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From: Wolfgang Zenker <wolfgang@saturn.lyxys.ka.sub.org>
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Subject: Re: high interrupt load under 6.0?
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Hi,

> I have a 486DX50 firewall that has been serving me well for a number of
> years.  I recently upgraded it fro 5.4 to 6.0 and performance plumeted
> rather drastically (about 40%).  I would like to fix it.  What I have
> noticed is that even when sitting idle the system spends ~20% of its
> time in interrupt.  Below I have included dmesg, kernel config, and
> vmstat -i information.
> [..]
> interrupt                          total       rate
> irq0: clk                      203894894       1000

a clock rate of 1000 Hz is probably to high for a 486 class cpu.
You should add "options HZ=100" to your kernel config to get back
to the 100 Hz that where default before 6.0

Wolfgang