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

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Date:	Mon, 7 Jan 2008 17:43:03 -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

On Monday 07 January 2008 16:33, Mark Lord wrote:
> Len Brown wrote:
> > 1. Why does VMware need max_cstate=1 to load quickly?
> ..
> 
> Eh?  Nothing to do with "loading" anything,
> but rather it's simple responsiveness to guest keyboard
> input that we're experiencing trouble with.
> The guest OS is probably "broken" in that regard,
> but setting max_cstate=1 makes it usable here.

okay, then when vmware is loaded, but idle, please run powertop
http://www.lesswatts.org/projects/powertop

and report what you see for C-states, P-states
and wakeup sources.


> > 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?
> ..
> 
> Eh?  Setting max_cstate=1 helps on both single/dual core
> boxes/kernels here.  The alternative (newer) latency thing
> (that requires a custom kernel module to change on the fly)
> is the thing that had no effect at all on our single-core box,
> but did seem to help the dual-core more (not verified completely
> on dual-core though).

please report the contents of 
cat /proc/acpi/processor/CPU*/power
for both systems when the C-states are not limited.

what latency limit did you specific to the latency I/F?

thanks,
-Len
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