* Re: 2.6.4-mm2
[not found] ` <20040319183906.I8594@osdlab.pdx.osdl.net>
@ 2004-03-22 17:19 ` Mary Edie Meredith
2004-03-23 0:27 ` 2.6.4-mm2 Andrew Morton
0 siblings, 1 reply; 6+ messages in thread
From: Mary Edie Meredith @ 2004-03-22 17:19 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-kernel, linux-mm
[was "Poor DBT-3 pgsql 8way numbers on recent 2.6 mm kernels" on
linux-mm]
Andrew,
This same patch (02) applied in STP (plm 2780) when run against
dbt3-pgsql DSS workload displays the performance problem with the
throughput numbers that I reported on linux-mm on our 8way systems,
where the previous patch (plm 2777 -01) does not.
Here is the data (patches applied to 2.6.5-rc1)
PLM.....CPUs.Runid..Thruput Metric (bigger is better)
2777(01) 8 290298 138.22 (base )
2779(02) 8 290304 88.57 (-35.9%)
The 8way is a 700MHz (1024k processor cache) with 8GB of memory.
Original message on linux-mm:
http://marc.theaimsgroup.com/?l=linux-mm&m=107913089923436&w=2
Results from runid 290298 (the good result);
http://khack.osdl.org/stp/290298/ (top level)
Results from runid 290304 (the bad result):
http://khack.osdl.org/stp/290305/ (top level)
For sar results see "Raw data" section everything labeled as
"thruput.sar."
http://khack.osdl.org/stp/290305/profile/after_throughput_test_1-tick.top20 (profile of throughput phase of the test)
http://khack.osdl.org/stp/290305/results/plot/thuput.vmstat.txt
(vmstat of thoughput phase of the test)
On Fri, 2004-03-19 at 18:39, Mark Wong wrote:
> On Thu, Mar 18, 2004 at 07:41:50PM -0800, Andrew Morton wrote:
> > Andrew Morton <akpm@osdl.org> wrote:
> > >
> > > Mark, if it's OK I'll run up some kernels for you to test.
> >
> > At
> >
> > http://www.zip.com.au/~akpm/linux/patches/markw/
>
> Ok, looks like I take the first hit with the 02 patch. Here's re-summary:
>
> kernel 16 kb 32 kb 64 kb 128 kb 256 kb 512 kb
> 2.6.3 2308 2335 2348 2334
> 2.6.4-mm2 2028 2048 2074 2096 2082 2078
> 2.6.5-rc1-01 2394
> 2.6.5-rc1-02 2117
> 2.6.5-rc1-mm2 2036
> -
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--
Mary Edie Meredith
maryedie@osdl.org
503-626-2455 x42
Open Source Development Labs
--
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.4-mm2
2004-03-22 17:19 ` 2.6.4-mm2 Mary Edie Meredith
@ 2004-03-23 0:27 ` Andrew Morton
2004-03-23 19:21 ` 2.6.4-mm2 Mary Edie Meredith
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2004-03-23 0:27 UTC (permalink / raw)
To: maryedie; +Cc: linux-kernel, linux-mm
Mary Edie Meredith <maryedie@osdl.org> wrote:
>
> [was "Poor DBT-3 pgsql 8way numbers on recent 2.6 mm kernels" on
> linux-mm]
>
> Andrew,
>
> This same patch (02) applied in STP (plm 2780) when run against
> dbt3-pgsql DSS workload displays the performance problem with the
> throughput numbers that I reported on linux-mm on our 8way systems,
> where the previous patch (plm 2777 -01) does not.
>
> Here is the data (patches applied to 2.6.5-rc1)
>
> PLM.....CPUs.Runid..Thruput Metric (bigger is better)
> 2777(01) 8 290298 138.22 (base )
> 2779(02) 8 290304 88.57 (-35.9%)
36% regression due to the CPU scheduler changes? ow.
And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT
makes no difference.
