Re: [Xen-devel] Question about PoD and Transcendent Memory for HVM

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> From: Kai Luo [mailto:luokain@xxxxxxxxx]
> Subject: [Xen-devel] Question about PoD and Transcendent Memory for HVM
> 
> Hi:
>       I am working at the source code of Xen 4.1.3 and have two questions 
> that confused me.
>       I remembered a mail of XCP-mail-list which said when a hvm is 
> created,xen allocate all memory it
> requests,which can guarantee the stability and Qos or something.However,when 
> I come into the part of
> memory source code,I tind the existance of PoD,which can adjust memory 
> dynamically,so I want to make
> sure whether the mechanism of memory management between XCP and Xen is 
> differrent,Xen can adjust the
> memory size of HVM dynamically instead of a fixed memory size,am I right?
>       I know the Transcendent Memory is a better techniche of memory reuse,is 
> it used in xen for HVM
> now?
>       Thank you for your answering!

Transcendent Memory works fine for HVM domains.  It does require
a tmem-capable guest kernel.  This requires a very recent distro
(and means tmem does not help Windows guests... though it does
co-exist with them).

Dan

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