linux-kernel - Re: [GIT PATCH] another tranche of SCSI updates for 2.6.26

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Message-ID: <4815C1EC.7090109@panasas.com>
Date:	Mon, 28 Apr 2008 15:24:12 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PATCH] another tranche of SCSI updates for 2.6.26

On Mon, Apr 28 2008 at 15:13 +0300, James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> On Mon, 2008-04-28 at 10:23 +0300, Boaz Harrosh wrote:
>> If we are already on the subject. It looks like we always have at most 1 command in the 
>> free list, so why the free list at all? or am I reading the code wrong?
> 
> Because list handlers are well understood mechanisms within the kernel.
  This is not an excuse ;-). So is a simple pointer.
 
> Also because in low memory situations, one command per host is
> sufficient to guarantee forward progress, but it's not going to be very
> efficient.  Embedded and other low memory environments can increase the
> size of the free list to improve their I/O path.
> 

Ok that is what I thought, but inspecting the code, I can't find it. Is there
a config option or an external mechanism that let you do that? If not, is/was
there a ready made external patch that will enable such facility in someway?
Should there be one?

> James
> 

Boaz
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