Re: [stable-4.14 00/23] block/scsi multiqueue performance enhancement and

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On 7/23/18 9:28 AM, Jack Wang wrote:
> Jens Axboe <axboe@xxxxxxxxx> 于2018年7月23日周一 下午5:05写道:
>>
>> On 7/23/18 9:00 AM, Jack Wang wrote:
>>> Hi Greg,
>>>
>>> Thanks for quick reply. Please see reply inline.
>>>
>>>
>>>
>>> Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 于2018年7月23日周一 下午3:34写道:
>>>>
>>>> On Mon, Jul 23, 2018 at 03:24:22PM +0200, Jack Wang wrote:
>>>>> Hi Greg,
>>>>>
>>>>> Please consider this patchset, which include block/scsi multiqueue performance
>>>>> enhancement and bugfix.
>>>>
>>>> What exactly is the performance enhancement?  How can you measure it?
>>>> How did you measure it?
>>> I'm testing on SRP/IBNBD using fio, I've seen +10% with mix IO load,
>>> and 50% improvement on small IO (bs=512.) with the patchset.
>>
>> Big nak on backporting this huge series, it's a lot of core changes.
>> It's way beyond the scope of a stable fix backport.
>>
>> --
>> Jens Axboe
>>
> OK, could you shed light on how could we fix the queue stall problem on 4.14?
> My colleague Roman reported to upstream:
> https://lkml.org/lkml/2017/10/18/263
> 
> It's still there on latest 4.14.

The proposed patch is a helluva lot simpler than doing a 23 patch selective
backport.

-- 
Jens Axboe




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