Hi
Is there anyone who has successfully resolved the low throughput problem in
Guest communication.
I am using Xen3.4.1 with PV os kernel 2.6.30-rc6-tip On fedora11. While running
netperf benchmark on guests throughput results are very low
DomU to DomU 0.29 Mbps
Why is it so? What would be the problem. Is there any issue with fc11 platform?
Regards,
Fasiha Ashraf
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On Wed, Sep 16, 2009 at 02:29:35PM +0530, Fasiha Ashraf wrote:> Hi > Is there anyone who has successfully resolved the low throughput problem in Guest communication. > I am using Xen3.4.1 with PV os kernel 2.6.30-rc6-tip On fedora11. While running netperf benchmark on guests throughput results are very low > DomU to DomU 0.29 Mbps > > Why is it so? What would be the problem. Is there any issue with fc11 platform?- Is domU <-> dom0 slow aswell? - Is domU <-> internet slow? - Do you have errors on domU ethX interfaces? - Do you have errors no dom0 interfaces (pethx, all bridges, all vifs). - Does domU or dom0 have high CPU-usage? What does "top" show in dom0, and in domU? - What does "xm top" say about CPU usage? - Do you have errors in the logs? Please check - dom0 dmesg - dom0 /var/log/messages - Xen log: "xm log" - Xen dmesg: "xm dmesg" - domU dmesg - domU /var/log/messaegs Please try all of the above. -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
- Is domU <-> dom0 slow aswell?
No its working well the throughput is around 2000 to 3000 Mbps in this case
- Is domU <-> internet slow?
No, Its working well.
- Do you have errors on domU ethX interfaces?
No such errors seen.
- Do you have errors no dom0 interfaces (pethx, all bridges, all vifs).
No, errors
- Does domU or dom0 have high CPU-usage? What does "top" show in dom0,
and in domU?
To the max 10 to 20% while running netperf
- What does "xm top" say about CPU usage?
cpu usage 10 to 20%
- Do you have errors in the logs? Please check
- dom0 dmesg
NO such messages
- dom0 /var/log/messages
No messages else this
Sep 14 14:37:09 HPCNL-SR-2 kernel:
vif1.0 (vif): not using net_device_ops yet
Sep 14 14:37:09 HPCNL-SR-2
NetworkManager: nm_device_ethernet_new: assertion `driver != NULL''
failed
Sep 14 14:37:10 HPCNL-SR-2 kernel:
device vif1.0 entered promiscuous mode
Sep 14 14:37:10 HPCNL-SR-2 kernel:
eth0: topology change detected, propagating
Sep 14 14:37:10 HPCNL-SR-2 kernel:
eth0: port 2(vif1.0) entering forwarding state
Sep 14 14:37:10 HPCNL-SR-2 logger:
/etc/xen/scripts/vif-bridge: iptables setup failed. This may affect
guest networking.
Sep 14 14:37:11 HPCNL-SR-2
avahi-daemon[1439]: Registering new address record for
fe80::fcff:ffff:feff:ffff on vif1.0.*.
Sep 14 14:37:11 HPCNL-SR-2 kernel:
blkback: ring-ref 8, event-channel 9, protocol 1 (x86_32-abi)
Sep 14 14:37:14 HPCNL-SR-2
nm-system-settings: Added default wired connection ''Auto
vif1.0'' for
/org/freedesktop/Hal/devices/net_fe_ff_ff_ff_ff_ff
- Xen log: "xm log"
- Xen dmesg: "xm dmesg"
- domU dmesg
- domU /var/log/messaegs
What does that mean. I am trying all the other logs as well. thanks for your
concern.
Regards,
Fasiha
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I have found some relevant error in the log files of guest domains
/var/log/xen/qemu-dm-F11-G2S2.log the same error is shown in all guests I have
used for netperf test.
domid: 6
Warning: vlan 0 is not connected to host network
qemu: ignoring not-understood drive `sda2''
Watching /local/domain/0/device-model/6/logdirty/next-active
Watching /local/domain/0/device-model/6/command
char device redirected to /dev/pts/4
/usr/src/xen-3.4-testing.hg/tools/ioemu-dir/hw/xen_blktap.c:628: Init blktap
pipes
xs_read(): vncpasswd get error.
/vm/fb477f56-bb98-c144-54a4-74dd4379b094/vncpasswd.
Regards,
Fasiha
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