On Thursday, August 09, 2012 2:06 PM, Tanya Brokhman <tlin...@codeaurora.org>
wrote:
Thank you for interesting patch.
Here is other test result.
* Test environment
kernel version: 3.4
Underline device driver: mmc
Host controller: dw_mmc
Card:standard emmc NAND flash
* lmdd with parallel read and write
/data/lmdd if=internal of=/data/writefile bs=128k count=3000
/data/lmdd if=/data/readfile of=internal bs=128k count=3000
READ WRITE
CFQ 37MB 23MB
ROW 41MB 23MB
* iozone with parallel read and write
/data/iozone -i0 -r4096k -s200m -I -e -w -f/data/write
/data/iozone -i1 -r4096k -s200m -I -e -f/data/read
READ WRITE
CFQ 23MB 24MB
ROW 40MB 17MB
Results show that read throughput of ROW is better than CFQ.
However, write throughput is degraded in case of IOZONE test.
Depending on user scenario, write can be considered to be important.
It needs to check the starvation of write.
Thanks,
Seungwon Jeon
> Hi Chung
>
>
> > The below is my environment:
> > Kernel Version: linux-3.4
> > Card: eMMC4.5 (50MHz DDR mode, 8-bit buswidth) Host controller : dw-
> > mmc (DesignWare MMC controller) Benchmark : IOzone
> >
> > *CFQ Scheduler
> > Read : 35MB
> > Write : 17MB
> >
> > *ROW Scheduler
> > Read : 28MB
> > Write : 17MB
> >
> > How do you think about this result?
> >
>
> I run your cmd of iozone on my setup and got a bit different results:
> CFQ scheduler:
> 204800 16384 27903 27248 40345 40399
> READ: 40 MB/sec WRITE: 27 MB/sec
>
> ROW scheduler:
> READ: 39.6 MB/sec WRITE: 27MB/sec
>
> As you can see the results are the same for both schedulers.
> Anyway, the improvement added by ROW is in scenario of parallel read and
> write, which iozone doesn't
> do so running iozone for comparing ROW to CFQ is useless.
> If it's not too difficult I would appreciate if you could run the bellow 2
> commands simultaneously on
> your setup:
> adb shell /data/lmdd if=internal of=/data/writefile bs=128k count=3000
> adb shell /data/lmdd if=/data/readfile of=internal bs=128k count=3000
> You'll see an improvement in throughput when using ROW over CFQ.
> We have a patch that also measures latency and we saw that read latency was
> also improved greatly when
> using ROW.
>
>
> Thanks,
> Tanya Brokhman
> ---
> Sent by an consultant of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
>
>
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