From: Gleb Natapov <gleb@redhat.com>
To: Chegu Vinod <chegu_vinod@hp.com>
Cc: kvm@vger.kernel.org
Subject: Re: Networking performance on a KVM Host (with no guests)
Date: Thu, 19 Apr 2012 08:43:06 +0300 [thread overview]
Message-ID: <20120419054306.GV11918@redhat.com> (raw)
In-Reply-To: <loom.20120419T053941-656@post.gmane.org>
On Thu, Apr 19, 2012 at 03:53:39AM +0000, Chegu Vinod wrote:
>
> Hello,
>
> Perhaps this query was answered in the past. If yes kindly point me to
> the same.
>
> We noticed differences in networking performance (measured via netperf
> over a 10G NIC) on an X86_64 server between the following two
> configurations :
>
> 1) Server run as a KVM Host (but with no KVM guests created on it (or) no
> extra bridges created other than the default vibr0 bridge)
>
> vs.
>
> 2) The same server running the same version of Linux but without any of the
> virtualization software installed on it.
>
> Config #2 performed much better !
> Is this expected ? What are the reasons behind this ?
>
> Is there any way to gain back the loss in performance on the KVM host
> without having to uninstall the virtualization software (i.e. in Config 1).
>
Can you list exactly what you need to uninstall to get performance back?
--
Gleb.
next prev parent reply other threads:[~2012-04-19 5:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 3:53 Networking performance on a KVM Host (with no guests) Chegu Vinod
2012-04-19 5:43 ` Gleb Natapov [this message]
2012-04-19 6:42 ` Jean-Philippe Menil
2012-04-20 14:15 ` Chegu Vinod
2012-04-20 19:35 ` Nadav Har'El
2012-04-21 0:30 ` Chegu Vinod
2012-04-22 11:09 ` Nadav Har'El
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