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Re: [Xen-devel] RE: [PATCH] rendezvous-based local time calibration WOW!

from [Keir Fraser] [Permanent Link][Original]
To: John Levon <levon@xxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] RE: [PATCH] rendezvous-based local time calibration WOW!
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Mon, 11 Aug 2008 15:46:10 +0100
Cc: "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Nils Nieuwejaar <nils.nieuwejaar@xxxxxxxxx>, Dave Winchell <dwinchell@xxxxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
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User-agent: Microsoft-Entourage/11.4.0.080122 
On 11/8/08 15:43, "John Levon" <levon@xxxxxxxxxxxxxxxxx> wrote:

>> Depending on how critical this guarantee is, I wouldn't rely on Xen to
>> perform perfectly. Probably you should keep your lock.
> 
> Or maybe make it optional, and let people turn it on when VCPUs are
> pinned (VCPU migration doesn't make much sense to me for server
> workloads AFAICS).
> 
> That lock is *painful*.

What guarantee are you providing? Per thread, per address space, or global
monotonicity?

 -- Keir



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