On Oct 9 2009, Mark Johnson wrote:
J. Landamore wrote:
Hardware: X4150, 8 cores, 8Gb RAM; 2 off
Dom0: b122, limited to 2 cores, 2Gb RAM
DomUs: 4 Solaris 10u7, 2 with 1 core 1Gb and 2 with 2 cores 2 GB
The single core DomUs act as DHCP/LDAP servers, the two core DomUs
act as fileservers
problem: Under heavy load the network on the DomU stops working. So for
example rsync between the servers on different metal will work fine for
up to 30 minutes and then stop. Cannot ping out of or in to the DomU,
but ifconfig and dladm appear to show everything OK. Reboot the DomU and
it is all back to normal. Happens if the LDAP and DHCP server comes
under heavy load (class of 150 trying to log in to workstations
simultaneously) When lightly loaded the machines have been Ok The ports
are at 1000Mb, but I don't remember the problem occurring when they were
going at 100Mb
Can you do a kstat xnbo on dom0 when this happens?
Might be a day or two as I'm off for a couple of days, but will do
So, several questions.
Has anyone else seen this?
I know Dave had run into a network hang problem that he fixed... Not
sure if that fix has made it back to the gate. Dave?
What can I look at to track down the cause, I cannot see anything obvious
in the logs?
kstats on the interface in dom0 and domU would help.
Will do as soon as I'm back
Two of the DomUs on each machine have dedicated network ports. At
present they are bridged through Dom0, I believe that in this situation
I can go straight to the port from the DomU. Is how to do this
documented anywhere and can I make the change without having to rebuild
the DomU?
Not quite sure what your asking? Can you give a little more detail
on what you want to do?
As you know the 4150 has 4 e1000g ports. Our configuration is that Dom0
uses e1000g0, DomU[0] uses e1000g1, DomU[1] uses e1000g2 and DomU[2]&[3]
use e1000g3 At present all the DomUs have the networking defined as per the
snippet of xml below which, from my understanding, means network traffic
goes through the Dom0 via a vnic before leaving the box on the specified
port. I thought I had seen a comment in a post some months ago that in the
situation we are in for DomU[0] and DomU[1] the "scripts/vif-vnic" could be
replaced by "scripts/vif-dedicated" (or something similar) and with some
other reconfiguration network traffic could go directly from DomU[0] to
e1000g1, bypassing the vnic through Dom0, similarly for Domu[1] and
e1000g2. Have I mis-understood the situation?
Thanks
John
Thanks,
MRJ
Relevant part of xml file:
<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
<interface type='bridge'>
<mac address='52:54:00:11:48:0f'/>
<source bridge='e1000g2'/>
<script path='/usr/lib/xen/scripts/vif-vnic'/>
<target dev='vif11.0'/>
</interface>
Thanks for any help
John
John Landamore
Department of Computer Science
University of Leicester
University Road
Leicester
UK
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