On Wed, Feb 07, 2018 at 07:50:21AM +0100, Hannes Reinecke wrote: > Hi all, > > [ .. ] > >> > >> Could you share us your patch for enabling global_tags/MQ on > > megaraid_sas > >> so that I can reproduce your test? > >> > >>> See below perf top data. "bt_iter" is consuming 4 times more CPU. > >> > >> Could you share us what the IOPS/CPU utilization effect is after > > applying the > >> patch V2? And your test script? > > Regarding CPU utilization, I need to test one more time. Currently system > > is in used. > > > > I run below fio test on total 24 SSDs expander attached. > > > > numactl -N 1 fio jbod.fio --rw=randread --iodepth=64 --bs=4k > > --ioengine=libaio --rw=randread > > > > Performance dropped from 1.6 M IOPs to 770K IOPs. > > > This is basically what we've seen with earlier iterations. Hi Hannes, As I mentioned in another mail[1], Kashyap's patch has a big issue, which causes only reply queue 0 used. [1] https://marc.info/?l=linux-scsi&m=151793204014631&w=2 So could you guys run your performance test again after fixing the patch? Thanks, Ming
