[Scst-devel] [ofa-general] SRP/mlx4 interrupts throttling performance

[Cameron Harr]

Vladislav Bolkhovitin wrote:
> Cameron Harr, on 02/26/2009 08:19 PM wrote:
>> Cameron Harr wrote:
>>> Cameron Harr wrote:
>>> I re-compiled and re-ran the tests and numbers are a little better 
>>> but performance still seems to have gone down from 673:
>>> Test 1:373751.66
>>> Test 2:371242.6067
>>> Test 3:347988.1467
>>> Test 4:378247.31
>>> Test 5:375616.53
>> I was curious and did a regression test with 673 and those numbers 
>> are now even worse, so I'll presume there is an issue on my system 
>> and not the SCST code:
>> Test 1:365204.3067
>> Test 2:364152.2067
>> Test 3:340665.7633
>> Test 4:369916.8133
>> Test 5:369093.5833
>
> It's known that any OS, including Linux, is getting "tired" under load 
> with time from boot, which leads to worse performance. I guess, you 
> can experience such effect.
>
> Check with r634. R635 has cache locality in data structures related 
> change, which intended to improve performance a bit, but might make it 
> worse instead.
>

This is with 634. It's pretty bad:
338316.44
329698.04
307972.7133
345682.4733
344165.08