From: "Jan Beulich" <JBeulich@novell.com>
To: "Martin Lukasik" <martin.lukasik@cancer.org.uk>,
"Pasi Kärkkäinen" <pasik@iki.fi>
Cc: xen-devel@lists.xensource.com
Subject: Re: Xen CPU limit?
Date: Tue, 30 Mar 2010 08:16:26 +0100 [thread overview]
Message-ID: <4BB1C16A0200007800037BB9@vpn.id2.novell.com> (raw)
In-Reply-To: <20100329154901.GE1878@reaktio.net>
>>> Pasi Kärkkäinen<pasik@iki.fi> 29.03.10 17:49 >>>
>I think the number of virtual cpus (vcpus) per guest is (was) 32,
>and now in Xen 4.0.0 you can have up to 64 vcpus per guest.
I don't think the tools are up to anything beyond 32 yet. The (64-bit)
hypervisor allows up to 8192 vCPU-s iirc (but that's a truly
theoretical limit, as Dom0 or a guest likely won't be able to bring up
that many due to there only being 4096 event channels; current
Linux requires 5-6 of them per vCPU for IPIs and timer vIRQ).
Jan
next prev parent reply other threads:[~2010-03-30 7:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-11 16:08 Xen CPU limit? Martin Lukasik
2010-03-29 15:49 ` Pasi Kärkkäinen
2010-03-30 7:16 ` Jan Beulich [this message]
2010-03-30 7:53 ` Pasi Kärkkäinen
2010-03-30 8:56 ` Jan Beulich
2010-03-30 16:14 ` Dan Magenheimer
2010-03-31 7:11 ` Jan Beulich
2010-03-30 9:16 ` Martin Lukasik
2010-03-30 9:23 ` Keir Fraser
2010-03-30 9:26 ` Pasi Kärkkäinen
2010-03-30 9:32 ` Martin Lukasik
2010-03-30 9:39 ` Pasi Kärkkäinen
2010-03-30 9:43 ` Keir Fraser
2010-03-29 16:00 ` Jan Beulich
2010-03-29 16:03 ` Martin Lukasik
2010-03-29 16:17 ` Jan Beulich
2010-03-29 16:27 ` Keir Fraser
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