000
[ 635.206549] mmc0: 512 bytes transferred: 0
--
[ 635.206892] mmc0: starting CMD24 arg 0e5c1a00 flags 000000b5
[ 635.206932] mmc0: blksz 512 blocks 1 flags 00000100 tsac 300 ms
nsac 0
--
[ 635.211763] mmc0: req done (CMD24): 0: 00000900 00000000 00000000
00000000
[ 635.211796] mmc0: 512 bytes transferred: 0
--
[ 635.212409] mmc0: starting CMD24 arg 0e5c1c00 flags 000000b5
[ 635.212449] mmc0: blksz 512 blocks 1 flags 00000100 tsac 300 ms
nsac 0
Also, debugfs values don't make sense to me:
root@mx25-noah:/sys/kernel/debug/mmc0$> cat clock
50000000
root@mx25-noah:/sys/kernel/debug/mmc0$> cat ios
clock: 50000000 Hz
vdd: 17 (2.9 ~ 3.0 V)
bus mode: 2 (push-pull)
chip select: 0 (don't care)
power mode: 2 (on)
bus width: 2 (4 bits)
timing spec: 2 (sd high-speed)
root@mx25-noah:/sys/kernel/debug/mmc0$> cat mmc0\:0002/stat
state status
root@mx25-noah:/sys/kernel/debug/mmc0$> cat mmc0\:0002/state
0x00000005
root@mx25-noah:/sys/kernel/debug/mmc0$> cat mmc0\:0002/status
00000900
Best regards and thank you so much for this real improvement of our
situation here.
--
Joan C. Abelaira
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