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
