On Mon, Sep 06, 2010 at 02:58:32PM +0800, ma qiang wrote:
> Sorry, I lost two words.
> I reboot in bare linux not dom0, and have tested it on the same computer
> using only one network card. the results show 1000M.
>
So what do you get from xen dom0?
Also if your guest is HVM, have you installed PV-on-HVM drivers?
without those drivers the performance will be bad from the guest.
-- Pasi
> On Mon, Sep 6, 2010 at 2:57 PM, ma qiang <[1]maqiang1984@xxxxxxxxx> wrote:
>
> 20% is the vm's utilization of cpu, not dom0's.
> My domU is hvm and centos linux.
> "test server" is OK, and I have tested is on the same computer using
> only one network card. the results show 1000M.
>
> On Mon, Sep 6, 2010 at 2:50 PM, Pasi Kärkkäinen <[2]pasik@xxxxxx> wrote:
>
> On Mon, Sep 06, 2010 at 02:44:59PM +0800, ma qiang wrote:
> > > Do you mean 250 Mbit/sec ?
> > Yes.
> > > You should get much more.. how are you measuring the
> performance?
> > > What benchmark are you using?
> > I use an tool from ixia to test the network in the vm.
>
> Try using some standard network performance testing tools
> such as "iperf" or just regular ftp file transfers.
> > > Are both the eth0 and eth1 connected to the same network/vlan?
> > Yes. I run my test from another computer to connect to vm0 and
> vm1, and
> > they all in the same switch.
> > To be noted my cards are both 1000m network card.
> >
>
> How is the 'test server' connected?
>
> > > When you run the network benchmark try running "xm top"
> > > to monitor the overall cpu usage.. also run "top" in dom0
> > > to see if there's a big cpu usage in dom0.
> > No, the cpu is less than 20%
>
> 20% on dom0?
> How about the domUs? Do they have big cpu usage?
>
> What kind of guests do you have? pv? hvm? linux? windows?
>
> -- Pasi
> > On Mon, Sep 6, 2010 at 2:08 PM, Pasi Kärkkäinen
> <[1][3]pasik@xxxxxx> wrote:
> > > On Mon, Sep 06, 2010 at 01:58:10PM +0800, ma qiang wrote:
> > >> Hi all,
> > >> I have install xen 3.4.3 based on centos5.4.
> > >> I changed a line in /etc/xen/xend-config.sxp like below:
> > >> (network-script network-bridge) ----> (network-script
> > my-network-bridge)
> > >>
> > >> and #cat /etc/xen/scripts/my-network-script prints as below:
> > >> #!/bin/sh
> > >> /etc/xen/scripts/network-bridge "$@" netdev=eth0 bridge=eth0
> > >> /etc/xen/scripts/network-bridge "$@" netdev=eth1 bridge=eth1
> > >>
> > >> Now I installed two vms, and set one vm using eth0, then set
> the other
> > >> using eth1.
> > >> So, I can connect internet in both vms.
> > >>
> > >> But now my problem is that the throughput of two network card
> is the
> > >> same as only one network card.
> > >> Another words, If I use the only one network card such as eth0
> for the
> > >> two vms, the throughput of eth0 is about 250m.
> > >> But when I set one vm use eth0 and the other use eth1, the
> total
> > >> throughput of eth0 and eth1 is about 250m too.
> > >>
> > >> That why? Any bottleneck?
> > >> Thanks a lot.
> > >>
> > >
> > > Do you mean 250 Mbit/sec ?
> > >
> > > You should get much more.. how are you measuring the
> performance?
> > > What benchmark are you using?
> > >
> > > Are both the eth0 and eth1 connected to the same network/vlan?
> > >
> > > When you run the network benchmark try running "xm top"
> > > to monitor the overall cpu usage.. also run "top" in dom0
> > > to see if there's a big cpu usage in dom0.
> > >
> > > -- Pasi
> > >
> > >
> >
> > References
> >
> > Visible links
> > 1. mailto:[4]pasik@xxxxxx
>
> References
>
> Visible links
> 1. mailto:maqiang1984@xxxxxxxxx
> 2. mailto:pasik@xxxxxx
> 3. mailto:pasik@xxxxxx
> 4. mailto:pasik@xxxxxx
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