[ofa-general] SRP/mlx4 interrupts throttling performance

[Vladislav Bolkhovitin]

Cameron Harr wrote:
> Vladislav Bolkhovitin wrote:
>> Cameron Harr wrote:
>>>>>> Also, as I mentioned before, my time is going to be fairly limited 
>>>>>> for a while, but I'll try to squeeze this in and will make sure I 
>>>>>> run for longer periods of time. I'll also try to calculate an 
>>>>>> exact end number based on iop/runtime.
>>>>>>> Which backstorage do you use for BLOCKIO?
>>>>>> Fusion IO ioDrive. I generally use 1 or 2, but somtimes up to 4 at 
>>>>>> a time.
>>>>> It might be a reason of not stable results. Can you try with NULLIO 
>>>>> to narrow things down a bit?
>>> I actually tested NULLIO a while back at Vu's suggestion, but I 
>>> believe I forgot to report on it. From my recollection, NULLIO gave 
>>> me pretty consistent block sizes of 512B, which is the BS I used in 
>>> the benchmark.
>> Were the IOPS, CS and IRQ rates results stable and consistent between 
>> runs?
> 
> I don't remember about the IOPs, but CS and IRQ rates were stable. 
> However, they've also become stable in my later runs with 
> scst_threads=[123].

But with srpt_thread=0 - not, right?

>> Anyway, try with the latest code. There are noticeable changes there.
>>
>> BTW, since you use the solid state media, you don't need any IO 
>> scheduler. Hence, noop should be the best choice for you.
> noop is what I've been running for the past while, before switching to 
> deadline yesterday.
>