Message-ID: <47C57327.6070901@cybernetics.com>
Date: Wed, 27 Feb 2008 09:26:47 -0500
From: Tony Battersby <tonyb@cybernetics.com>
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To: Andre Noll <maan@systemlinux.org>
Cc: Arnd Hannemann <hannemann@nets.rwth-aachen.de>,
       adam radford <aradford@gmail.com>,
       =?ISO-8859-1?Q?Johannes_W=F6rner?= 
	<johannes.woerner@tuebingen.mpg.de>,
       James Bottomley <James.Bottomley@HansenPartnership.com>,
       linux-scsi <linux-scsi@vger.kernel.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3
References: <20080226174314.GA30767@skl-net.de> <47C49B99.1060707@nets.rwth-aachen.de> <20080227101154.GD30767@skl-net.de>
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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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