linux-kernel - Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

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Date:	Wed, 27 Feb 2008 09:26:47 -0500
From:	Tony Battersby <tonyb@...ernetics.com>
To:	Andre Noll <maan@...temlinux.org>
Cc:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	adam radford <aradford@...il.com>,
	Johannes Wörner 
	<johannes.woerner@...bingen.mpg.de>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

Andre Noll wrote:
> Thanks, this helped a lot. However, there does not seem to be a way
> to make the system more responsive, which is really the problem we
> are experiencing.
>
> Andre
>   
This is not 3ware-specific, but kernel 2.6.24 has new per-device write
throttling that might help with the responsiveness issue:

http://kernelnewbies.org/LinuxChanges#head-92340ffcec39e7c2a09fd933243fb18eda57f1b4
http://lwn.net/Articles/245600/

Also, check to see if the 3ware controller has a background initialize
or verify in progress, since that will obviously slow things down until
it is complete.

Tony

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