Subject: Re: problem with mbufs
To: Matthias Winter <firstname.lastname@example.org>
From: Jaromir Dolecek <email@example.com>
Date: 02/06/2002 21:11:16
Matthias Winter wrote:
> i have a i386 computer, working as network router / webserver. everything
> works fine since i changed nmbclusters from 256 -> 2048 (before that i
> always got disconnects when there was a lot of traffic). But if the traffic
> gets really bad i still become disconnected by my ISP.
If it's still not enough, keep raising NMBCLUSTERS - 4096 or 8192
are still fairly sane values, 2048 is quite low for busy
> The error says something like: write: sendto: no buffer sdpace available
Yeah, this is the symptom of mbuf shortage.
> After reading through the articles oon netbsd.org I came to the opinion that
> the reason for this can be found at the kern.mbuf.msize
> sysctl kern.mbuf.msize is 256 at the moment.. but how can i change this?
> sysctl -w kern.mbuf.msize=512 ---> operation not permitted (does not work on
> all architectures?)
You don't need to change the msize.
> Can anyone tell me how to change this kernel option without compiling a new
> kernel? i have some probs with my hardware which make sbuilding a new kernel
> impossible for me at the moment!
You can change the value for compiled kernel using gdb:
> gdb --write /yourkernel
(gdb) set nmbclusters 4096
reboot and that's it :)
Jaromir Dolecek <jdolecek@NetBSD.org> http://www.NetBSD.org/Ports/i386/ps2.html
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