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SubjectRe: [PATCH RFC V10 0/18] Paravirtualized ticket spinlocks
On Mon, Jun 24, 2013 at 06:10:14PM +0530, Raghavendra K T wrote:
>
> Results:
> =======
> base = 3.10-rc2 kernel
> patched = base + this series
>
> The test was on 32 core (model: Intel(R) Xeon(R) CPU X7560) HT disabled
> with 32 KVM guest vcpu 8GB RAM.

Have you ever tried to get results with HT enabled?

>
> +-----------+-----------+-----------+------------+-----------+
> ebizzy (records/sec) higher is better
> +-----------+-----------+-----------+------------+-----------+
> base stdev patched stdev %improvement
> +-----------+-----------+-----------+------------+-----------+
> 1x 5574.9000 237.4997 5618.0000 94.0366 0.77311
> 2x 2741.5000 561.3090 3332.0000 102.4738 21.53930
> 3x 2146.2500 216.7718 2302.3333 76.3870 7.27237
> 4x 1663.0000 141.9235 1753.7500 83.5220 5.45701
> +-----------+-----------+-----------+------------+-----------+

This looks good. Are your ebizzy results consistent run to run
though?

> +-----------+-----------+-----------+------------+-----------+
> dbench (Throughput) higher is better
> +-----------+-----------+-----------+------------+-----------+
> base stdev patched stdev %improvement
> +-----------+-----------+-----------+------------+-----------+
> 1x 14111.5600 754.4525 14645.9900 114.3087 3.78718
> 2x 2481.6270 71.2665 2667.1280 73.8193 7.47498
> 3x 1510.2483 31.8634 1503.8792 36.0777 -0.42173
> 4x 1029.4875 16.9166 1039.7069 43.8840 0.99267
> +-----------+-----------+-----------+------------+-----------+

Hmm, I wonder what 2.5x looks like. Also, the 3% improvement with
no overcommit is interesting. What's happening there? It makes
me wonder what < 1x looks like.

thanks,
drew


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