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
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.
Yours,
Linus Walleij
