Re: Performance comparaison with dbench on KVM

[Laurent Vivier <Laurent.Vivier-6ktuUTfB/bM@public.gmane.org>]

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Anthony Liguori wrote:
> Laurent Vivier wrote:
>> Anthony Liguori wrote:
>>   Hi Anthony,
>>
>> I didn't modify aio_init limit...
>>   
> 
> It would be pretty useful to give it a try.  In qemu_aio_init() where
> aio_init() get's called.  If you just bump aio_threads and aio_num from
> 1 to, say, 32. You should see a big difference in SCSI performance.
> 

I made some tests as you explained, but results are worst.

with:
        ai.aio_threads = 32;
        ai.aio_num = 32;

I have:

KVM-25 + SCSI + aio_init(32 threads)

Throughput 332.305 MB/sec 1 procs
Throughput 316.832 MB/sec 2 procs
Throughput 246.741 MB/sec 4 procs
Throughput 142.115 MB/sec 8 procs
Throughput 107.227 MB/sec 16 procs
Throughput 54.6614 MB/sec 32 proc
Throughput 21.3738 MB/sec 64 procs

Laurent
-- 
------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org  --------------
       "Any sufficiently advanced technology is
  indistinguishable from magic." - Arthur C. Clarke


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