From: Pavel Machek <pavel@ucw.cz>
To: Thomas Hellstrom <thellstrom@vmware.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
venkatesh.pallipadi@intel.com
Subject: Re: [PATCH] x86: Use clflush() instead of wbinvd() whenever possible when changing mapping
Date: Thu, 30 Jul 2009 11:07:47 +0200 [thread overview]
Message-ID: <20090730090747.GD1364@ucw.cz> (raw)
In-Reply-To: <1248421981-31865-1-git-send-email-thellstrom@vmware.com>
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.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-08-02 12:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-24 7:53 [PATCH] x86: Use clflush() instead of wbinvd() whenever possible when changing mapping Thomas Hellstrom
2009-07-24 10:05 ` Andi Kleen
2009-07-24 10:21 ` Thomas Hellstrom
2009-07-24 10:58 ` Andi Kleen
2009-07-24 11:14 ` Thomas Hellstrom
2009-07-24 13:16 ` Andi Kleen
2009-07-30 9:07 ` Pavel Machek [this message]
2009-08-02 16:22 ` Thomas Hellström
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