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

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Date:	Fri, 16 May 2008 18:22:52 -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.

________________________________________
From: Tetsuo Handa [penguin-kernel@...ove.SAKURA.ne.jp]
Sent: Friday, May 16, 2008 5:48 AM
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:
> 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.
I see. Thanks.

I'm not sure, but this problem might exist in all kernels since 2.6.18 , for
I can find clocksource= parameter in Documentation/kernel-parameters.txt .

ANK> Sorry, but I dont understand what you are pointing to, the 2.6.18 kernel does
ANK> have clocksource parameter.
ANK> And you are correct this could be a problem with all the kernels which are
ANK> using clocksource.

I didn't experience this problem in earlier kernels (e.g. 2.6.20)
since I was running only 1 VMware guest at a time.

Today I ran 2 VMware guests simultaneously (one with kernel 2.6.22 and
the other with kernel 2.6.18, both are assigned 2 virtual CPUs) and I encountered
may-be-hanged-up with the 2.6.18 one.

ANK> If you are able to reproduce this with any of the kernels with the patch applied
ANK> Please let me know.

Thanks,
Alok

The Ctrl-C didn't work, the Alt-F? didn't work, the Ctrl-Alt-Del didn't work.
I had no time to reproduce it, so I'm not sure it has actually hanged up.

Regards.
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