Hi,
If you're running -CURRENT, please test this:
http://people.freebsd.org/~bmilekic/code/mbuma2.diff
It is several extensions to UMA and mbuf cluster allocation
built on top of it.
Once you apply the patch from src/, you need to rebuild and
reinstall src/usr.bin/netstat, src/usr.bin/systat, and then
a new kernel. When you're configuring your new kernel,
you should remove the NMBCLUSTERS compile-time option, it's
no longer needed. Clusters will still be capped off
according to maxusers (which is auto-tuned itself).
Alternately, if you want theoretically unlimited number
of clusters, you can tune the boot-time kern.ipc.nmbclusters
tunable to zero.
Unless final issues arise I'm going to commit this tomorrow
morning; it's been tested already quite a bit, and performance
considered. A paper is available and was presented at
BSDCan 2004; in case you missed it:
http://www.unixdaemons.com/~bmilekic/netbuf_bmilekic.pdf
It has been looked at for quite some time now. Additional
code cleanups will need to occur following commit, maybe.
Future work is also possible, see the paper if you're
interested in taking some of it on.
Oh, and keep me in the CC; I have no idea if I'm
subscribed to these lists anymore. You should also follow
up to this thread on -net and not on -hackers (trim
-hackers from CC in the future). Thanks and happy
hacking!
Regards,
--
Bosko Milekic
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