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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

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)
>> 
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>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel



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