>From a quick look at the material you have there it appears that this
workload also is very I/O bound. It's a little surprising that the CPU
scheduler could make so much difference.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.4-mm2
2004-03-23 0:27 ` 2.6.4-mm2 Andrew Morton
@ 2004-03-23 19:21 ` Mary Edie Meredith
2004-03-23 19:32 ` 2.6.4-mm2 Andrew Morton
0 siblings, 1 reply; 6+ messages in thread
From: Mary Edie Meredith @ 2004-03-23 19:21 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-kernel, linux-mm
On Mon, 2004-03-22 at 16:27, Andrew Morton wrote:
> Mary Edie Meredith <maryedie@osdl.org> wrote:
> >
> > [was "Poor DBT-3 pgsql 8way numbers on recent 2.6 mm kernels" on
> > linux-mm]
> >
> > Andrew,
> >
> > This same patch (02) applied in STP (plm 2780) when run against
> > dbt3-pgsql DSS workload displays the performance problem with the
> > throughput numbers that I reported on linux-mm on our 8way systems,
> > where the previous patch (plm 2777 -01) does not.
> >
> > Here is the data (patches applied to 2.6.5-rc1)
> >
> > PLM.....CPUs.Runid..Thruput Metric (bigger is better)
> > 2777(01) 8 290298 138.22 (base )
> > 2779(02) 8 290304 88.57 (-35.9%)
>
> 36% regression due to the CPU scheduler changes? ow.
>
> And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT
> makes no difference.
>
> >From a quick look at the material you have there it appears that this
> workload also is very I/O bound. It's a little surprising that the CPU
> scheduler could make so much difference.
I'm not sure why you think this is IO bound. For
the throughput phase of the test (from which the
metric above is taken) there is very little physical
IO except at the start when the updates occur. They
finish in a few minutes, after which there is very
little.
http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat_io.png
http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat.txt
Perhaps you were looking at the start or at some other
part of the test?
The power test (single stream phase) does not display
any performance hit at all compared to the baseline.
The throughput test runs eight streams (processes)
and does display the problem. Furthermore the problem
is worse on 8 ways than on 4 ways. It seems reasonable
to me that this could be due to a task schedule issue.
Am I missing something?
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> Please read the FAQ at http://www.tux.org/lkml/
--
Mary Edie Meredith
maryedie@osdl.org
503-626-2455 x42
Open Source Development Labs
--
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.4-mm2
2004-03-23 19:21 ` 2.6.4-mm2 Mary Edie Meredith
@ 2004-03-23 19:32 ` Andrew Morton
2004-03-24 0:07 ` 2.6.4-mm2 Mary Edie Meredith
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2004-03-23 19:32 UTC (permalink / raw)
To: maryedie; +Cc: linux-kernel, linux-mm
Mary Edie Meredith <maryedie@osdl.org> wrote:
>
> > 36% regression due to the CPU scheduler changes? ow.
> >
> > And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT
> > makes no difference.
> >
> > >From a quick look at the material you have there it appears that this
> > workload also is very I/O bound. It's a little surprising that the CPU
> > scheduler could make so much difference.
> I'm not sure why you think this is IO bound. For
> the throughput phase of the test (from which the
> metric above is taken) there is very little physical
> IO except at the start when the updates occur. They
> finish in a few minutes, after which there is very
> little.
>
> http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat_io.png
> http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat.txt
There seems to be a large amount of idle time in the profiles and in the
vmstat trace.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.4-mm2
2004-03-23 19:32 ` 2.6.4-mm2 Andrew Morton
@ 2004-03-24 0:07 ` Mary Edie Meredith
2004-03-30 21:30 ` 2.6.4-mm2 Mary Edie Meredith
0 siblings, 1 reply; 6+ messages in thread
From: Mary Edie Meredith @ 2004-03-24 0:07 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-kernel, linux-mm
On Tue, 2004-03-23 at 11:32, Andrew Morton wrote:
> Mary Edie Meredith <maryedie@osdl.org> wrote:
> >
> > > 36% regression due to the CPU scheduler changes? ow.
