Re: [Xen-devel] Live Migration Error

[Andres Lagar Cavilla <andreslc@xxxxxxxxxxxxxx>]

Hi Ian,
I got a fresh code image this morning. Live migration works fine, even 
after un-tweaking the timer back to its default value. I have tested, 
not necessarily thoroughly, but I haven't run into trouble yet. I guess 
this closes this chapter.
For whatever it may be worth, I have some comments regarding the 
"previous" (Friday May 13) xfrd version:
- Even though timeout increase would allow live migration to complete 
succesfully this was not always the case; there was actually a 50% 
chance of success.
- On all successful migrations, the number of skipped pages after the 
last iteration and before domain suspend was always zero:
Saving memory pages: iter 3   0%
3: sent 0, skipped 0,
3: sent 0, skipped 0, [DEBUG] Conn_sxpr>
(AndresNfsDomain 8)[DEBUG] Conn_sxpr< err=0
[1116255361.997192] SUSPEND flags 00020004 shinfo 00000beb eip c01068fe 
esi 0002de60
- On all failed migrations, there was a nonzero number of said skipped 
pages (sometimes 12, sometimes 4)
Hope this somehow helps.
Keep up the excellent work
Andres

Ian Pratt wrote:
>  
> > Teemu saves the day!!!
> > I actually set the timeout to 100 for no particular reason 
> > (originally it was 10, 20 didn't work either) Thanks Ian for 
> > your suggestion as well
> >    
> I'd be really surprised if increasing the timeout actually made a difference. 
> Are you sure you're not just using the shadow mode fix that was checked in a 
> couple of hours ago?
>
> Best,
> Ian
>
>  
> > Cheers!!
> > Andres
> > At 02:45 PM 5/13/2005, Teemu Koponen wrote:
> >    
> > > On May 13, 2005, at 20:07, Andres Lagar Cavilla wrote:
> > >
> > > Andres,
> > >
> > >      
> > > > I try to do a live migration in the same physical host, i.e. xm 
> > > > migrate --live 'whatever' localhost It fails with 'Error: errors: 
> > > > suspend, failed, Callbak timed out'.
> > > > It seems like transfer of memory pages works until the 
> > > >        
> > point when the 
> >    
> > > > domain needs to be suspended to do the final transfer. 
> > > >        
> > Funny thing is 
> >    
> > > > it used to work before, gloriously, and I haven't made any 
> > > > software/hardware changes. At some point a xm save command 
> > > >        
> > failed with 
> >    
> > > > timeout, and from there on live migration fails with this message. 
> > > > Non-live migration works perfectly, also between different physical 
> > > > hosts. save/restore also works flawlessly.
> > > >        
> > > I had similar timeout errors previously, when I was using a 
> > >      
> > bit slower 
> >    
> > > servers. I overcame the problem by slightly increasing the timeout 
> > > value in controller.py. It seemed to provide a remedy.
> > > Teemu
> > >
> > > --
> > >      
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> >    

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