linux-kernel - Re: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

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Date:	Mon, 7 Jan 2008 14:12:59 -0500
From:	Len Brown <lenb@...nel.org>
To:	Mark Lord <lkml@....ca>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Arjan van de Ven <arjan@...radead.org>, abelay@...ell.com,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, rjw@...k.pl
Subject: Re: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

1. Why does VMware need max_cstate=1 to load quickly?
   It should not, and the fact that it does means
   that something somewhere is seriously broken.

2. Why does the "max_csate=1" workaround help only
   on the dual-core boxes, while the single-core
   boxes still fail to load quickly?

I'm glad that we deleted run-time access to max_cstate --
it seems to have exposed a real bug that needs fixing
and has gone unreported until now.

Indeed, when the real bug is fixed, I propose that
we again move to delete max_cstate as a run-time API.

-Len
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