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| author | Ed L. Cashin <ecashin@coraid.com> | 2006-09-20 14:36:49 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-10-18 12:53:50 -0700 |
| commit | dced3a053dd5415a7321e1ae153c96dea644da4e (patch) | |
| tree | effc221b2b7b2f2cb39996ed834c279ce409e7e7 /drivers/block/aoe | |
| parent | ddec63e86752b89776547e93aa68af01f1cbb10c (diff) | |
| download | linux-dced3a053dd5415a7321e1ae153c96dea644da4e.tar.gz linux-dced3a053dd5415a7321e1ae153c96dea644da4e.tar.bz2 linux-dced3a053dd5415a7321e1ae153c96dea644da4e.zip | |
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')
| -rw-r--r-- | drivers/block/aoe/aoe.h | 7 | ||||
| -rw-r--r-- | drivers/block/aoe/aoecmd.c | 16 |
2 files changed, 17 insertions, 6 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index 4d79f1eaf708..7b1121748633 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -125,8 +125,10 @@ struct aoedev { ulong sysminor; ulong aoemajor; ulong aoeminor; - ulong nopen; /* (bd_openers isn't available without sleeping) */ - ulong rttavg; /* round trip average of requests/responses */ + u16 nopen; /* (bd_openers isn't available without sleeping) */ + u16 lasttag; /* last tag sent */ + u16 rttavg; /* round trip average of requests/responses */ + u16 mintimer; u16 fw_ver; /* version of blade's firmware */ u16 maxbcnt; struct work_struct work;/* disk create work struct */ @@ -142,7 +144,6 @@ struct aoedev { mempool_t *bufpool; /* for deadlock-free Buf allocation */ struct list_head bufq; /* queue of bios to work on */ struct buf *inprocess; /* the one we're currently working on */ - ulong lasttag; /* last tag sent */ ushort lostjumbo; ushort nframes; /* number of frames below */ struct frame *frames; 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) register long n; n = rtt; - if (n < MINTIMER) - n = MINTIMER; + if (n < 0) { + n = -rtt; + if (n < MINTIMER) + n = MINTIMER; + else if (n > MAXTIMER) + n = MAXTIMER; + d->mintimer += (n - d->mintimer) >> 1; + } else if (n < d->mintimer) + n = d->mintimer; else if (n > MAXTIMER) n = MAXTIMER; @@ -498,8 +505,10 @@ aoecmd_ata_rsp(struct sk_buff *skb) spin_lock_irqsave(&d->lock, flags); - f = getframe(d, be32_to_cpu(hin->tag)); + n = be32_to_cpu(hin->tag); + f = getframe(d, n); if (f == NULL) { + calc_rttavg(d, -tsince(n)); spin_unlock_irqrestore(&d->lock, flags); snprintf(ebuf, sizeof ebuf, "%15s e%d.%d tag=%08x@%08lx\n", @@ -724,6 +733,7 @@ aoecmd_cfg_rsp(struct sk_buff *skb) return; } d->flags |= DEVFL_PAUSE; /* force pause */ + d->mintimer = MINTIMER; d->fw_ver = be16_to_cpu(ch->fwver); /* check for already outstanding ataid */ |