RE: [Xen-devel] [PATCH][2/4] Enable 1GB for Xen HVM host page

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Not sure what your point is.  I was just suggesting that if
save/restore/migration doesn't work anyway, setting no_migrate
should result in a nicer error message than otherwise, and serves
as a clear "TO DO" marker for developers looking for a
"fun" project.

> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: Tuesday, February 23, 2010 11:10 AM
> To: Dan Magenheimer; Tim Deegan; Wei Huang
> Cc: Keir@xxxxxxxxxxxxxxxxxxxx; Xu, Dongxiao; xen-
> devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH][2/4] Enable 1GB for Xen HVM host page
> 
> The use of 1GB extents is just a (small-ish) performance win. If you
> can
> only back with 4kB or 2MB extents on the target host it doesn't matter
> that
> much.
> 
>  -- Keir
> 
> On 23/02/2010 17:19, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>
> wrote:
> 
> > I'll bet save/restore/migration for 1GB pages will be a fun
> challenge.
> >
> > At least please set the "no_migrate" flag automatically for
> > any domain that uses 1GB pages unless/until live migration
> > is supported.
> >
> >> -----Original Message-----
> >> From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx]
> >> Sent: Tuesday, February 23, 2010 6:01 AM
> >> To: Wei Huang
> >> Cc: Keir@xxxxxxxxxxxxxxxxxxxx; Xu, Dongxiao; xen-
> >> devel@xxxxxxxxxxxxxxxxxxx; Fraser
> >> Subject: Re: [Xen-devel] [PATCH][2/4] Enable 1GB for Xen HVM host
> page
> >>
> >> At 17:18 +0000 on 22 Feb (1266859100), Wei Huang wrote:
> >>> Change page allocation code in Xen tools. The allocation request
> now
> >>> starts with 1GB; if that fails, then falls back to 2MB and then
> 4KB.
> >>
> >> Can we have an equivalent patch for the save/restore path please?
> That
> >> took a while to catch up when 2MB superpages were introduced.
> >>
> >> Tim.
> >>
> >> --
> >> Tim Deegan <Tim.Deegan@xxxxxxxxxx>
> >> Principal Software Engineer, XenServer Engineering
> >> Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)
> >>
> >> _______________________________________________
> >> Xen-devel mailing list
> >> Xen-devel@xxxxxxxxxxxxxxxxxxx
> >> http://lists.xensource.com/xen-devel
> 
> 

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