linux-kernel - Re: 3ware disk latency?

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Message-ID: <20060727121137.GM1703@fi.muni.cz>
Date:	Thu, 27 Jul 2006 14:11:37 +0200
From:	Jan Kasprzak <kas@...muni.cz>
To:	dean gaudet <dean@...tic.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: 3ware disk latency?

dean gaudet wrote:
: my suspicion is the 3ware lacks any sort of "fairness" in its sharing of 
: buffer space between multiple units on the same controller.  and by 
: disabling the write caching it limits the amount of controller memory that 
: the busy disk can consume.

	Hmm, do you have a battery backup unit for 9550sx? I don't,
and the 3ware BIOS does not even allow me to enable write caching without it.
So I don't think the write caching on the controller side is related
to my problem.

	I have been able to improve the latency by upgrading the firmware
to the newest release (wow, they even have a firmware updating utility
for Linux!).

-Yenya

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
| GPG: ID 1024/D3498839      Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| http://www.fi.muni.cz/~kas/    Journal: http://www.fi.muni.cz/~kas/blog/ |
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