linux-kernel - Re: [PATCH] x86: Use clflush() instead of wbinvd() whenever possible when changing mapping

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Message-ID: <20090730090747.GD1364@ucw.cz>
Date:	Thu, 30 Jul 2009 11:07:47 +0200
From:	Pavel Machek <pavel@....cz>
To:	Thomas Hellstrom <thellstrom@...are.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	venkatesh.pallipadi@...el.com
Subject: Re: [PATCH] x86: Use clflush() instead of wbinvd() whenever
	possible when changing mapping

On Fri 2009-07-24 09:53:01, Thomas Hellstrom wrote:
> The current code uses wbinvd() when the area to flush is > 4MB. Although this
> may be faster than using clflush() the effect of wbinvd() on irq
> latencies

You are slowing the kernel down, and you did not write down the
reasons. bad.

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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