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. Regards Laurence
