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

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB system
From: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Date: Mon, 21 Dec 2009 15:40:03 -0800
Cc: Hackel <kurt.hackel@xxxxxxxxxx>, Kurt, "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
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On Mon, 21 Dec 2009 10:44:51 +0000
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:

> On 19/12/2009 04:43, "Mukesh Rathor" <mukesh.rathor@xxxxxxxxxx> wrote:
> > Ok, I came up with the following patch. Jeremy, can you please take
> > a look also, and comment on my fix since I noticed you've got the
> > same issue in your tree. Here's a summary for your benefit:
> This patch doesn't apply to
> http://xenbits.xensource.com/linux-2.6.18-xen.hg by the way. The code
> is different there. So I'm dropping this patch as I have nowhere to
> put it.
>  -- Keir

Actually, INITIAL_JIFFIES appears to be buggy on 64bit linux:

#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))

The casting to uint makes it still 0xfffedb08 instead of 
0xfffffffffffedb08 which is what the intention is, that jiffies should
wrap in few minutes. So, if they fix it in linux in future, my
patch will still have the same problem. 

Ok, I'll come up with another patch.


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