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Re: [Xen-devel] Xen 4.1 rc1 test report

To: Haitao Shan <maillists.shan@xxxxxxxxx>, "Zheng, Shaohui" <shaohui.zheng@xxxxxxxxx>
Subject: Re: [Xen-devel] Xen 4.1 rc1 test report
From: Keir Fraser <keir@xxxxxxx>
Date: Tue, 25 Jan 2011 08:43:04 +0000
Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 25/01/2011 06:24, "Haitao Shan" <maillists.shan@xxxxxxxxx> wrote:

>> Performance(1 bug)
>> 1. guest boot very slowly without limit dom0 cpu number on EX (Intel)
>> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1719
> This bug happened 1 year before. Keir has made a fix with c/s 20841,
> which essentially holds the locked (and hence allocated) hypercall
> page so that next hypercall can reuse it without doing alloc and mlock
> again. By doing this, overhead of rschedule IPI as a result of
> frequent mlock is greatly reduced.
> Late in year 2010, libxc introduced a new mechanism called hypercall
> buffers, as you can refer c/s 22288~22312. Keir's fix is dropped in
> this new framework. As a result, the bug appears again.
> Probably the new framework auther can pick up Keir's fix again?

Ian Campbell, I think (cc'ed).

 -- Keir

> Shan Haitao

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