DragonFly kernel List (threaded) for 2007-01
DragonFly BSD
DragonFly kernel List (threaded) for 2007-01
[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]

Re: ifconfig on re0 panics Toshiba Satellite M115-S3094 with RealTek 8101E chipset

From: "Sepherosa Ziehau" <sepherosa@xxxxxxxxx>
Date: Fri, 12 Jan 2007 17:51:18 +0800

On 1/12/07, Joe Talbott <josepht@cstone.net> wrote:
On Tue, Jan 09, 2007 at 10:39:18PM +0000, Thomas E. Spanjaard wrote:
> Joe Talbott wrote:
> >I'm experiencing some slight packet loss on the re0 interface.
> >
> >500 packets transmitted, 492 packets received, 1% packet loss
> >round-trip min/avg/max/stddev = 13.094/17.556/989.262/54.944 ms
> >
> >I ran a second ping test from another DragonFlyBSD machine on the same
> >switch.  Both pings were to the same google server.  I'm sure this
> >will be hard to diagnose.  Please let me know if there is anything I
> >can do to glean more information.
> Pinging outside your LAN introduces so many other variables that the
> results can't be used to point to re(4); please test only on your LAN to
> eliminate most of the other variables. E.g., use ttcp or iperf to test
> performance/loss.

I couldn't get ttcp or iperf on the LAN only to exhibit this problem.

From a discussion on one of the FreeBSD mailing lists this seems to be
an issue with re(4) TX checksum hardware offloading.

Interesting, I didn't have this problem on my 8169S(PCI) and it seems to only plague PCIe devices. Can you help me to do a test?

on non-re(4) side:
tcpdump -nv -i <ifcace>

on your re(4) side:
ping -n -c 1 -s 1512 <other-side>
ping -n -c 10 -s 33 <other-side>

Give me the output of the tcpdump. Thanks

Best Regards,

Live Free or Die

[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]