On 08/08/2012 07:37 PM, Tanya Brokhman wrote: > Hi Chung > >> Hi >> >> I tested with this patch on my board. >> But i didn't get any performance benefit. >> Which benchmark did you use? > > As I already mentioned I used lmdd. The results I published were collected using the bellow command run in parallel: > 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 > > With lmdd we did see great improvement both in throughput and in read latency: > CFQ: READ 20.81 MB/sec, WRITE 15.23 MB/sec Worst case READ latency 230 msec Worst case write latency 9370 msec > ROW: READ 27.75 MB/sec WRITE 15.34 MB/sec Worst case READ latency 85 msec Worst case write latency 12025 msec > > ROW can be configured to perform at ~34 MB/sec throughput in the above scenario but in this configuration worst case write latency increases to ~13 sec. I will try to test with lmdd. > >> And sometime this scheduler didn't work well read/write operation. >> (i didn't know exactly what problem.) > > This may be. We're still working on testing the scheduler and improving it. It's not yet totally "bug free". I've uploaded the code as RFC. > >> >> 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 >> > > My environment is similar except the host controller which is msm-sdcc. > Could you please give me the exact iozone command you used? I'll replay it on my setup. iozone -A -s 200m -U /data/ -f /data/test -e and iozone -A -s 200m -f /data/test -e -I Best Regards, Jaehoon Chung > > 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
