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

[Cameron Harr]

Vladislav Bolkhovitin wrote:
>>>> I ran each test 3 times and took the averages. In order to get a 
>>>> quick look at performance per run, I added a column in the summary 
>>>> that sums the IOPs for each test with SRPT thread enabled and then 
>>>> not enabled. Test 4 seems to give the best results. Here's a brief 
>>>> summary of that summary with just SRPT thread=0:
>>>>
>>>> Baseline: 356226.39
>>>> Test 1:   371217.6533
>>>> Test 2:   370553.78
>>>> Test 3:   373295.2033
>>>> Test 4:   399385.2233
>>>> Test 5:   393204.5833
>>> Linux CPU scheduler does really impressive job!
>>>
>>> Interesting, will something change with:
>>>
>>> 1. The latest SVN. It has some changes, which might make a difference.
>> Sorry for the delay.
>> This is with SVN rev 673. I don't hit the high I hit before, but at a 
>> 1.8% difference (with test 4), it's statistically noise.
>>
>> Test 1: 390631.5133
>> Test 2: 386125.4133
>> Test 3: 356268.0267
>> Test 4: 392237.7867
>> Test 5: 390012.1467 
I just ran again, this time with rev 680 and am a little concerned to 
see the drop in performance. I verified that debug is not on. I'll try 
to start another run on 680 to see if I get similar results.

Test 1:368342.41
Test 2:366787.2067
Test 3:345334.68
Test 4:372684.58
Test 5:372184.8333