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    SubjectRe: OOM when adding ipv6 route: How to make available more per-cpu memory?
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    Le samedi 06 novembre 2010 à 10:08 -0700, Ben Greear a écrit :

    > 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.

    I see. Did you check /proc/sys/net/ipv6/ tunables ?

    For example, I bet you need to make route/max_size a bigger value than
    default (4096)

    Following is working for me

    echo 16384 >/proc/sys/net/ipv6/route/max_size
    modprobe dummy numdummies=2000
    for a in `seq 1 1999`
    do
    ip -6 add add 4444::444:$a/24 dev dummy$a
    done

    ip -6 ro | wc -l
    6008



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