Re: [Xen-users] Memory squeeze in netback driver?

["Ryan Burke" <burke@xxxxxxxxxxxxxxxxx>]

> Is there any rule for how much memory dom0_mem should be set to?
> I've got 16g in this machine, and run ~12 1g domU's.
>
> Is more memory for dom0_mem better?  or is less better?
>
> --jason
>
>
> On May 3, 2007, at 8:14 AM, Adam Jacob wrote:
>
>> On Thu, May 03, 2007 at 03:03:43AM -0700, Jason Dillon wrote:
>>> I've been running into this from time to time... usually when xm
>>> creating a new domU, /var/log/messages for dom0 spits out:
>>>
>>> <snip>
>>> May  3 02:56:04 tweak kernel: printk: 4 messages suppressed.
>>> May  3 02:56:04 tweak kernel: xen_net: Memory squeeze in netback
>>> driver.
>>> </snip>
>>>
>>> And at this point all of the network connectivity for *all* domU's
>>> controlled for that dom0 vanish.  I have to xm shutdown and xm create
>>> them again to get the network back.  This doesn't happen all of the
>>> time, seems rather random really.
>>>
>>> Its *really* annoying.  Is there a way to prevent this from
>>> happening?
>>
>> You need to set the dom0_mem parameter at boot time.  Something like:
>>
>> kernel          /xen-3.0.3-1-amd64.gz dom0_mem=256M
>>
>> Has been working for us.
>>
>> Adam
>>


Have any of you tried setting the dom0_min_mem variable? I had this
problem back in 3.0.2 and if I remember right the solution was to set
dom0_min_mem so that there wasa minimum that Dom0 would balloon down. I
think that fixed it.

Ryan

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