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

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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.

Thanks,
Jack




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