linux-kernel - Re: [RFC PATCH] C2 could be mapped to C3 so need a flush cache

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Message-ID: <20090908013240.51e39d1e@infradead.org>
Date:	Tue, 8 Sep 2009 01:32:40 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Luming Yu <luming.yu@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: Re: [RFC PATCH] C2 could be mapped to C3 so need a flush cache

On Tue, 8 Sep 2009 16:20:52 +0800
Luming Yu <luming.yu@...il.com> wrote:

> > Do you have an example of a specific machine where this is fscked
> > up? (if so, it's blacklist worthy.. probably worth blacklisting just
> > outright doing C states on it)
> 
> Those boxes that have c2 lapic timer stop issue is supposed to need
> this patch. But I don't have such kind of system. So test and
> comments are needed by those who actually have such kind of box.

I find that highly unlikely; this software cache flush codepath hasn't
applied to any CPU sold in the last few years....


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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