domUs become unaccessible running 2.6.20-1.2962.fc6xen on host

[Asrai khn]

Hi,

We have recently update kernel-xen on all of our hosts (3) and its vms all
running fc6. kernel-xen 2.6.20-1.2962.fc6xen is doing good on two hosts and
all its vms (10), however its giving lot of problem on third host.

when i reboots the host into latest kernel-xen the domUs become unaccessible
in a while hardly run for 10 minutes, 'xm list' still shows there status but
i can't access it from outside.

We are using loop back files for domUs File system, for testing i rebooted
host into last working kernel 2.6.20-1.2952.fc6xen and domUs into latest
kernel-xen and its doing pretty good, which mean latest kernel-xen is only
giving problem at host side.

when running 2.6.20-1.2962 on host it giving this in /var/log/messages

Jul 12 10:42:45 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:42:50 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:42:50 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:42:55 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:42:55 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:00 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:00 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:05 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:05 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:10 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:10 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:15 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:15 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:20 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:20 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:25 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:25 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:30 xxxx kernel: printk: 4 messages suppressed.
Jul 12 10:43:30 xxxx kernel: xen_net: Memory squeeze in netback driver.
Jul 12 10:43:35 xxxx kernel: printk: 4 messages suppressed.

Thanks. Askar

[Asrai khn]

On 7/12/07, Asrai khn <asraikhn(a)gmail.com&gt; wrote:
>  Hi,
>
>  We have recently update kernel-xen on all of our hosts (3) and its vms all
>  running fc6. kernel-xen 2.6.20-1.2962.fc6xen is doing good on two hosts
>  and all its vms (10), however its giving lot of problem on third host.
>
>  when i reboots the host into latest kernel-xen the domUs become
>  unaccessible in a while hardly run for 10 minutes, 'xm list' still shows
>  there status but i can't access it from outside.
>
>  We are using loop back files for domUs File system, for testing i rebooted
>  host into last working kernel 2.6.20-1.2952.fc6xen and domUs into latest
>  kernel-xen and its doing pretty good, which mean latest kernel-xen is only
>  giving problem at host side.
>
>  when running 2.6.20-1.2962 on host it giving this in /var/log/messages
>
>  Jul 12 10:42:45 xxxx kernel: xen_net: Memory squeeze in netback driver.
>  Jul 12 10:42:50 xxxx kernel: printk: 4 messages suppressed.
>  Jul 12 10:42:50 xxxx kernel: xen_net: Memory squeeze in netback driver.
>  Jul 12 10:42:55 xxxx kernel: printk: 4 messages suppressed. 
(...)

Same thing happen again when today i updated host kernel-xen from 2.6.20-
1.2952.fc6xen To 2.6.20-1.2999.fc6xen. It working fine at domUs but when I
reboot the domO into 2.6.20-1.2999.fc6xen it start giving these errors in

Aug 23 18:41:52 xxxx kernel: printk: 4 messages suppressed.
Aug 23 18:41:52 xxxx kernel: xen_net: Memory squeeze in netback driver.
Aug 23 18:41:57 xxxxl kernel: printk: 4 messages suppressed.
Aug 23 18:41:57 xxxx kernel: xen_net: Memory squeeze in netback driver.
Aug 23 18:42:02 xxxxxl kernel: printk: 4 messages suppressed.
Aug 23 18:42:02 xxx kernel: xen_net: Memory squeeze in netback driver.

and all domUs become unaccessible, in end I have to revert back to 2.6.20-
1.2952.fc6xen at domO (host) :-s

Any help in this regard will be highly appreciated.

Regards. Askar