From: "Jan Beulich" <JBeulich@novell.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>, pasik@iki.fi
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: Xen max supported memory per guest VM?
Date: Mon, 16 Aug 2010 10:04:30 +0100 [thread overview]
Message-ID: <4C691B3E020000780000FFCF@vpn.id2.novell.com> (raw)
In-Reply-To: <C88CC6A3.1DDE6%keir.fraser@eu.citrix.com>
>>> On 14.08.10 at 23:18, Keir Fraser <keir.fraser@eu.citrix.com> wrote:
> On 14/08/2010 19:42, "Pasi Kärkkäinen" <pasik@iki.fi> wrote:
>
>> Hello,
>>
>> In http://wiki.xensource.com/xenwiki/Xen4.0 we mention the following:
>> "Better performance and scalability: 128 vcpus per guest, 1 TB of RAM per
>> host, 128 physical CPUs per host (as a default, can be compile-time increased
>> to lots more)."
>>
>> But what's the max supported amount of memory for a (64bit) guest?
>
> Allocating the whole 1TB should work. It's unlikely to have been tested
> though.
Not everything will work with more than 512G: Anything that wants
to access the guest's pfn_to_mfn_frame_list_list won't work, as
there's no specification of how more than a page worth of these top
level pointers should be expressed. Affected would be (afaict) save/
restore/migrate, kexec, and dumping of a crashed guest.
Jan
next prev parent reply other threads:[~2010-08-16 9:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-14 18:42 Xen max supported memory per guest VM? Pasi Kärkkäinen
2010-08-14 21:18 ` Keir Fraser
2010-08-14 21:30 ` Pasi Kärkkäinen
2010-08-14 21:46 ` Keir Fraser
2010-08-16 9:04 ` Jan Beulich [this message]
2010-08-16 9:18 ` Keir Fraser
2010-08-16 9:34 ` Pasi Kärkkäinen
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