panic: kmem_malloc

Lukas Ertl l.ertl at
Fri Jul 11 13:58:13 PDT 2003

On Thu, 10 Jul 2003, Bosko Milekic wrote:

> But for now the only advice I have is that you tune the boot-time
> kern.vm.kmem.size tunable.  Don't set it too high, but you can try about
> 250,000 for your configuration.  The constant we have that caps the size
> is getting too small and we're at least going to have to bump that up
> soon.

We managed to fix this problem. A colleague found out that the incredible
amount of spoofed DNS requests that we send causes the cached hostroutes
to eat up all KVM. We now expire that routes earlier, and both machines
are running rock-solid; each of them handles 60k+ spoofed DNS requests/sec
without a glitch - probably they could take more, but we can't measure
that anymore :-)

"FreeBSD: The Power to Serve!"


Lukas Ertl                             eMail: l.ertl at
UNIX-Systemadministrator               Tel.:  (+43 1) 4277-14073
Zentraler Informatikdienst (ZID)       Fax.:  (+43 1) 4277-9140
der Universität Wien         

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