linux-kernel - Re: Linux 2.6.22-rc2

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Message-ID: <46532E44.4000701@zytor.com>
Date:	Tue, 22 May 2007 10:54:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	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

Linus Torvalds wrote:
> 
> 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..)
> 

The PCI latency counters matter as long as you're talking a PCI or PCI-X
bus.  It matters not one iota on anything that pretends to be a PCI bus
but isn't, i.e. PCI Express, HyperTransport, etc.

	-hpa
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