From: Javier Guerra <javier@guerrag.com>
To: Bruce Rogers <brogers@novell.com>
Cc: kvm@vger.kernel.org
Subject: Re: kvm scaling question
Date: Fri, 11 Sep 2009 10:46:04 -0500 [thread overview]
Message-ID: <90eb1dc70909110846k1cd57f08oa67c92644d78c418@mail.gmail.com> (raw)
In-Reply-To: <4AAA1A0A0200004800080E06@novprvlin0050.provo.novell.com>
On Fri, Sep 11, 2009 at 10:36 AM, Bruce Rogers <brogers@novell.com> wrote:
> Also, when I did a simple experiment with vcpu overcommitment, I was surprised how quickly performance suffered (just bringing a Linux vm up), since I would have assumed the additional vcpus would have been halted the vast majority of the time. On a 2 proc box, overcommitment to 8 vcpus in a guest (I know this isn't a good usage scenario, but does provide some insights) caused the boot time to increase to almost exponential levels. At 16 vcpus, it took hours to just reach the gui login prompt.
I'd guess (and hope!) that having many 1- or 2-cpu guests won't kill
performance as sharply as having a single guest with more vcpus than
the physical cpus available. have you tested that?
--
Javier
next prev parent reply other threads:[~2009-09-11 15:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-11 15:36 kvm scaling question Bruce Rogers
2009-09-11 15:46 ` Javier Guerra [this message]
2009-09-14 23:12 ` Bruce Rogers
2009-09-11 21:53 ` Marcelo Tosatti
2009-09-11 23:02 ` Andre Przywara
2009-09-14 23:21 ` Bruce Rogers
2009-09-14 23:19 ` Bruce Rogers
2009-09-15 14:10 ` Andrew Theurer
2009-09-12 9:52 ` Proxmox VE 1.4beta1 released Martin Maurer
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