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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] The bottleneck of using multinetwork card?
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 _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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