From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Stodden Subject: [PATCH] xen/blkback: Don't let in-flight requests defer pending ones. Date: Sat, 28 May 2011 13:21:10 -0700 Message-ID: <1306614070-13137-1-git-send-email-daniel.stodden@citrix.com> References: <1306613567.20284.83.camel@ramone> Return-path: In-Reply-To: <1306613567.20284.83.camel@ramone> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Xen Cc: pradeepv@amazon.com, Daniel Stodden , konrad.wilk@oracle.com List-Id: xen-devel@lists.xenproject.org Running RING_FINAL_CHECK_FOR_REQUESTS from make_response is a bad idea. It means that in-flight I/O is essentially blocking continued batches. This essentially kills throughput on frontends which unplug (or even just notify) early and rightfully assume addtional requests will be picked up on time, not synchronously. Signed-off-by: Daniel Stodden --- drivers/block/xen-blkback/blkback.c | 36 ++++++++++++++++++---------------- 1 files changed, 19 insertions(+), 17 deletions(-) diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 9dee545..48ad7fa 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -451,7 +451,8 @@ static void end_block_io_op(struct bio *bio, int error) * (which has the sectors we want, number of them, grant references, etc), * and transmute it to the block API to hand it over to the proper block disk. */ -static int do_block_io_op(struct xen_blkif *blkif) +static int +__do_block_io_op(struct xen_blkif *blkif) { union blkif_back_rings *blk_rings = &blkif->blk_rings; struct blkif_request req; @@ -508,6 +509,23 @@ static int do_block_io_op(struct xen_blkif *blkif) return more_to_do; } +static int +do_block_io_op(blkif_t *blkif) +{ + blkif_back_rings_t *blk_rings = &blkif->blk_rings; + int more_to_do; + + do { + more_to_do = __do_block_io_op(blkif); + if (more_to_do) + break; + + RING_FINAL_CHECK_FOR_REQUESTS(&blk_rings->common, more_to_do); + } while (more_to_do); + + return more_to_do; +} + /* * Transmutation of the 'struct blkif_request' to a proper 'struct bio' * and call the 'submit_bio' to pass it to the underlying storage. @@ -698,7 +716,6 @@ static void make_response(struct xen_blkif *blkif, u64 id, struct blkif_response resp; unsigned long flags; union blkif_back_rings *blk_rings = &blkif->blk_rings; - int more_to_do = 0; int notify; resp.id = id; @@ -725,22 +742,7 @@ static void make_response(struct xen_blkif *blkif, u64 id, } blk_rings->common.rsp_prod_pvt++; RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&blk_rings->common, notify); - if (blk_rings->common.rsp_prod_pvt == blk_rings->common.req_cons) { - /* - * Tail check for pending requests. Allows frontend to avoid - * notifications if requests are already in flight (lower - * overheads and promotes batching). - */ - RING_FINAL_CHECK_FOR_REQUESTS(&blk_rings->common, more_to_do); - - } else if (RING_HAS_UNCONSUMED_REQUESTS(&blk_rings->common)) { - more_to_do = 1; - } - spin_unlock_irqrestore(&blkif->blk_ring_lock, flags); - - if (more_to_do) - blkif_notify_work(blkif); if (notify) notify_remote_via_irq(blkif->irq); } -- 1.7.4.1