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RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near

To: "You, Yongkang" <yongkang.you@xxxxxxxxx>, Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Subject: RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus
From: "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>
Date: Thu, 7 May 2009 13:03:22 +0800
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Thread-topic: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus
It maybe related to recent DMA emulation changes in qemu, and lead to guest 
uses incorrect icache for instruction streams. 
Xiantao 

-----Original Message-----
From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of You, Yongkang
Sent: Thursday, May 07, 2009 12:57 PM
To: Isaku Yamahata
Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is 
near pcpus

On Thursday, May 07, 2009 10:22 AM Isaku Yamahata wrote:
> On Wed, May 06, 2009 at 01:54:15PM +0800, You, Yongkang wrote:
>> On  xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote:
>>> Hi,
>>> 
>>> When I try recently Xen (Xen 3.4 rc3) on IA64 machine
>>> (Tiger4), I found some strange issue.
>>> 
>>> My two systems have 4 and 8 pcpus separately
>>> 
>>> If VTI guest's vcpus is near pcpus, guest booting will meet some
>>> issues: 
>>> 1. Guest boot might be hang at "switch to new root and run
>>> init; unmounting old /dev ...; unmounting old /sys" for a long time.
> 
> Does this mean that it's unreasonably slow?

Em. It will stop there for a very long time (multi minutes). 

> And it reached login prompt eventually?

I tried many times, but didn't wait for login interface everytime. So couldn't 
say it would always reach login. 

Thanks,
Yongkang

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