linux-kernel - Re: Performance/resume issues on Toshiba NB305

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Date:	Fri, 25 Feb 2011 16:29:00 -0600
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: Performance/resume issues on Toshiba NB305

On Fri, Feb 25, 2011 at 10:47:16PM +0100, Thomas Gleixner wrote:
> Let's wait for the intel and acpi folks. It would be interesting what
> the new intel toy says to your BIOS.
> 
>     http://biosbits.org/

Not much because it doesn't know about my processor. About all I could
get out of it is that my MSRs are inconsistent, SMI latency is bad, and
the round-trip latency via MWAIT test gives elapsed time = 285ms with
229 iterations/ms.

> > Then there must be a bug. When I cleared CLOCK_EVT_FEAT_ONESHOT for the
> > HPET without this change the HPET got put into oneshot mode. The local
> > tick device is checked before switching to nohz, but not the broadcast
> > device. This change was just a quick hack to get around that and test my
> > theory.
> 
> Indeed. The patch below should cure that.

It works. I was wondering whether or not I should put the broadcast
device in periodic mode with the local ones in nohz; I guess your patch
answers my question.

> 
> Thanks,
> 
> 	tglx
> 
> ----------->
> Subject: clockevents-fix-broadcast.patch
> From: Thomas Gleixner <tglx@...utronix.de>
> Date: Fri, 25 Feb 2011 22:34:23 +0100
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Tested-by: Seth Forshee <seth.forshee@...onical.com>

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