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

["Liu, SongtaoX" <songtaox.liu@xxxxxxxxx>]

> -----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.

> >For the good point(L0 git:06bbcaf48d09c18a41c482866941ddd5d2846b44),
> the L2 rhel_x64 could boot up less in than 90s.
> 
> Not sure what you're meaning to tell us here.
> 
I want to say the L2 guest boot up within less than 90s in good case, just for 
comparison. 

Regards
Songtao

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