linux-kernel - Re: htpt366 PCI latency value is really high

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Message-ID: <463345B1.1070600@ru.mvista.com>
Date:	Sat, 28 Apr 2007 17:01:37 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Mike Mattie <codermattie@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: htpt366 PCI latency value is really high

Hello.

Alan Cox wrote:

>>There are many reasons a card would default to a higher level, but in
>>the end it is basically tuning the card for a server application.

>>A warning that some cards default to high PCI latency values; settings that 
>>can interfere with latency sensitive devices such as sounds cards - this 
>>could be a help to others.  

> A warning that there are quite a few cards that subtly corrupt your data
> if you don't have the latency set to values to work around chip errata is
> also worth making.

> You fiddle with PCI latency values at your peril, and preferably with the
> data sheet and errata docs to hand.

   And I don't have the latter for the HighPoint chips. Not sure if anybody ever had it. :-)

> Alan

MBR, Sergei
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