> I'd rather like to have this information to be gathered at runtime within
> the kernel, where one could read out the current hash occupation via /proc
> or some ioctl.
OK, that's what I wanted to hear :-)
Actually, the interesting statistics for a hash are not that large, and all
aggregate:
- bucket occupation: number of used buckets, vs. number of all buckets
- average chain length over all buckets
- average chain length over the used buckets
- counting of a classification of the chain lengths:
- number of 0-entry buckets
- number of 1-entry buckets
- number of 2-entry buckets
- number of 4-entry buckets
- number of 8-entry buckets
- number of 16-entry buckets
- number of more-than-16-entry buckets
That's 10 values, and will at most double when I think more about it.
I propose to gather these stats on the fly, and simply printk() them
at a chosen interval:
echo 300 >/proc/net/ip_conntrack_showstat
would generate one printk() every 300 seconds. Echoing 0 would disable
the statistics gathering altogether.
I think I can hack this up, today. Having the flu must be good for something...
later
Patrick
