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xen/blkback: Don't let in-flight requests defer pending ones.

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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 <daniel.stodden@citrix.com>
[v1: Rebased and fixed compile problems]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Daniel Stodden 2011-05-28 13:21:10 -07:00 committed by Konrad Rzeszutek Wilk
parent 2b727c6300
commit b4726a9df2
1 changed files with 19 additions and 17 deletions
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36
drivers/block/xen-blkback/blkback.c
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@ -458,7 +458,8 @@ 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;
@ -515,6 +516,23 @@ static int do_block_io_op(struct xen_blkif *blkif)
return more_to_do;
}
static int
do_block_io_op(struct xen_blkif *blkif)
{
union blkif_back_rings *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.
@ -700,7 +718,6 @@ 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;
@ -727,22 +744,7 @@ 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);
}