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Re: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB

To: Jan Beulich <JBeulich@xxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "mukesh.rathor@xxxxxxxxxx" <mukesh.rathor@xxxxxxxxxx>
Subject: Re: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB system
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 22 Dec 2009 15:19:49 +0000
Cc: "kurt.hackel@xxxxxxxxxx" <kurt.hackel@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 22/12/2009 14:23, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>>> "Jan Beulich" <JBeulich@xxxxxxxxxx> 22.12.09 15:17 >>>
>> There's another thing that seems inconsistent with this report: jiffies
>> itself as well as all the arithmetic in calibrate_delay_direct() is using
>> "unsigned long", so is being done 64-bit on x86-64 (which we're
>> talking about here). Hence I can see even less how an overflow could
>> have happened, or how using explicit 64-bit types (or get_jiffies_64())
>> here can help.
> Oh, or are we talking about 32-bit Dom0 on 64-bit Xen here? I don't
> recall this having been mentioned anywhere, but maybe I just
> overlooked it.

I'd assumed this must be the case. As you say, the issue couldn't happen as
described on 64-bit Linux.

 -- Keir

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