Re: kernel: dst cache overflow

From: Kimmo Koivisto (kimmo.koivisto_at_surfeu.fi)
Date: 07/06/05

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    To: fedora-list@redhat.com
Date: Wed, 6 Jul 2005 21:19:36 +0300

    On Wednesday 06 July 2005 16:21, André Cruz wrote:
    > Hello.
    > I have a router running FC 2 with kernel 2.6.10-1.770_FC2.
    >
    > Yesterday my network went down and a lot of "dst cache overflow"
    > appeared in my console. I then increased
    > my /proc/sys/net/ipv4/route/max_size from 8192 to 16384 and my network
    > started to work again...
    >
    > The problem is that dst_cache keeps increasing:
    > [root@saf113 root]# cat /proc/slabinfo |grep ip_dst_ca
    > ip_dst_cache 9210 9210 256 15 1 : tunables 120 60 0 : slabdata 614 614 0
    >
    > This way the problem will repeat itself... Is there a solution to this?
    > Is this a known bug?

    Yes it is a known bug, see
    http://oss.sgi.com/archives/netdev/2005-01/msg01367.html
    http://lists.linuxcoding.com/rhl/2005/msg21777.html

    The bug is fixed for vanilla 2.6.11 and AFAIK 2.6.11-1.7_FC3 was the first
    FC3-kernel that had it fixed.

    Flushing did not help for me, I had to monitor dst cache and reboot when cache
    was full.

    I had lots of udp fragments because of the IPsec VPN's, and for me those udp
    fragments were the reason (I think).

    Regards
    Kimmo Koivisto
    >
    > Thanks for the help.
    > André 

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