linux-kernel - Re: [PATCH 10/12] add module parameter for users who need more outstanding I/O

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Message-Id: <20070702214100.ed81e921.akpm@linux-foundation.org>
Date:	Mon, 2 Jul 2007 21:41:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Ed L. Cashin" <ecashin@...aid.com>
Cc:	linux-kernel@...r.kernel.org, Greg K-H <greg@...ah.com>
Subject: Re: [PATCH 10/12] add module parameter for users who need more
 outstanding I/O

On Tue, 26 Jun 2007 14:50:12 -0400 "Ed L. Cashin" <ecashin@...aid.com> wrote:

> Add module parameter for users who need more outstanding I/O.
> 

why?

I assume that there is some performance benefit to permitting some more
outstanding IO, but that's just a wild guess.

Assuming that the guess is right, some explanation of the effects of
altering this tunable would be appropriate.


> ---
>  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 8d6540b..9de0024 100644
> --- a/drivers/block/aoe/aoecmd.c
> +++ b/drivers/block/aoe/aoecmd.c
> @@ -17,6 +17,11 @@ 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)
>  {
> @@ -967,7 +972,6 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
>  	struct aoeif *ifp;
>  	ulong flags, sysminor, aoemajor;
>  	struct sk_buff *sl;
> -	enum { MAXFRAMES = 16 };
>  	u16 n;
>  
>  	h = aoe_hdr(skb);
> @@ -992,8 +996,8 @@ 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) {
> -- 
> 1.5.2.1
> 
> -
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