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SubjectRe: [RFC PATCH] cfq-iosced: Implement IOPS mode and group_idle tunable V3
On Mon, Jul 26, 2010 at 02:58:16PM +0800, Gui Jianfeng wrote:

[..]
> Hi Vivek,
>
> I did some tests on single SATA disk on my desktop. With patches applied, seems no
> regression occurs till now, and have some performance improvement in case of
> "Direct Random Reader" mode. Here're some numbers on my box.
>

Thanks for testing Gui. "iostest" seems to be working for you. If you had
to some fixes to make it work on my boxes, do send those to me, and I can
commit those in my internal git tree.

After running the script, you can also run "iostest -R <result-dir>" and
that will generate a report. It will not have all this "Starting test..."
lines and looks nicer.

Good to know that you don't see any regressions on SATA disk in your
cgroup testing with this patchset. Little improvement in "drr" might
be due to the fact that with existing slice_idle=0, we can still do
some extra idling on service tree and first patch in the series (V4)
gets rid of that.

Thanks
Vivek

> Vallina kernel:
>
> Blkio is already mounted at /cgroup/blkio. Unmounting it
> DIR=/mnt/iostestmnt/fio DEV=/dev/sdb2
> GROUPMODE=1 NRGRP=4
> Will run workloads for increasing number of threads upto a max of 4
> Starting test for [drr] with set=1 numjobs=1 filesz=512M bs=32k runtime=30
> Starting test for [drr] with set=1 numjobs=2 filesz=512M bs=32k runtime=30
> Starting test for [drr] with set=1 numjobs=4 filesz=512M bs=32k runtime=30
> Finished test for workload [drr]
> Host=localhost.localdomain Kernel=2.6.35-rc4-Vivek-+
> GROUPMODE=1 NRGRP=4
> DIR=/mnt/iostestmnt/fio DEV=/dev/sdb2
> Workload=drr iosched=cfq Filesz=512M bs=32k
> group_isolation=1 slice_idle=0 group_idle=8 quantum=8
> =========================================================================
> AVERAGE[drr] [bw in KB/s]
> -------
> job Set NR cgrp1 cgrp2 cgrp3 cgrp4 total
> --- --- -- -----------------------------------
> drr 1 1 761 761 762 760 3044
> drr 1 2 185 420 727 1256 2588
> drr 1 4 180 371 588 863 2002
>
>
> Patched kernel:
>
> Blkio is already mounted at /cgroup/blkio. Unmounting it
> DIR=/mnt/iostestmnt/fio DEV=/dev/sdb2
> GROUPMODE=1 NRGRP=4
> Will run workloads for increasing number of threads upto a max of 4
> Starting test for [drr] with set=1 numjobs=1 filesz=512M bs=32k runtime=30
> Starting test for [drr] with set=1 numjobs=2 filesz=512M bs=32k runtime=30
> Starting test for [drr] with set=1 numjobs=4 filesz=512M bs=32k runtime=30
> Finished test for workload [drr]
> Host=localhost.localdomain Kernel=2.6.35-rc4-Vivek-+
> GROUPMODE=1 NRGRP=4
> DIR=/mnt/iostestmnt/fio DEV=/dev/sdb2
> Workload=drr iosched=cfq Filesz=512M bs=32k
> group_isolation=1 slice_idle=0 group_idle=8 quantum=8
> =========================================================================
> AVERAGE[drr] [bw in KB/s]
> -------
> job Set NR cgrp1 cgrp2 cgrp3 cgrp4 total
> --- --- -- -----------------------------------
> drr 1 1 323 671 1030 1378 3402
> drr 1 2 165 391 686 1144 2386
> drr 1 4 185 373 612 873 2043
>
> Thanks
> Gui
>
> >
> > Thanks
> > Vivek
> >


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