Re: scsi-mq performance check

[John Garry <john.garry@huawei.com>]

>> We have to lock due to how we reserve a slot in the delivery queue.
>> We are looking to optimise this, but it's not straightforward.
>>
>> Perf is a good strategy, but, to be honest, I have not spent a lot
>> of time looking at this so I'm looking for low hanging fruit initially.
>>
>> FYI, our hardware does have the same number of delivery and
>> completion queues (32), and 16 cores. One thing to note is that a
>> command which was sent on queue x is not quaranteed to complete on
>> queue y.
>>
> ... then don't bother looking at scsi-mq. That is the very thing it
> relies on ...
>
> Time to change the firmware?
>
> Cheers,
>
> Hannes

Hi,

Even though a slot delivered on queue x is not guaranteed to complete on 
completion queue x, is nearly always does (I just quickly tested on our 
new chip, and 100% of the time it is the same - I need to check with our 
hardware guys if this was only v1 of the IP).

As for firmware, our controller does not have any.

cheers,