Re: kernel: dst cache overflow
From: Kimmo Koivisto (kimmo.koivisto_at_surfeu.fi)
To: firstname.lastname@example.org Date: Wed, 6 Jul 2005 21:19:36 +0300
On Wednesday 06 July 2005 16:21, André Cruz wrote:
> 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
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
I had lots of udp fragments because of the IPsec VPN's, and for me those udp
fragments were the reason (I think).
> Thanks for the help.
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