linux-kernel - Re: [PATCH 2/4] fastboot: make scsi probes asynchronous

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Message-ID: <20090104101353.05e8df09@infradead.org>
Date:	Sun, 4 Jan 2009 10:13:53 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	mingo@...e.hu, fweisbec@...il.com, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-acpi@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 2/4] fastboot: make scsi probes asynchronous

On Sun, 4 Jan 2009 11:05:15 -0700
Matthew Wilcox <matthew@....cx> wrote:

> On Sun, Jan 04, 2009 at 09:29:40AM -0800, Arjan van de Ven wrote:
> > >From 2087b546abddced50fa73ea9a71b5a040ae1026e Mon Sep 17 00:00:00
> > >2001
> > From: Arjan van de Ven <arjan@...ux.intel.com>
> > Date: Sun, 4 Jan 2009 05:32:28 -0800
> > Subject: [PATCH] fastboot: make scsi probes asynchronous
> > 
> > This patch makes part of the scsi probe (which is mostly device
> > spin up and the partition scan) asynchronous. Only the part that
> > runs after getting the device number allocated is asynchronous,
> > ensuring that device numbering remains stable.
> 
> Is this really a big win?  Were you using the async scsi scan code
> already? 

just checked;
my box has CONFIG_SCSI_SCAN_ASYNC=y set for both cases
it seems to be about 0.1 seconds win still though...
sounds little, but a kernel boot should be less than a second, so that
is still 10%. And it's obviously also disk dependent..
(I used libata connected disks obviously)



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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