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Re: [Xen-devel] [PATCH] Adjust time init sequence

To: Jan Beulich <jbeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] Adjust time init sequence
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 12 Dec 2008 10:38:16 +0000
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 12/12/2008 10:10, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> How about rdtscll(t->local_tsc_stamp) at the top of init_xen_time(), and
>> remove the one I added to early_time_init()? That would allow NOW() usage at
>> least in init_xen_time(), and be later than the TSC reset.
> 
> Perhaps it should be considered to switch to the non-resetting
> synchronization logic in x86-64 Linux up to 2.6.20 (according to the
> comments there derived from ia64), or even the current version that
> doesn't re-write the TSC at all?

Quite agreeable, albeit a bigger patch. ;-)

 -- Keir



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