Low network performance after upgrade from FreeBSD 4.8 to 6.0

[Kris Kennaway]

On Mon, Mar 20, 2006 at 03:33:33PM +0100, OxY wrote:
> 
> ----- Original Message ----- 
> From: "Bohuslav Plucinsky" <bohuslav.plucinsky at in.nextra.sk>
> To: <freebsd-questions at freebsd.org>
> Cc: <freebsd-net at freebsd.org>
> Sent: Monday, March 20, 2006 2:10 PM
> Subject: Low network performance after upgrade from FreeBSD 4.8 to 6.0
> 
> 
> >Hello,
> >
> >I use the FreeBSD box as the firewall with NAT (ipfw + natd).
> >When I've upgraded the box from 4.8-20030810-STABLE to 6.0-RELEASE
> >I've noticed a performance degradation.
> >
> >I've only one workstation behind the firewall and throughput
> >of downloading an ISO image through the firewall with 6.0-RELEASE
> >booted, is only 24Mbps. (When I reboot the machine with 
> >4.8-20030810-STABLE
> >installation, the throughput is 80Mbps). The firewall_type was "open"
> >during the download:
> >
> >
> > PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
> > 229 root        1 105    0  1428K   904K RUN      0:35 40.82% natd
> >
> >options HZ=100
> >Can somebody advise me, if this is some configuration problem
> >or the requirement of FreeBSD 6.0 kernel has been increased and HW
> >of my firewall is not enough?
> 
> HZ=100 is not a good idea..
> i set it to 1000 before and i had no idle CPU
> try to set it to 2000
> echo 'kern.hz="2000"' >> /boot/loader.conf

I don't think that's a sensible idea on a 400MHz CPU.

Kris
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