Chris,
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.
On Mon, 18 Jul 2011, Chris Ball wrote:
Hi Manoj,
On Mon, Jul 18 2011, Manoj Iyer wrote:
Here are the results with SanDisk SDSDXP1-016G-A75 16GB Extreme Pro
SDHC Memory Card.
u@u:~/flashbench$ sudo ./flashbench -a /dev/mmcblk0p1
[sudo] password for u:
align 4294967296 pre 1.16ms on 1.15ms post 1.15ms
diff -2024ns
align 2147483648 pre 1.2ms on 1.2ms post 1.2ms
diff 522ns
align 1073741824 pre 1.21ms on 1.2ms post 1.2ms
diff 570ns
align 536870912 pre 1.2ms on 1.2ms post 1.2ms diff 662ns
align 268435456 pre 1.2ms on 1.2ms post 1.2ms diff 404ns
align 134217728 pre 1.2ms on 1.2ms post 1.2ms diff
-1692ns
align 67108864 pre 1.15ms on 1.16ms post 1.16ms diff
1.37µs
align 33554432 pre 1.18ms on 1.19ms post 1.15ms diff
31.3µs
align 16777216 pre 1.17ms on 1.19ms post 1.15ms diff
31.5µs
align 8388608 pre 1.17ms on 1.21ms post 1.18ms diff
32.9µs
align 4194304 pre 1.37ms on 1.55ms post 1.17ms diff 274µs
align 2097152 pre 1.37ms on 1.37ms post 1.39ms diff
-7992ns
align 1048576 pre 1.33ms on 1.33ms post 1.34ms diff
-7793ns
align 524288 pre 1.33ms on 1.33ms post 1.34ms diff
-6641ns
align 262144 pre 1.34ms on 1.38ms post 1.35ms diff
33.8µs
align 131072 pre 1.35ms on 1.37ms post 1.34ms diff
27.2µs
align 65536 pre 1.34ms on 1.37ms post 1.34ms diff
31.7µs
align 32768 pre 1.33ms on 1.37ms post 1.34ms diff
32.5µs
u@u:~/flashbench$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024]
--blocksize=$[256 * 1024] /dev/mmcblk0p1 --open-au-nr=2
4MiB 23.2M/s
2MiB 23.6M/s
1MiB 23.5M/s
512KiB 23.2M/s
256KiB 23.2M/s
u@u:~/flashbench$
I don't understand whether these measurements are before or after your
patch -- we're looking to see what the *difference* in performance is
with the patch applied, right?
Thanks,
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
--
====================
Manoj Iyer
Ubuntu/Canonical
Hardware Enablement
====================
