From: Riccardo Veraldi <Riccardo.Veraldi@cnaf.infn.it>
To: Benjamin Schweikert <b.schweikert@googlemail.com>
Cc: kvm@vger.kernel.org, Andrea Chierici <andrea.chierici@cnaf.infn.it>
Subject: Re: Very bad Speed with Virtio-net
Date: Thu, 07 Jan 2010 12:21:56 +0100 [thread overview]
Message-ID: <4B45C3D4.8010800@cnaf.infn.it> (raw)
In-Reply-To: <4B45BCEA.1040709@googlemail.com>
I have similar results, like yours, using CentOS 5.4 x86_64
I do not think it is possible to gain more than this right now... or
better I wish it could be possible
If you can get better result please let me know
Rick
Benjamin Schweikert wrote:
> Hello everybody,
> this is my first post on a mailing list, so i hope everything works fine.
>
> My host is a AMD X2 4850e with a 64bit Gentoo (unstable). I have
> tested qemu-kvm 0.11, 0.12.x and the git version from the 6. jan.
> I created my own bridges, so i dont need the option from libvirt. I
> bridged a 1 Gb lan card for my VMs. When I use the virtio net driver,
> i get something about 200-300 mbit form my desktop to one if my VMs.
> If iI use the e1000 driver instead of the virtio I get about
> 500 - 600 mbit.
> I tested this with the following kernels:
> Host: 2.6.31.6, 2.6.32.1, 2.6.32.2
> Guests: 2.6.26, 2.6.30, 2.6.32 (debian)
> 2.6.32 (gentoo)
>
> Here is a default result, virtio vs. e1000:
>
> iperf -c 192.168.0.3 -w 512k -l 512k
> ------------------------------------------------------------
> Client connecting to 192.168.0.3, TCP port 5001
> TCP window size: 256 KByte (WARNING: requested 512 KByte)
> ------------------------------------------------------------
> [ 3] local 192.168.0.2 port 52968 connected with 192.168.0.3 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 438 MBytes 267 Mbits/sec
>
>
> iperf -c 192.168.0.3 -w 512k -l 512k
> ------------------------------------------------------------
> Client connecting to 192.168.0.3, TCP port 5001
> TCP window size: 256 KByte (WARNING: requested 512 KByte)
> ------------------------------------------------------------
> [ 3] local 192.168.0.2 port 52995 connected with 192.168.0.3 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 602 MBytes 505 Mbits/sec
>
> Any ideas what this could be? I attach a dmesg output of my host.
> Thx.
>
> Ben
next prev parent reply other threads:[~2010-01-07 11:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-07 10:52 Very bad Speed with Virtio-net Benjamin Schweikert
2010-01-07 11:21 ` Riccardo Veraldi [this message]
2010-01-08 20:10 ` Thomas Fjellstrom
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