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

[Jack Wang <jack.wang.usish@gmail.com>]

Jens Axboe <axboe@kernel.dk> 于2018年7月23日周一 下午5:31写道：
>
> On 7/23/18 9:28 AM, Jack Wang wrote:
> > Jens Axboe <axboe@kernel.dk> 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@linuxfoundation.org> 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
>
Do you think it make sense to port Roman's patch to upstream 4.14?

So others would also be benifitial?
On the other side, stable tree only takes patches accepted into Linus tree.

Thanks,
Jack