Subject: Re: IFQ_MAXLEN: How large can it be?
To: Greg Troxel <email@example.com>
From: Manuel Bouyer <firstname.lastname@example.org>
Date: 11/15/2006 22:56:18
On Wed, Nov 15, 2006 at 02:10:12PM -0500, Greg Troxel wrote:
> So I bumped this number on our quite busy firewall up from 256
> to 1024 and later to 4096, but I still get 1'026'678 dropped
> packets during 8 days uptime.
> I think this is unwise and will just result in more memory stress. If
> 4096 doesn't help, you're not keeping up often, or there's something
> else going on. I'd be nervous putting this above 256 - people usually
> don't and then you'll be stressing the mbuf system more than others
> have stressed it and fixed it.
Well, actually you have to bump it if you have more than one busy interface
with large ring. The wm interface can have a ring of 256 packet, so
you could get in worse case 256 packets in one interrrupt; and if you have
more than one interface you loose.
BTW, Christoph, where do you see these drops ? On the IP input queue, or
interfaces output queues ?
Manuel Bouyer <email@example.com>
NetBSD: 26 ans d'experience feront toujours la difference