Re: [PATCH] mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency

From: Chris Ball
Date: Mon Jul 18 2011 - 16:40:53 EST


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
> 1.37Âs
> align 33554432 pre 1.18ms on 1.19ms post 1.15ms diff
> 31.3Âs
> align 16777216 pre 1.17ms on 1.19ms post 1.15ms diff
> 31.5Âs
> align 8388608 pre 1.17ms on 1.21ms post 1.18ms diff
> 32.9Âs
> align 4194304 pre 1.37ms on 1.55ms post 1.17ms diff 274Âs
> 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
> 33.8Âs
> align 131072 pre 1.35ms on 1.37ms post 1.34ms diff
> 27.2Âs
> align 65536 pre 1.34ms on 1.37ms post 1.34ms diff
> 31.7Âs
> align 32768 pre 1.33ms on 1.37ms post 1.34ms diff
> 32.5Âs
>
> 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
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