[dm-devel] [PATCH 1/1] block: Convert hd_struct in_flight from atomic to percpu

[Jens Axboe]

On 07/04/2017 02:55 PM, Brian King wrote:
> On 07/01/2017 11:43 AM, Jens Axboe wrote:
>> Now:
>>
>> http://git.kernel.dk/cgit/linux-block/commit/?h=mq-inflight&id=87f73ef2b9edb6834001df8f7cb48c7a116e8cd3
>>
>>> And updated the branch here:
>>>
>>> http://git.kernel.dk/cgit/linux-block/log/?h=mq-inflight
>>>
>>> to include that, and be based on top of for-4.13/block. If you prefer just
>>> pulling a branch, pull:
>>>
>>> git://git.kernel.dk/linux-block mq-inflight
>>
>> I've tested it, and made a few adjustments and fixes. The branches are
>> the same, just rebased. Works fine for me, even with partitions now.
>>
>> Let me know how it works for you.
> 
> This is looking very nice. This is what I'm seeing now:
> 
> 1 null_blk device / 80 submit_queues / fio numjobs=80
> 9.4M IOPs
> 
> 80 null_blk devices / 1 submit_queue per null_blk / fio numjobs=1 (1 per null_blk)
> 9.3M IOPs
> 
> 1 null_blk device / 160 submit_queues / fio numjobs=160
> 9.8M IOPs
> 
> 160 null_blk devices / 1 submit_queue per null_blk / fio numjobs=1 (1 per null_blk)
> 8.9M IOPs
> 
> What is queued in mq-inflight looks to resolve the issue I've been seeing.

Good to hear! I'll test some corner cases and post a "real" version
for review. Thanks for all your testing.

-- 
Jens Axboe