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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: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Fri, 18 Dec 2009 08:42:13 +0000
Cc: Kurt Hackel <kurt.hackel@xxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>
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>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 18.12.09 08:02 >>>
>On 18/12/2009 04:36, "Mukesh Rathor" <mukesh.rathor@xxxxxxxxxx> wrote:
>> The other fix I thought of was to change INITIAL_JIFFIES to something
>> sooner.
>> Would appreciate any help, I don't understand xen time management well.
>This isn't really Xen time code, but unchanged Linux time code. I don't know
>which tree you quoted the code from -- 2.6.18 has similar but not identical.
>Anyway, I suggest try using the jiffy-comparison macros from
><linux/jiffies.h>: time_before(), time_after(), etc. These are designed to
>work even when jiffies wraps. Feel free to send patch(es) for that, if you
>test that out and it works okay.

But regardless of that - shouldn't the page scrubbing really be a
background operation these days, and as such be (relatively)
performance neutral to the booting of Dom0?


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