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Re: [Xen-devel] [RFC PATCH 0/2] ASID: Flush by ASID

To: Wei Wang2 <wei.wang2@xxxxxxx>
Subject: Re: [Xen-devel] [RFC PATCH 0/2] ASID: Flush by ASID
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Wed, 12 Jan 2011 10:17:00 +0000
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At 17:55 +0000 on 11 Jan (1294768552), Wei Wang2 wrote:
> Future AMD SVM supports a new feature called flush by ASID. The idea is to 
> allow CPU to flush TLBs associated with the ASID assigned to guest VM. So 
> hypervisor doesn't have to reassign a new ASID in order to flush guest's 
> VCPU.  Please review it.

What advantage does the new system have?  Intuitively it seems like it
might be a tiny bit fairer and a tiny bit faster (by explicitly flushing
instead of relying on LRO) but I'm not convinced that it will be visible
in macro-benchmarks.  Have you measured it?



> Thanks,
> Wei
> Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
> Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
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Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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