linux-kernel - RE: Kernel hangs in SMP + VMware environment.

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Date:	Thu, 15 May 2008 12:44:40 -0700
From:	Alok Kataria <akataria@...are.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
CC:	"devzero@....de" <devzero@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Hecht <dhecht@...are.com>
Subject: RE: Kernel hangs in SMP + VMware environment.

Hi Tetsuo,

Thanks for testing.

Actually it would be better to use clocksource=acpi_pm on kernels which don't have this patch, as ACPI_PM comes with many more featuers like hrtimers, nohz, etc.

On the other hand for kernels which have this patch attached,  it would be best to use TSC, for performance.

HTH,
Alok.

________________________________________
From: Tetsuo Handa [penguin-kernel@...ove.sakura.ne.jp]
Sent: Wednesday, May 14, 2008 11:11 PM
To: Alok Kataria
Cc: devzero@....de; linux-kernel@...r.kernel.org; Daniel Hecht
Subject: Re: Kernel hangs in SMP + VMware environment.

Hello.

Alok Kataria wrote:
> Can you try the patch attached with this mail, I made this on top of
> 2.6.24.7 but should fit on any other 2.6.24 based distro kernel.

I tried 2.6.24.5-85.fc8 with your patch, and I can no longer reproduce
this problem. I think the problem has been solved.

Also, workaround till your patch is applied to distro kernels seems to be
to add "clocksource=jiffies" or something to avoid using tsc as clocksource.
Fedora 9's 2.6.25-14.fc9 also hangs since the default clocksource is tsc, but
with "clocksource=jiffies" added, I encounter no hangs so far.

>From today, I can compile kernels using 2 CPUs.
Thank you very much.
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