em forwarding performance (was Proposed 6.2 em RELEASE
patch
Mike Tancsa
mike at sentex.net
Thu Nov 30 10:11:19 PST 2006
At 12:57 PM 11/30/2006, Ivan Voras wrote:
>Mike Tancsa wrote:
>
> > Yeah I inadvertently slighted the NetBSD folks by leaving them out. So
> > I guess I better give them a try as well.
> >
> > The part that really surprises me is the drop in performance as firewall
> > rules are added to RELENG_6 and above. Both LINUX and RELENG_4 seem to
> > scale well with the number of rules added but RELENG_6 takes a big drop.
>
>Wasn't there some important setting in ipfw you can tweak if you need
>lots of ipfw rules? Size of some hash table?
>
>Quick Googling found this: http://info.iet.unipi.it/~luigi/ip_dummynet/
>and net.inet.ip.fw.dyn_buckets: 256. AFAIK the hash size needed to be
>tweaked manually in the code, and net.inet.ip.fw.dyn_buckets: 256 is
>listed as read-only so this might be it. Maybe mailing Luigi will help
>finding out...
I was told offlist "there is additional per-packet locking overhead
not seen in RELENG_4 where all processing is covered by the same spl."...
---Mike
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