>>Can you do a perf report -ag and then a perf report to see where these >>cycles are spent? Yes, sure. I have attached the perf report to this mail. (This is with kernel 3.14, don't have access to my 3.18 host for now) ----- Mail original ----- De: "Christoph Hellwig" <hch@xxxxxxxxxxxxx> À: "Alexandre DERUMIER" <aderumier@xxxxxxxxx> Cc: "Christoph Hellwig" <hch@xxxxxxxxxxxxx>, "Ceph Devel" <ceph-devel@xxxxxxxxxxxxxxx> Envoyé: Lundi 27 Octobre 2014 10:45:56 Objet: Re: krbd blk-mq support ? On Sun, Oct 26, 2014 at 02:46:03PM +0100, Alexandre DERUMIER wrote: > Hi, > > some news: > > I have applied patches succefully on top of 3.18-rc1 kernel. > > But don't seem to help is my case. > (I think that blk-mq is working because I don't see any io schedulers on rbd devices, as blk-mq don't support them actually). > > My main problem is that I can't reach more than around 50000iops on 1 machine, > > and the problem seem to be the kworker process stuck at 100% of 1core. Can you do a perf report -ag and then a perf report to see where these cycles are spent?
Attachment:
report.txt.gz
Description: GNU Zip compressed data
