On Mon, 15 Apr 2013, Sean Bruno wrote:
FreeBSD has too many knobs, but it would be nice if the bge defaults weren't
so broken, so that they don't need overriding.
So many knobs ... well here's more. :-)
Yes, adding more knobs would subtract value.
http://people.freebsd.org/~sbruno/bge_config_update.txt
At least this gets a man page update with references to manuals.
I didn't notice before that these are tunables and not sysctls. That's
much more broken. Actually tuning using them like I do with sysctls
would take ~10000 reboots. Tunables are bogus for anything that isn't
needed for booting. Optimizations are needed for booting.
Technical bugs include:
- wrong defaults are claimed for *coal_ticks. The defaults are 150, but
are claimed to be 150 milliseconds. These values are dimensionless,
but since ticks take 1 microsecond each, 150 gives 150 microseconds,
not 150 milliseconds.
- *coal_bds is claimed to be a count of packes (sic). Actually, it is a
count of buffer descriptors. Small packets take 1 bd, but normal
packets take 2, and jumbo packets many (?). The best tuning may be
depend on the average bds/packet.
- the new tunables are in the wrong namespace (hw instead of dev)
- the new tunables are too global (bge instead of bge.N)
There are only 2 bge tunables now, and they only have half of these bugs:
- hw.bge.allow_asf is in the wrong namespace
- hw.bge.allow_asf is too global
- dev.bge.%d.msi seems to be correct.
Both of the old tunables are needed for boot-time configuration.
Bruce
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