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SubjectRe: [PATCH RFC V10 0/18] Paravirtualized ticket spinlocks
On 06/24/2013 06:47 PM, Andrew Jones wrote:
> 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.
>

Hi Andrew,

I tried 2.5x case sort where I used 3 guests with 27 vcpu each on 32
core (HT disabled machine) and here is the output. almost no gain there.

throughput avg stdev
base: 1768.7458 MB/sec 54.044221
patched: 1772.5617 MB/sec 41.227689
gain %0.226

I am yet to try HT enabled cases that would give 0.5x to 2x performance
results.



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