linux-kernel - Re: 64-bit DMA problems with BCM4312 using b43

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Message-ID: <20091113211306.GA6600@srcf.ucam.org>
Date:	Fri, 13 Nov 2009 21:13:06 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Michael Buesch <mb@...sch.de>, bcm43xx-dev@...ts.berlios.de,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 64-bit DMA problems with BCM4312 using b43

On Fri, Nov 13, 2009 at 03:05:18PM -0600, Larry Finger wrote:

> I'm in the process of creating a patch to set the latency to 200 usec. The
> default is 2000. On my fast prosessors, it should not be anything nearly that
> slow. If we determine this to be the problem, then we can try tuning.

The latency is the amount of time it takes to get out of deep C states 
and into C0. That's a function of the processor design rather than the 
frequency.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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