Subject: Re: Running out of buffer space
To: Peter Seebach <>
From: Manuel Bouyer <>
List: current-users
Date: 02/03/2004 22:08:53
On Mon, Feb 02, 2004 at 01:02:46PM -0600, Peter Seebach wrote:
> I have a slightly dodgy network connection via cell phone.  On this network,
> it appears to be common for me to run out of buffer space.  If I'm very
> patient, it sometimes recovers.
> It seems to be that on a machine with 640MB of memory, I shouldn't be running
> out of network buffers in 5 minutes or less.
> Is there a tuning knob I should be looking at?

It's a ppp connection, right ?
Maybe the ifq for the ppp interface is too low.
You can try to bump the IFQ_MAXLEN options. There's also the
net.inet.ip.ifq.maxlen sysctl, but it's probably not writable (and the
interface drivers use IFQ_MAXLEN anyway).

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference