linux-kernel - Re: 2.6.24.X: SATA/AHCI related boot delay.

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Message-ID: <20080321104237.72379e41@core>
Date:	Fri, 21 Mar 2008 10:42:37 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	osb972ww-linuxczmil@...oo.com
Cc:	Tejun Heo <htejun@...il.com>, linux-kernel@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3

On Thu, 20 Mar 2008 20:04:13 -0700 (PDT)
osb972ww-linuxczmil@...oo.com wrote:

> 
> HI Tejun,
> 
>   setting irqpoll fixed both problems, and there are no "nasty grams" in dmesg now.   The original reason I was trying to use the hdparm -u on /dev/sda was because it was hanging for a few seconds when doing writes to the CFdisk, and in the past that was the kind of thing that hdparm -u would generally fix.   Now with the irqpoll kernel option, the /dev/sdb SATA drive was found, and I can mount it and write to it.  The CFcard /dev/sda is also responding to writes better than before.
> 
> Thanks for the suggestion to use irqpoll.    What is the problem within the driver(s) that is requiring irqpoll. ?

irqpoll works around BIOS bugs not driver bugs (well generally speaking
anyway).

Alan
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