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xen-users
[Xen-users] Re: Memory squeeze in netback driver
7 day 20 hours and no error messages, no crashes, just solid as a rock. Thanks again for all the guidance.
Scott Moe
On 1/12/07, Scott Moe <
smoe868@xxxxxxxxx> wrote:Before I had had no dom0_mem argument. With Xen 2 I had to specifiy the Dom0 memory size and I liked the idea of dynamically resizing with Xen 3. Right now I've got both dom0_mem in grub/menu.list and dom0-min-mem in
xend-config.sxp set to the same value. So far so good. I am at just over 20 hours of uptime with no memory squeeze error messages.
I would feel better about this fix if I understood the problem. After what I have read about it in the last few days, now I am thinking it comes from the dynamic resizing of dom0 memory and not a memory leak in Xen networking. If this is the case my config with dom0_mem == dom0-min-mem should eliminate the problem completely.
I'll reply again in a week and let you know what happens.
Thanks for the help,
Scott Moe
On 1/11/07, Scott Moe <
smoe868@xxxxxxxxx> wrote:
I have had servers run Xen 2 without rebooting Dom0 for most of a year.
I am working now on a very similar machine with Xen 3.03 and Debian etch.
My
network setup is slightly customized. I have 3 IP's and use
network-route in xend-config.sxp. I specify vif-route as the vif script
in the DomU config for 2 of my VM's.
I also create a bridge in
/etc/network/interfaces. I have two other VM's that only interface to
this bridge and the VM's with their own IP's have a second vif on the
bridge. I specify the vif-bridge script in vif config for these
interfaces.
Everything boots and runs great, for several hours.
Yesterday, for example, the machine was rebooted in the morning. It ran
for 11 hours without errors, then the kern.log started to fill up with
this message:
xen-net: memory squeeze in netback driver
This
went on for 13 hours at a rate of something like 5 to 10 messages per
second. Then the log shows each vif on the bridge entering disabled
state. The vif's with dedicated IP's were not mentioned in the log, but
this morning only the dom0 ip was responsive. When I ssh into dom0 and
try to ping the IP's routed to VM's I see no route to host. I looked at route and everything was listed correctly.
I
hope someone has seen a similar problem and can give me some insite. My
experience is limited but to me this smells like a memory leak. Perhaps
there are updates that will fix this problem but have not made it into
the Debian etch packages.
Thanks,
Scott Moe
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