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SubjectRe: [PATCH 0/8] locking/core patches
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On Mon, 2014-02-10 at 15:02 -0800, Andrew Morton wrote:
> On Mon, 10 Feb 2014 20:58:20 +0100 Peter Zijlstra <peterz@infradead.org> wrote:
>
> > Hi all,
> >
> > I would propose merging the following patches...
> >
> > The first set is mostly from Jason and tweaks the mutex adaptive
> > spinning, AIM7 throughput numbers:
> >
> > PRE: 100 2000.04 21564.90 2721.29 311.99 3.12 0.01 0.00 99
> > POST: 100 2000.04 42603.85 5142.80 311.99 3.12 0.00 0.00 99
>
> What do these columns represent? I'm guessing the large improvement
> was in context switches?

Hello,

I also re-tested the mutex patches 1-6 on my 2 and 8 socket machines
with the high_systime and fserver AIM7 workloads (ran on disk). The
workloads are able to generate contention on the
&EXT4_SB(inode->i_sb)->s_orphan_lock mutex. Below are the % improvement
in throughput with the patches on a recent tip kernel. The main benefits
were on the larger box and when there were higher number of users.

Note: the -0.7% drop in performance for fserver at 10-90 users on the 2
socket machine was mainly due to "[PATCH 6/8] mutex: Extra reschedule
point". Without patch 6, there was almost no % difference in throughput
between the baseline kernel and kernel with patches 1-5.


8 socket machine:

--------------------------
fserver
--------------------------
users | % improvement
| in throughput
| with patches
--------------------------
1000-2000 | +29.2%
--------------------------
100-900 | +10.0%
--------------------------
10-90 | +0.4%


--------------------------
high_systime
--------------------------
users | % improvement
| in throughput
| with patches
--------------------------
1000-2000 | +34.9%
--------------------------
100-900 | +49.2%
--------------------------
10-90 | +3.1%



2 socket machine:

--------------------------
fserver
--------------------------
users | % improvement
| in throughput
| with patches
--------------------------
1000-2000 | +1.8%
--------------------------
100-900 | +0.0%
--------------------------
10-90 | -0.7%


--------------------------
high_systime
--------------------------
users | % improvement
| in throughput
| with patches
--------------------------
1000-2000 | +0.8%
--------------------------
100-900 | +0.4%
--------------------------
10-90 | +0.0%






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