Re: [Xen-devel] user-land tool for memory paging and memory sharing

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Jun 29, 2010 at 11:39:15AM -0700, Patrick Colp wrote:
> I've never tried the sharing code, so I can't speak for it. For
> swapping, it's only for HVM guests, however as far as I know, you can
> currently only page out one guest at a time (this is clearly something
> that we'd like to fix, although this is likely to happen after the new
> mem-event interface is established). In theory with swapping, you can
> remove most of the guest's allocated memory, however the more pages
> that are swapped out, the slower it runs. Grzegorz should be able to
> provide more information about sharing.
> 

Does this thread help?:
http://lists.xensource.com/archives/html/xen-devel/2010-04/msg00373.html

-- Pasi

> 
> Patrick
> 
> 
> On 29 June 2010 11:34, Ky Srinivasan <ksrinivasan@xxxxxxxxxx> wrote:
> >
> >
> >>>> On 6/29/2010 at  1:37 PM, in message
> > <AANLkTikTMxl8PncfXcOGKBphVvGW6_lNhdP1M_qPUsjX@xxxxxxxxxxxxxx>, Patrick Colp
> > <pjcolp@xxxxxxxxx> wrote:
> >> I'm not aware of any formal documentation on either of these things.
> >>
> >> I would imagine that there are still some issues with both sharing and
> >> paging that may not make it suitable for enterprise use. Of course, if
> >> anybody would like to stress test them in "real-world" scenarios and
> >> report any problems encountered (or patches), that would be greatly
> >> appreciated. Certainly with the upcoming changes to the mem-event
> >> interface, there are likely to be new bugs/issues introduced as well,
> >> so it would seem reasonable to not want to rely too much on either
> >> feature until that is a bit more solidified.
> >
> > Thanks Patric. I am interested in testing these features and I was looking 
> > for some documentation to get me started here. Is there a known list of 
> > problems/shortcomings in the code as it stands today. Is this feature only 
> > for HVM guests? In your tests, what levels of memory over-commitment were 
> > you able to achieve.
> >
> > Regards,
> >
> > K. Y
> >>
> >>
> >> On 29 June 2010 10:11, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:
> >>> +1... and in fact, my earlier question was never answered
> >>> so let me ask it more bluntly...
> >>>
> >>> Do these features work reliably today on 4.0.x, e.g. well
> >>> enough for an enterprise environment rather than just
> >>> as a demo?  Or are there known features/corner cases
> >>> that are missing today (that the discussion on mem-event
> >>> is perhaps intended eventually to rectify)?
> >>>
> >>>> -----Original Message-----
> >>>> From: Ky Srinivasan [mailto:ksrinivasan@xxxxxxxxxx]
> >>>> Sent: Tuesday, June 29, 2010 10:58 AM
> >>>> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> >>>> Subject: [Xen-devel] user-land tool for memory paging and memory
> >>>> sharing
> >>>>
> >>>> Is there any documentation on these features.
> >>>>
> >>>> Thanks,
> >>>>
> >>>> K. Y
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Xen-devel mailing list
> >>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
> >>>> http://lists.xensource.com/xen-devel
> >>>
> >>>
> >
> >
> >
> 
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> http://lists.xensource.com/xen-devel

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