linux-kernel - Re: CPA patchset

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Message-ID: <20080110100443.GB28209@elte.hu>
Date:	Thu, 10 Jan 2008 11:04:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	suresh.b.siddha@...el.com, Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: CPA patchset


* Andi Kleen <ak@...e.de> wrote:

> >   WBINVD isnt particular fast (takes a few msecs), but why is that a 
> >   problem? Drivers dont do high-frequency ioremap-ing. It's 
> >   typically only done at driver/device startup and that's it.
> 
> Actually graphics drivers can do higher frequency allocation of WC 
> memory (with PAT) support.

but that's not too smart: why dont they use WB plus cflush instead? 
ioremap() will always be slow and we dont care about stupid uses of it.

	Ingo
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