Re: OOM when adding ipv6 route: How to make available more per-cpumemory?

[Ben Greear]

On 11/06/2010 12:26 AM, Eric Dumazet wrote:
> Le vendredi 05 novembre 2010 Ã 17:07 -0700, Ben Greear a Ãcrit :
>
> > We just tried creating 1000 macvlans with IPv6 addrs on a 64-bit machine
> > with 12GB RAM.  Only around 520 interfaces properly set their IPs, and
> > again there are errors about of-of-memory from 'ip', but no obvious
> > splats in dmesg.
> >
> > 'top' shows 10G or so free.
> >
> > It will take some time to figure out what exactly is returning
> > the ENOMEM....
>
> At least, nothing to do with percpu stuff ?

At least I don't see any percpu dumps in dmesg.  I vaguely remember
someone posting some ipv6 address scalability patches some time back.
I think they had to hack on /proc fs as well.  I'll see if I can
dig those up.

> Make sure udev / hotplug is not the problem, if you create your devices
> very fast.

We can create the macvlans w/out problem, though I'm sure that could
be sped up.  The problem is when we try to add IPv6 addresses to
them.

Thanks,
Ben


--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com
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