linux-kernel - Re: Linux 2.6.22-rc2

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Message-ID: <20070522101926.481d3ec7@freepuppy>
Date:	Tue, 22 May 2007 10:19:26 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeff Garzik <jeff@...zik.org>, Mike Houston <mikeserv@...s.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.22-rc2

On Mon, 21 May 2007 22:04:26 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Mon, 21 May 2007, Stephen Hemminger wrote:
> >
> > AHCI on this motherboard doesn't seem to use MSI. The problems occur
> > even if I boot with nomsi.
> 
> Have you tried playing with PCI latency counters etc? 
> 
> Maybe the SATA/AHCI thing is better at saturating the bus, and the sky2 
> hardware gets upset if it has overlong DMA access latencies due to some 
> other controller keeping the bus busy with a long burst access?
> 
> I can't really see that being a real problem in this day and age of PCI-X 
> etc, but it _used_ to be a possible issue a decade ago. Maybe you've found 
> a case where it matters even on modern hardware? We occasionally used to 
> set the PCI latency timer to make people happy.
> 
> (Not that I'm convinced it even has any semantic meaning on a modern PCI 
> system..)
> 
> 		Linus

The device in question is PCI Express, and the latency has no meaning (at
least in vendor spec).

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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