Here is flashbench data on Ricoh R5C822 for SanDisk SDSDXP1-016G-A75 16GB
Extreme Pro SDHC Memory Card. Dell XPS 1330M (Ubuntu Natty).
manjo@sleepy:~/Projects/flashbench$ sudo ./flashbench -a /dev/mmcblk0p1
[sudo] password for manjo:
align 4294967296 pre 1.91ms on 1.92ms post 1.92ms
diff 4.46µs
align 2147483648 pre 1.99ms on 1.99ms post 1.99ms
diff -642ns
align 1073741824 pre 1.99ms on 1.99ms post 1.99ms
diff 435ns
align 536870912 pre 1.99ms on 1.99ms post 1.99ms diff
-1003ns
align 268435456 pre 1.99ms on 1.99ms post 1.99ms diff
-283ns
align 134217728 pre 1.99ms on 1.99ms post 1.99ms diff 539ns
align 67108864 pre 1.92ms on 1.91ms post 1.91ms diff 75ns
align 33554432 pre 1.97ms on 2.01ms post 1.97ms diff 41µs
align 16777216 pre 1.98ms on 2.02ms post 1.97ms diff
43.9µs
align 8388608 pre 1.97ms on 1.97ms post 1.98ms diff
-3481ns
align 4194304 pre 2.22ms on 2.39ms post 1.97ms diff 292µs
align 2097152 pre 2.29ms on 2.29ms post 2.3ms diff
-3058ns
align 1048576 pre 2.22ms on 2.22ms post 2.21ms diff 100ns
align 524288 pre 2.22ms on 2.21ms post 2.21ms diff
-728ns
align 262144 pre 2.24ms on 2.24ms post 2.24ms diff
5.13µs
align 131072 pre 2.25ms on 2.24ms post 2.24ms diff 275ns
align 65536 pre 2.23ms on 2.23ms post 2.23ms diff 1.7µs
align 32768 pre 2.24ms on 2.23ms post 2.23ms diff
-2799ns
manjo@sleepy:~/Projects/flashbench$ sudo ./flashbench -O --erasesize=$[4 *
1024 * 1024] --blocksize=$[256 * 1024] /dev/mmcblk0p1 --open-au-nr=2
4MiB 9.96M/s
2MiB 11.2M/s
1MiB 11.2M/s
512KiB 11.2M/s
256KiB 11.2M/s
manjo@sleepy:~/Projects/flashbench$
Hi Manoj,
On Mon, Jul 18 2011, Manoj Iyer wrote:
Right, without the patch I get..
[ 52.526665] mmc0: new SDHC card at address e624
[ 52.571228] mmcblk0: mmc0:e624 SD16G 14.8 GiB
[ 52.591071] mmcblk0: retrying using single block read
[ 52.593105] mmcblk0: error -84 transferring data, sector 0, nr 8,
card status 0x900
[ 52.593109] end_request: I/O error, dev mmcblk0, sector 0
[ 52.594594] mmcblk0: error -84 transferring data, sector 1, nr 7,
card status 0x900
[ 52.594604] end_request: I/O error, dev mmcblk0, sector 1
[ 52.602893] quiet_error: 24 callbacks suppressed
[ 52.602902] Buffer I/O error on device mmcblk0, logical block 0
[ 52.605349] ldm_validate_partition_table(): Disk read failed.
[ 52.605384] Dev mmcblk0: unable to read RDB block 0
[ 52.607729] mmcblk0: unable to read partition table
u@u:~$
So, I cannot generate any comparison data with this SD card.
I see, thanks. So we're lacking any data on what speed the card would
normally provide. Perhaps you could try that card on a different
controller, just so we're able to see whether it's usually possible
to get closer to 45M/sec with it?
I think I'll take your patch as-is for 3.1 -- since if there is a
performance degradation, it's on cards that simply don't work at all
right now -- and if you're able to work on a followup patch that only
performs the clock-lowering after the first error, I think that'd be a
handy patch to have around. Does that sound good?
Thanks!
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
--
====================
Manoj Iyer
Ubuntu/Canonical
Hardware Enablement
====================
