On Mon, Sep 06, 2010 at 03:09:47PM +0800, ma qiang wrote:
> >On Mon, Sep 06, 2010 at 02:52:16PM +0800, ma qiang wrote:
> > I did the same test one the same computer in dom0 using only one
> network
> > card, the results show 1000M/sec.
> >
> >So what kind of guests are you using the benchmark from?
> That is IXIA side based on centos 5.4 also.
>
In an earlier email you said it was Xen HVM guest.
You need to install PV-on-HVM drivers to it. It won't be fast otherwise.
Or then install it as a PV guest, that'll be fast out-of-the-box.
-- Pasi
> On Mon, Sep 6, 2010 at 3:02 PM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote:
>
> 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?
> In dom0 and bare linux, the results show both 1000M. But in domU, the
> results are bad.
>
>
>
> Also if your guest is HVM, have you installed PV-on-HVM drivers?
> without those drivers the performance will be bad from the guest.
> PV-on-HVM drivers ? Sorry, I haven't installed that. And I'm going
> to search that.
>
>
>
> -- Pasi
> > On Mon, Sep 6, 2010 at 2:57 PM, ma qiang
> <[1][2]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][3]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][4]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][5]pasik@xxxxxx
> >
> > References
> >
> > Visible links
> > 1. mailto:[6]maqiang1984@xxxxxxxxx
> > 2. mailto:[7]pasik@xxxxxx
> > 3. mailto:[8]pasik@xxxxxx
> > 4. mailto:[9]pasik@xxxxxx
>
> References
>
> Visible links
> 1. mailto:pasik@xxxxxx
> 2. mailto:maqiang1984@xxxxxxxxx
> 3. mailto:pasik@xxxxxx
> 4. mailto:pasik@xxxxxx
> 5. mailto:pasik@xxxxxx
> 6. mailto:maqiang1984@xxxxxxxxx
> 7. mailto:pasik@xxxxxx
> 8. mailto:pasik@xxxxxx
> 9. mailto:pasik@xxxxxx
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