From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miguel Araujo Subject: Re: virtual machines network goes 100Mbit when interface is Gbit Date: Thu, 03 Apr 2008 11:27:58 +0200 Message-ID: <47F4A31E.30501@Nosys.net> References: <47DA819D.3050907@Nosys.net> <47DA9839.7080607@gmail.com> <47EB7DC8.5010804@Nosys.es> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1661797848==" Cc: lista kvm-devel To: Victor Abeytua Garcia Return-path: In-Reply-To: <47EB7DC8.5010804@Nosys.es> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org This is a multi-part message in MIME format. --===============1661797848== Content-Type: multipart/alternative; boundary="------------070303010500040206010305" This is a multi-part message in MIME format. --------------070303010500040206010305 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Hello all, Thanks for your answer Haydn, but I did not understand the issue too.=20 Victor has explained my problem clearly, is kvm uncapable of running the=20 bridge at 1GBit if it is not a e1000 network card? Thanks a lot in advanced, Miguel > Hello, > I'm not sure if I understand you. Do you mean that the physical > network cards should be e1000 or that the virtual machines must somehow > emulate e1000 network cards? > > As I understand Miguel's post, he is finding an issue with the > bridge's speed (two virtual machines running on the same physical > machine are limited to 100 Mbps between themselves). > > Best regards, > V=EDctor > > > Haydn Solomon escribi=F3: > =20 >> What emulated nic are you using? I think only the e1000 emulated nic=20 >> supports 1 GB. >> >> Miguel Araujo wrote: >> =20 >> =20 >>> Hello all, >>> >>> I'm testing the last kvm version, 62. I was doing an iperf benchmark = to=20 >>> test the network performance in a Feisty virtual machine and I got=20 >>> values surround 100Mbits when my card is actually 1Gbit. The testing= =20 >>> environment is conformed by 2 machines, both with Gbit interfaces. Th= e=20 >>> vm in kvm is running in server mode, the other (not virtualized one) = is=20 >>> the client. The vm interface is going to a bridge called br0. Ethtool= =20 >>> says the interface is running 100Mbits but it doesn't let me change t= he=20 >>> speed or any other parameter in the vm. >>> >>> I can't either change tap0 parameters in kvm host. =BFIs anyone havin= g the=20 >>> same issue?=BFam I forgetting something? >>> >>> Thanks for your time in advanced, >>> Miguel >>> >>> ---------------------------------------------------------------------= ---- >>> This SF.net email is sponsored by: Microsoft >>> Defy all challenges. Microsoft(R) Visual Studio 2008. >>> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >>> _______________________________________________ >>> kvm-devel mailing list >>> kvm-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/kvm-devel >>> =20 >>> =20 >>> =20 >> >> ----------------------------------------------------------------------= --- >> This SF.net email is sponsored by: Microsoft >> Defy all challenges. Microsoft(R) Visual Studio 2008. >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ >> _______________________________________________ >> kvm-devel mailing list >> kvm-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/kvm-devel >> =20 >> =20 > > > =20 --------------070303010500040206010305 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hello all,

Thanks for your answer Haydn, but I did not understand the issue too. Victor has explained my problem clearly, is kvm uncapable of running the bridge at 1GBit if it is not a e1000 network card?

Thanks a lot in advanced,
Miguel
Hello,
    I'm not sure if I understand you. Do you mean that the physical
network cards should be e1000 or that the virtual machines must somehow
emulate e1000 network cards?

    As I understand Miguel's post, he is finding an issue with the
bridge's speed (two virtual machines running on the same physical
machine are limited to 100 Mbps between themselves).

    Best regards,
    Víctor


Haydn Solomon escribió:
  
What emulated nic are you using? I think only the e1000 emulated nic 
supports 1 GB.

Miguel Araujo wrote:
  
    
Hello all,

I'm testing the last kvm version, 62. I was doing an iperf benchmark to 
test the network performance in a Feisty virtual machine and I got 
values surround 100Mbits when my card is actually 1Gbit.  The testing 
environment is conformed by 2 machines, both with Gbit interfaces. The 
vm in kvm is running in server mode, the other (not virtualized one) is 
the client. The vm interface is going to a bridge called br0. Ethtool 
says the interface is running 100Mbits but it doesn't let me change the 
speed or any other parameter in the vm.

I can't either change tap0 parameters in kvm host. ¿Is anyone having the 
same issue?¿am I forgetting something?

Thanks for your time in advanced,
     Miguel

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