Re: [Xen-devel] [PATCH] x86/EPT: flush cache when (potentially) limiting cachability

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-06-12 at 01:28 +0000, Liu, SongtaoX wrote:
> 
> > -----Original Message-----
> > From: Jan Beulich [mailto:jbeulich@xxxxxxxx]
> > Sent: Friday, May 30, 2014 7:20 PM
> > To: Liu, SongtaoX; xen-devel@xxxxxxxxxxxxxxxxxxxx
> > Cc: Dong, Eddie; Nakajima, Jun; Tian, Kevin; Pang, LongtaoX; Hu, Robert; 
> > Zhang,
> > Yang Z; keir@xxxxxxx; tim@xxxxxxx
> > Subject: Re: RE: [Xen-devel] [PATCH] x86/EPT: flush cache when (potentially)
> > limiting cachability
> > 
> > >>> "Liu, SongtaoX" <songtaox.liu@xxxxxxxxx> 05/30/14 9:35 AM >>>
> > >Sorry to update.
> > >The bug refers to
> > http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1887.
> > >L2 guest vnc console hangs at black screen with cursor flashing at the top 
> > >left
> > corner.
> > >After several minutes, the Seabios screen shows up, but the screen still 
> > >flush
> > slowly, the guest could not boot up.
> > 
> > That would then indeed be an indication of excessive flushes. I.e. you may 
> > want
> > to simply track down which one (and why) gets triggered too often.
> > 
> How to get that information? It is hard for me to do it since I am not
> a Xen expert. But if you can provide a patch help to debug, I would
> happy to do it.

Is this the sort of thing for which xentrace and xenalyze could be
useful?




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