Hi, i will try the test with your comment. and will share the result. Thanks for reply. Best Regards, Jaehoon Chung 2012/8/9 Tanya Brokhman <tlinder@xxxxxxxxxxxxxx>: > 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. > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
