linux-kernel - Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade

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Message-ID: <20090122195558.GA21118@elte.hu>
Date:	Thu, 22 Jan 2009 20:55:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Miklos Vajna <vmiklos@...galware.org>
Cc:	john stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Gabriel C <nix.or.die@...glemail.com>,
	CSÉCSY László <boobaa@...galware.org>
Subject: Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade


* Miklos Vajna <vmiklos@...galware.org> wrote:

> On Wed, Jan 21, 2009 at 01:34:06PM -0800, john stultz <johnstul@...ibm.com> wrote:
> > Miklos: Can you try bisecting this down some?
> 
> I did it two times when I finally realised that it depends on the
> config. So currently I have two config files, with "-good" the clock is
> fine, with "-bad" it's too fast.
> 
> Of course the diff contains unrelated changes as well, I'm trying to 
> find which one is the problematic one.

these look suspect in the good->bad diff:

 # CONFIG_X86_VOYAGER is not set
 # CONFIG_X86_GENERICARCH is not set
 # CONFIG_X86_VSMP is not set
-# CONFIG_X86_VISWS is not set
-# CONFIG_X86_RDC321X is not set
+CONFIG_X86_VISWS=y
+CONFIG_X86_RDC321X=y
 CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
-# CONFIG_PARAVIRT_GUEST is not set
+CONFIG_PARAVIRT_GUEST=y
+# CONFIG_VMI is not set
+CONFIG_KVM_CLOCK=y
+CONFIG_KVM_GUEST=y
+CONFIG_LGUEST_GUEST=y
+CONFIG_PARAVIRT=y
+CONFIG_PARAVIRT_CLOCK=y
+# CONFIG_PARAVIRT_DEBUG is not set
 CONFIG_MEMTEST=y

	Ingo
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