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. > 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. 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
