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

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

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,
sephe

--
Live Free or Die