On 04/26/2017 08:37 PM, Bart Van Assche wrote: > Reduce the requeue delay in dm_requeue_original_request() from 5s > to 0.5s to avoid that this delay slows down failover or failback. > Increase the requeue delay in dm_mq_queue_rq() from 0.1s to 0.5s > to reduce the system load if immediate requeuing has been requested > by the dm driver. > > Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> > Cc: Hannes Reinecke <hare@xxxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > --- > drivers/md/dm-rq.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c > index 0b081d170087..c53debdcd7dc 100644 > --- a/drivers/md/dm-rq.c > +++ b/drivers/md/dm-rq.c > @@ -280,7 +280,7 @@ static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_ > if (!rq->q->mq_ops) > dm_old_requeue_request(rq); > else > - dm_mq_delay_requeue_request(rq, delay_requeue ? 5000 : 0); > + dm_mq_delay_requeue_request(rq, delay_requeue ? 500/*ms*/ : 0); > > rq_completed(md, rw, false); > } > @@ -755,7 +755,7 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, > /* Undo dm_start_request() before requeuing */ > rq_end_stats(md, rq); > rq_completed(md, rq_data_dir(rq), false); > - blk_mq_delay_run_hw_queue(hctx, 100/*ms*/); > + blk_mq_delay_run_hw_queue(hctx, 500/*ms*/); > return BLK_MQ_RQ_QUEUE_BUSY; > } > > Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
