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Date:      Wed, 24 Oct 2012 20:39:57 +0200
From:      Harald Schmalzbauer <h.schmalzbauer@omnilan.de>
To:        Jeremy Chadwick <jdc@koitsu.org>
Cc:        Adrian Chadd <adrian@freebsd.org>, FreeBSD Stable <freebsd-stable@freebsd.org>
Subject:   Re: every 2nd echo-request malformed when ping -s >4067
Message-ID:  <508835FD.4000709@omnilan.de>
In-Reply-To: <20121024181239.GA5755@icarus.home.lan>
References:  <20121024154017.GA3167@icarus.home.lan> <5088163E.2090506@omnilan.de> <20121024165148.GA4250@icarus.home.lan> <50881EC7.9030400@omnilan.de> <20121024174425.GA4699@icarus.home.lan> <50882D3B.5050704@omnilan.de> <20121024181239.GA5755@icarus.home.lan>

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 schrieb Jeremy Chadwick am 24.10.2012 20:12 (localtime):
> ...
> root@icarus:/root # ping -D -s 4068 127.0.0.1
> PING 127.0.0.1 (127.0.0.1): 4068 data bytes
> 4076 bytes from 127.0.0.1: icmp_seq=3D0 ttl=3D64 time=3D0.030 ms
> 4076 bytes from 127.0.0.1: icmp_seq=3D1 ttl=3D64 time=3D0.032 ms
> 4076 bytes from 127.0.0.1: icmp_seq=3D2 ttl=3D64 time=3D0.024 ms
> ^C
> --- 127.0.0.1 ping statistics ---
> 3 packets transmitted, 3 packets received, 0.0% packet loss
> round-trip min/avg/max/stddev =3D 0.024/0.029/0.032/0.003 ms
>
> I also ran tcpdump for this too; no anomalies -- all 3 packets showed u=
p
> correctly (decoded correctly).  My uname -a is below, with csup run
> about 20 minutes before the kernel build date.
>
> FreeBSD icarus.home.lan 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #0: Sun O=
ct 21 05:24:09 PDT 2012     root@icarus.home.lan:/usr/obj/usr/src/sys/X7S=
BA_RELENG_9_amd64  amd64
>
> This is on bare-metal hardware, BTW.  I mention that because I've seen
> some of your other threads talking about NIC driver ordeals under VMs (=
I
> think).

Oh, I thought it's not specific to my system because I remembered this
issue well on a completely different HW; real HW in that case.

A quick test showed that the big-ping to localhost works on all my other
machines... Should have checked that before, sorry.

I have zero_copy_sockets in all my kernels, so I think that can't be the
cause.
But I don't have another machine where real nics have MTU > 1500.
I'll try to find out why this only affects one machine here at the
moment, but tonight's time to have dinner->sleep.

Thanks a lot!

-Harry




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