Low network performance after upgrade from FreeBSD 4.8 to 6.0

[OxY]

----- 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

>
>
> Thanks,
> Bohus Plucinsky
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