* Rafael Aquini <aqu...@redhat.com> [2013-01-10 00:27:23]:
> On Wed, Jan 09, 2013 at 06:20:35PM +0530, Raghavendra K T wrote:
> > I ran kernbench on 32 core (mx3850) machine with 3.8-rc2 base.
> > x base_3.8rc2
> > + rik_backoff
> > N Min Max Median Avg Stddev
> > x 8 222.977 231.16 227.735 227.388 3.1512986
> > + 8 218.75 232.347 229.1035 228.25425 4.2730225
> > No difference proven at 95.0% confidence
>
> I got similar results on smaller systems (1 socket, dual-cores and quad-cores)
> when running Rik's latest series, no big difference for good nor for worse,
> but I also think Rik's work is meant to address bigger systems with more cores
> contending for any given spinlock.
I was able to do the test on same 32 core machine with
4 guests (8GB RAM, 32 vcpu).
Here are the results
base = 3.8-rc2
patched = base + Rik V3 backoff series [patch 1-4]
+-----------+-----------+-----------+------------+-----------+
kernbench (sec lower is better)
+-----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improve
+-----------+-----------+-----------+------------+-----------+
44.3000 2.0404 46.7928 1.7518 -5.62709
94.8262 5.1444 102.4737 7.8406 -8.06475
156.0540 14.5797 167.6888 9.7110 -7.45562
202.3225 15.8906 213.1435 17.1778 -5.34839
+-----------+-----------+-----------+------------+-----------+
+-----------+-----------+-----------+------------+-----------+
sysbench (sec lower is better)
+-----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improve
+-----------+-----------+-----------+------------+-----------+
16.8512 0.4164 17.7301 0.3761 -5.21565
13.0411 0.4115 12.9380 0.1554 0.79058
18.4573 0.2123 18.4662 0.2005 -0.04822
24.2021 0.1713 24.3690 0.3270 -0.68961
+-----------+-----------+-----------+------------+-----------+
+-----------+-----------+-----------+------------+-----------+
ebizzy (record/sec higher is better)
+-----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improve
+-----------+-----------+-----------+------------+-----------+
2494.4000 27.5447 2400.6000 83.4255 -3.76042
2636.6000 302.9658 2757.5000 147.5137 4.58545
2236.8333 239.6531 2131.6667 156.1534 -4.70158
1768.8750 142.5437 1901.3750 295.2147 7.49064
+-----------+-----------+-----------+------------+-----------+
+-----------+-----------+-----------+------------+-----------+
dbench (throughput in MB/sec higher is better)
+-----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improve
+-----------+-----------+-----------+------------+-----------+
10076.9180 2410.9655 5870.7460 4297.4532 xxxxxxx
2152.5220 88.2853 1517.8270 61.9742 -29.48611
1334.9608 34.3247 1078.4275 38.2288 -19.21654
946.6355 32.0426 753.0757 25.5302 -20.44713
+-----------+-----------+-----------+------------+-----------+
Please note that I have put dbench_1x result as xxxx since I observed
very high variance in the result.
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