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

[Jason Dillon <jason@xxxxxxxxxxxx>]

I've not tried setting dom0_min_mem, this is also a kernel param?   
Any suggestions on what that size should be?
--jason


On May 3, 2007, at 4:03 PM, Ryan Burke wrote:

> > 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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