Fred Wright said:
> I presume the HZ increase was only in that version, since the current
> version seems to have 250. Cranking it up to 1000 is actually a pretty
> bad idea - see below.
Yes, it was only for polling. From sys/i386/conf/LINT:
# It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING
# to achieve smoother behaviour.
> Only if wireless cards can generate sufficiently high packet rates to
> cause trouble, which may well not be the case.
Maybe not exactly "high packet rates", but apparently they can still
generate enough CPU load, especially with WEP and/or IPsec...
> (well, OK, 500us average) is pretty significant. What's really wanted is
> a setup where packet processing is only delayed when the system is
> "getting in trouble". And of course at some point you have to start
> throwing away packets when you can't keep up.
Yep, but let's leave that to the FreeBSD developers, shall we? ;)