Re: Low network performance after upgrade from FreeBSD 4.8 to 6.0


----- Original Message ----- From: "Bohuslav Plucinsky" <bohuslav.plucinsky@xxxxxxxxxxxx>
To: <freebsd-questions@xxxxxxxxxxx>
Cc: <freebsd-net@xxxxxxxxxxx>
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



Thanks,
Bohus Plucinsky
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