> -----Original Message----- > From: Laurence Oberman [mailto:loberman@xxxxxxxxxx] > Sent: Monday, July 2, 2018 5:11 PM > To: Ming Lei; Jens Axboe > Cc: linux-block@xxxxxxxxxxxxxxx; Kashyap Desai; Omar Sandoval; Christoph > Hellwig; Bart Van Assche; Hannes Reinecke > Subject: Re: [PATCH V3 0/3] blk-mq: improve IO perf in case of none io > sched > > On Mon, 2018-07-02 at 17:35 +0800, Ming Lei wrote: > > Hi, > > > > The 1st 2 patch improves ctx->lock uses, and it is observed that IOPS > > may be improved by ~5% in rand IO test on MegaRaid SAS run by > > Kashyap. > > > > The 3rd patch fixes rand IO performance regression on MegaRaid SAS > > test, still reported by Kashyap. > > > > V3: > > - export dispatch busy from debugfs as suggested by Jens > > - add comment on blk_mq_update_hctx_busy() as suggested by > > Christoph > > > > V2: > > - fix list corruption in patch 1/3 > > > > > > Ming Lei (3): > > blk-mq: use list_splice_tail_init() to insert requests > > blk-mq: only attempt to merge bio if there is rq in sw queue > > blk-mq: dequeue request one by one from sw queue iff hctx is busy > > > > > > block/blk-mq-debugfs.c | 9 +++++++++ > > block/blk-mq-sched.c | 14 ++++---------- > > block/blk-mq.c | 44 ++++++++++++++++++++++++++++++++++++-- > > ------ > > include/linux/blk-mq.h | 3 ++- > > 4 files changed, 51 insertions(+), 19 deletions(-) > > > > Cc: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx> > > Cc: Laurence Oberman <loberman@xxxxxxxxxx> > > Cc: Omar Sandoval <osandov@xxxxxx> > > Cc: Christoph Hellwig <hch@xxxxxx> > > Cc: Bart Van Assche <bart.vanassche@xxxxxxx> > > Cc: Hannes Reinecke <hare@xxxxxxx> > > > > Thanks Ming, I repaired my MSA50 shelf so will functional test. > I have 6 SSD drives working in there now. > I know its already been tested by Kashyap. Performance is back to 1.6M IOPS which was earlier 1.3M IOPs on SSD based VD @MegaRaid controller setup. Tested-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx> > > Regards > Laurence
