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| author | Ed L. Cashin <ecashin@coraid.com> | 2008-02-08 04:20:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 09:22:32 -0800 |
| commit | 7df620d852642d424afc9777fe57880e02c92832 (patch) | |
| tree | 9bd0b23534c02f1a8adb3cc7972f4976a7148cb3 | |
| parent | 6b9699bbd24e82d2ec3bb5a43100099a936ded04 (diff) | |
| download | linux-7df620d852642d424afc9777fe57880e02c92832.tar.gz linux-7df620d852642d424afc9777fe57880e02c92832.tar.bz2 linux-7df620d852642d424afc9777fe57880e02c92832.zip | |
aoe: add module parameter for users who need more outstanding I/O
An AoE target provides an estimate of the number of outstanding commands that
the AoE initiator can send before getting a response. The aoe_maxout
parameter provides a way to set an even lower limit. It will not allow a user
to use more outstanding commands than the target permits. If a user discovers
a problem with a large setting, this parameter provides a way for us to work
with them to debug the problem. We expect to improve the dynamic window
sizing algorithm and drop this parameter. For the time being, it is a
debugging aid.
Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/block/aoe/aoecmd.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 7a9618313ea3..e92d885803a3 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -18,6 +18,11 @@ static int aoe_deadsecs = 60 * 3; module_param(aoe_deadsecs, int, 0644); MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev."); +static int aoe_maxout = 16; +module_param(aoe_maxout, int, 0644); +MODULE_PARM_DESC(aoe_maxout, + "Only aoe_maxout outstanding packets for every MAC on eX.Y."); + static struct sk_buff * new_skb(ulong len) { @@ -984,7 +989,6 @@ aoecmd_cfg_rsp(struct sk_buff *skb) struct aoeif *ifp; ulong flags, sysminor, aoemajor; struct sk_buff *sl; - enum { MAXFRAMES = 16 }; u16 n; h = (struct aoe_hdr *) skb_mac_header(skb); @@ -1009,8 +1013,8 @@ aoecmd_cfg_rsp(struct sk_buff *skb) } n = be16_to_cpu(ch->bufcnt); - if (n > MAXFRAMES) /* keep it reasonable */ - n = MAXFRAMES; + if (n > aoe_maxout) /* keep it reasonable */ + n = aoe_maxout; d = aoedev_by_sysminor_m(sysminor); if (d == NULL) { |