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Date: Fri, 7 Dec 2007 12:48:08 -0500 From: "Ed L. Cashin" <ecashin@...aid.com> To: linux-kernel@...r.kernel.org Cc: "Ed L. Cashin" <ecashin@...aid.com>, Greg KH <greg@...ah.com> Subject: [PATCH 10/13] 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@...aid.com> --- 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 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) { -- 1.5.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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