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authorEd L. Cashin <ecashin@coraid.com>2008-02-08 04:20:07 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:32 -0800
commit7df620d852642d424afc9777fe57880e02c92832 (patch)
tree9bd0b23534c02f1a8adb3cc7972f4976a7148cb3 /drivers/block/aoe
parent6b9699bbd24e82d2ec3bb5a43100099a936ded04 (diff)
downloadop-kernel-dev-7df620d852642d424afc9777fe57880e02c92832.zip
op-kernel-dev-7df620d852642d424afc9777fe57880e02c92832.tar.gz
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>
Diffstat (limited to 'drivers/block/aoe')
-rw-r--r--drivers/block/aoe/aoecmd.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 7a96183..e92d885 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) {
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