[ofa-general] SRP/mlx4 interrupts throttling performance

[Vladislav Bolkhovitin]

Cameron Harr wrote:
> Vladislav Bolkhovitin wrote:
>> Cameron Harr wrote:
>>> Vladislav Bolkhovitin wrote:
>>>> I guess, you use a regular caching IO? The lowest packet size it can 
>>>> produce is a PAGE_SIZE (4K). Target can't change it. You can have 
>>>> lower packets only with O_DIRECT or sg interface. But I'm not sure 
>>>> it will be performance effective.
>>> I do everything with Direct IO, which is automatic when using the 
>>> BLOCKIO method in SCST.
>> I meant on initiator(s), not on the target.
>>
> Sorry - but yes, I always run the benchmark apps with direct IO

Then, there's one more reason why we should find out the cause of such a 
big variation between runs. Can you repeat all the tests with the latest 
SCST SVN trunk/ including SRPT driver with each run for at least few 
minutes?

Which backstorage do you use for BLOCKIO?