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Date: Thu, 25 Nov 2004 22:22:47 +0100 (CET)
From: Claus Guttesen <cguttesen@yahoo.dk>
To: "David G. Lawrence" <dg@dglawrence.com>,
	Andre Oppermann <andre@freebsd.org>
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cc: Robert Watson <rwatson@freebsd.org>
cc: freebsd-current@freebsd.org
cc: Jeremie Le Hen <jeremie@le-hen.org>
cc: freebsd-stable@freebsd.org
Subject: Re: serious networking (em) performance (ggate and NFS) problem
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> > >ifnet and netisr queues.  You could also try
> setting net.isr.enable=1 to
> > >enable direct dispatch, which in the in-bound
> direction would reduce the
> > >number of context switches and queueing.  It
> sounds like the device driver
> > >has a limit of 256 receive and transmit
> descriptors, which one supposes is
> > >probably derived from the hardware limit, but I
> have no documentation on
> > >hand so can't confirm that.

It may not cast much light on the issue but I tried
setting net.isr.enable on to 1 on a nfs-server using
tcp on 5.3 RC3 copying between three clients. When
setting net.isr.enable to 0 the cpu-usage went up. The
server is running with this setting now and is being
mounted by 11 webservers. Using em-gb-card.

Claus