From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: H Peter Anvin <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
thomas@linux-os.sc.intel.com,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: Add clflush before monitor for Intel 7400 series - v2
Date: Sat, 7 Feb 2009 14:02:45 +0000 [thread overview]
Message-ID: <20090207140245.1e91a88f@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20090207004728.GA17586@linux-os.sc.intel.com>
On Fri, 6 Feb 2009 16:47:29 -0800
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com> wrote:
>
>
> For Intel 7400 series CPUs, the recommendation is to use a clflush on the
> monitored address just before monitor and mwait pair [1]. This clflush makes
> sure that there are no false wakeups from mwait when the monitored address
> was recently written to.
Given our mwait usages will very quickly go back to sleep in such a case
and it would almost certainly be one sleep only is this really worth the
effort ?
next prev parent reply other threads:[~2009-02-07 14:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-07 0:47 Pallipadi, Venkatesh
2009-02-07 14:02 ` Alan Cox [this message]
2009-02-07 16:47 ` Pallipadi, Venkatesh
2009-02-09 5:53 ` Nick Piggin
2009-02-09 21:37 ` Pallipadi, Venkatesh
2009-02-07 0:52 Pallipadi, Venkatesh
2009-02-09 10:15 ` Ingo Molnar
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