Hi Linus, On 2017/2/17 17:33, Linus Walleij wrote: > This week I tested the following: > > - Merge the in-flight BFQ work from Paolo with my MMC MQ patch set > - Enable BFQ > - Run a few iterations of classic throughput tests > > dd on whole internal eMMC, 7.38 GiB: > > sync > echo 3 > /proc/sys/vm/drop_caches > sync > time dd if=/dev/mmcblk3 of=/dev/null > time dd if=/dev/mmcblk3 of=/dev/null bs=1M > > iozone on a Noname SD card 2GB > > mount /dev/mmcblk0p1 /mnt > sync > echo 3 > /proc/sys/vm/drop_caches > sync > iozone -az -i0 -i1 -i2 -s 20m -I -f /mnt/foo.test > > The results: > > Before patches (v4.10-rc8): > > 7918845952 bytes (7.4GB) copied, 194.504059 seconds, 38.8MB/s > real 3m 14.51s > user 0m 7.41s > sys 1m 10.34s > > 7918845952 bytes (7.4GB) copied, 176.519531 seconds, 42.8MB/s > real 2m 56.53s > user 0m 0.06s > sys 0m 36.57s > > Command line used: iozone -az -i0 -i1 -i2 -s 20m -I -f /mnt/foo.test > Output is in kBytes/sec > > random random > kB reclen write rewrite read reread read write > 20480 4 1960 2105 5991 6023 5202 40 > 20480 8 4636 4901 9087 9103 9066 80 > 20480 16 5522 5663 12237 12242 12206 163 > 20480 32 5976 6031 14915 14917 14901 333 > 20480 64 6286 6387 16737 16763 16738 678 > 20480 128 6720 6757 17876 17857 17865 1403 > 20480 256 6846 6909 18230 17568 16719 3039 > 20480 512 7204 7229 18471 18751 18834 7209 > 20480 1024 7257 7315 18684 18044 18095 7337 > 20480 2048 7322 7388 18605 18802 19437 7401 > 20480 4096 7553 7652 21510 21108 21503 7688 > 20480 8192 7534 7745 22164 22300 22490 7758 > 20480 16384 7357 7818 23053 23048 23056 7834 > > > After MMC MQ patches: > > 7918845952 bytes (7.4GB) copied, 196.907776 seconds, 38.4MB/s > real 3m 16.91s > user 0m 7.17s > sys 1m 8.03s > > 7918845952 bytes (7.4GB) copied, 192.595734 seconds, 39.2MB/s > real 3m 12.60s > user 0m 0.12s > sys 0m 33.11s > > Command line used: iozone -az -i0 -i1 -i2 -s 20m -I -f /mnt/foo.test > random random > kB reclen write rewrite read reread read write > 20480 4 2049 2154 5991 5998 5934 40 > 20480 8 4654 4921 9081 9075 9028 81 > 20480 16 5572 5747 12250 12252 12177 164 > 20480 32 6040 6084 14858 14895 14833 335 > 20480 64 6370 6449 16759 16770 16715 682 > 20480 128 6834 6814 17882 17843 17878 1411 > 20480 256 6892 6900 18526 18105 18430 3066 > 20480 512 7239 7254 18839 18864 18837 7258 > 20480 1024 7342 6453 18787 18161 17522 7343 > 20480 2048 7408 7439 17891 18211 19029 7472 > 20480 4096 7641 7703 20950 21044 20900 7705 > 20480 8192 7584 7811 22261 22170 22385 7809 > 20480 16384 7407 7873 23033 23050 23048 7905 > > > After MMC MQ+BFQ patches: > > 7918845952 bytes (7.4GB) copied, 197.097717 seconds, 38.3MB/s > real 3m 17.10s > user 0m 7.67s > sys 1m 7.33s > > 7552+0 records in > 7552+0 records out > 7918845952 bytes (7.4GB) copied, 187.119538 seconds, 40.4MB/s > real 3m 7.12s > user 0m 0.11s > sys 0m 34.61s > > Command line used: iozone -az -i0 -i1 -i2 -s 20m -I -f /mnt/foo.test > Output is in kBytes/sec > random random > kB reclen write rewrite read reread read write > 20480 4 1734 1786 5923 5166 5894 40 > 20480 8 4614 4853 8950 8949 8909 80 > 20480 16 5525 5705 12086 12098 12040 164 > 20480 32 6027 6040 14765 14793 14755 334 > 20480 64 6341 6404 16696 16697 16670 680 > 20480 128 6799 6842 17830 17833 17814 1407 > 20480 256 6848 6849 17394 18251 17537 3054 > 20480 512 7191 7229 18545 18628 18801 7224 > 20480 1024 7241 7331 17845 17909 18206 7302 > 20480 2048 7375 7433 18794 19288 19675 7426 > 20480 4096 7583 7696 21024 21194 21082 7659 > 20480 8192 7555 7767 22068 22170 22168 7808 > 20480 16384 7350 7831 23021 23032 23050 7870 > I would like to suggest that you should try the multiple thread test mode of iozone, since you are testing *Multi* Queue. Besides, it seems that your eMMC transfer speed is quite low. It is normal that read speed can reach more than 100MB/s in HS400. Could you try a higher speed mode? The test result might be limited by the bus clock frequency. > > As you can see there are no huge performance regressions with these > kinds of "raw" throughput tests. > > These iozone figures are unintuitive unless your head can > plot logarithmic, look at the charts here for a more visual presentation > of the iozone results: > https://docs.google.com/spreadsheets/d/1rm72TiGlTnzDeGLR__aqvjcJ2UkA-Ro3-XyKA8r1M-c > > Compare this to the performance change we got when first introducing > the asynchronous requests: > https://wiki.linaro.org/WorkingGroups/KernelArchived/Specs/StoragePerfMMC-async-req > > The patches need some issues fixed from the build server > complaints and some robustness hammering, but after that I > think they will be ripe for merging for v4.12. > Actually I have been following your thread for some time. But currently I'm a little confused. May I know the purpose of your patch? Thank you. Best regards, Hu Ziji > Yours, > Linus Walleij > -- > 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 >