> > >
> > > And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT
> > > makes no difference.
> > >
> > > >From a quick look at the material you have there it appears that this
> > > workload also is very I/O bound. It's a little surprising that the CPU
> > > scheduler could make so much difference.
> > I'm not sure why you think this is IO bound. For
> > the throughput phase of the test (from which the
> > metric above is taken) there is very little physical
> > IO except at the start when the updates occur. They
> > finish in a few minutes, after which there is very
> > little.
> >
> > http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat_io.png
> > http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat.txt
>
> There seems to be a large amount of idle time in the profiles and in the
> vmstat trace.
Yes. There is considerably more idle time in the bad run:
Good one:
http://khack.osdl.org/stp/290298/results/plot/thuput.sar_cpu_all.png
Bad one:
http://khack.osdl.org/stp/290304/results/plot/thuput.sar_cpu_all.png
I am concerned with the drop in CPU utilization relative to
the other run.
--
Mary Edie Meredith
maryedie@osdl.org
503-626-2455 x42
Open Source Development Labs
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.4-mm2
2004-03-24 0:07 ` 2.6.4-mm2 Mary Edie Meredith
@ 2004-03-30 21:30 ` Mary Edie Meredith
0 siblings, 0 replies; 6+ messages in thread
From: Mary Edie Meredith @ 2004-03-30 21:30 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-kernel, linux-mm
The 2.6.5-rc2-mm5 kernel has vastly improved the
performance issue with dbt3-pgsql throughput numbers
(bigger is better):
Runid...Metric.PLM..Kernel........diff%
290357 141.84 2788 2.6.5-rc2..... base
290576 91.18 2814 2.6.5-rc2-mm2 -35.72
290856 60.02 2842 2.6.5-rc2-mm4 -57.68
290953 134.10 2849 2.6.5-rc2-mm5 -5.46 <-------
Thanks to Nick and Ingo.
On Tue, 2004-03-23 at 16:07, Mary Edie Meredith wrote:
> On Tue, 2004-03-23 at 11:32, Andrew Morton wrote:
> > Mary Edie Meredith <maryedie@osdl.org> wrote:
> > >
> > > > 36% regression due to the CPU scheduler changes? ow.
> > > >
> > > > And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT
> > > > makes no difference.
> > > >
> > > > >From a quick look at the material you have there it appears that this
> > > > workload also is very I/O bound. It's a little surprising that the CPU
> > > > scheduler could make so much difference.
> > > I'm not sure why you think this is IO bound. For
> > > the throughput phase of the test (from which the
> > > metric above is taken) there is very little physical
> > > IO except at the start when the updates occur. They
> > > finish in a few minutes, after which there is very
> > > little.
> > >
> > > http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat_io.png
> > > http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat.txt
> >
> > There seems to be a large amount of idle time in the profiles and in the
> > vmstat trace.
> Yes. There is considerably more idle time in the bad run:
> Good one:
> http://khack.osdl.org/stp/290298/results/plot/thuput.sar_cpu_all.png
> Bad one:
> http://khack.osdl.org/stp/290304/results/plot/thuput.sar_cpu_all.png
>
> I am concerned with the drop in CPU utilization relative to
> the other run.
--
Mary Edie Meredith
maryedie@osdl.org
503-626-2455 x42
Open Source Development Labs
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2004-03-22 17:19 ` 2.6.4-mm2 Mary Edie Meredith
2004-03-23 0:27 ` 2.6.4-mm2 Andrew Morton
2004-03-23 19:21 ` 2.6.4-mm2 Mary Edie Meredith
2004-03-23 19:32 ` 2.6.4-mm2 Andrew Morton
2004-03-24 0:07 ` 2.6.4-mm2 Mary Edie Meredith
2004-03-30 21:30 ` 2.6.4-mm2 Mary Edie Meredith
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