Subject: Re: nfe(4) hardware checksum support
To: Izumi Tsutsui <firstname.lastname@example.org>
From: Quentin Garnier <email@example.com>
Date: 02/04/2007 05:31:49
Content-Type: text/plain; charset=us-ascii
On Sun, Feb 04, 2007 at 12:46:27PM +0900, Izumi Tsutsui wrote:
> firstname.lastname@example.org wrote:
> > I applied the patch today and built a new kernel from the -current sour=
> > of today. Unfortunately, the patch doesn't seem to fix the problem.
> > When accessing two NFS servers simultaneously, packet reception stops
> > every now and then for about 30 seconds at a time.
> Hmm, I'm afraid it's difficult to debug it only by code inspection,
> but could you check which TX or RX could cause problem (by ttcp etc.)
> and interrupt/network statistics during stall (by vmstat -i or
> netstat -i etc.)?
RX is definitely the problem. When I experience such stalls (which seem
to happen as soon as a high packet rate comes in), I can still see
packets coming out through nfe. I don't remember if I checked with
tcpdump, but pinging the broadcast address does blink the whole switch,
so I'm quite positive.
Quentin Garnier - email@example.com - cube@NetBSD.org
"You could have made it, spitting out benchmarks
Owe it to yourself not to fail"
Amplifico, Spitting Out Benchmarks, Hometakes Vol. 2, 2005.
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