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authorEd L. Cashin <ecashin@coraid.com>2006-09-20 14:36:49 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-10-18 15:53:50 -0400
commitdced3a053dd5415a7321e1ae153c96dea644da4e (patch)
treeeffc221b2b7b2f2cb39996ed834c279ce409e7e7 /drivers/block/aoe/aoecmd.c
parentddec63e86752b89776547e93aa68af01f1cbb10c (diff)
aoe: improve retransmission heuristics
Add a dynamic minimum timer for better retransmission behavior. Signed-off-by: "Ed L. Cashin" <ecashin@coraid.com> Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/block/aoe/aoecmd.c')
-rw-r--r--drivers/block/aoe/aoecmd.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 621fdbbc4cd4..c0bdc1fe21f0 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -461,8 +461,15 @@ calc_rttavg(struct aoedev *d, int rtt)
461 register long n; 461 register long n;
462 462
463 n = rtt; 463 n = rtt;
464 if (n < MINTIMER) 464 if (n < 0) {
465 n = MINTIMER; 465 n = -rtt;
466 if (n < MINTIMER)
467 n = MINTIMER;
468 else if (n > MAXTIMER)
469 n = MAXTIMER;
470 d->mintimer += (n - d->mintimer) >> 1;
471 } else if (n < d->mintimer)
472 n = d->mintimer;
466 else if (n > MAXTIMER) 473 else if (n > MAXTIMER)
467 n = MAXTIMER; 474 n = MAXTIMER;
468 475
@@ -498,8 +505,10 @@ aoecmd_ata_rsp(struct sk_buff *skb)
498 505
499 spin_lock_irqsave(&d->lock, flags); 506 spin_lock_irqsave(&d->lock, flags);
500 507
501 f = getframe(d, be32_to_cpu(hin->tag)); 508 n = be32_to_cpu(hin->tag);
509 f = getframe(d, n);
502 if (f == NULL) { 510 if (f == NULL) {
511 calc_rttavg(d, -tsince(n));
503 spin_unlock_irqrestore(&d->lock, flags); 512 spin_unlock_irqrestore(&d->lock, flags);
504 snprintf(ebuf, sizeof ebuf, 513 snprintf(ebuf, sizeof ebuf,
505 "%15s e%d.%d tag=%08x@%08lx\n", 514 "%15s e%d.%d tag=%08x@%08lx\n",
@@ -724,6 +733,7 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
724 return; 733 return;
725 } 734 }
726 d->flags |= DEVFL_PAUSE; /* force pause */ 735 d->flags |= DEVFL_PAUSE; /* force pause */
736 d->mintimer = MINTIMER;
727 d->fw_ver = be16_to_cpu(ch->fwver); 737 d->fw_ver = be16_to_cpu(ch->fwver);
728 738
729 /* check for already outstanding ataid */ 739 /* check for already outstanding ataid */