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

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Message-ID: <20080227170528.GB29468@skl-net.de>
Date:	Wed, 27 Feb 2008 18:05:28 +0100
From:	Andre Noll <maan@...temlinux.org>
To:	Tony Battersby <tonyb@...ernetics.com>
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

On 09:26, Tony Battersby 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/

Yes, but we tried both 2.6.24 and 2.6.25-rc, so Peter's new
write-throttling code doesn't seem to help much in our situtation. I'll
play a bit with the various /proc/sys/vm/* knobs to see if that makes
the system more responsive.

> 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.

That's certainly not the case.

Thanks
Andre
-- 
The only person who always got his work done by Friday was Robinson Crusoe

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