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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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigD90B50DFA0FCDCBFB765950B Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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 --------------enigD90B50DFA0FCDCBFB765950B Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAlCINf0ACgkQLDqVQ9VXb8jaIwCfS4YOetKal6gWd1ux55Yt+MZo zj0AoKQOM7BJvmUV5E25jYz1Z+6eVeav =508h -----END PGP SIGNATURE----- --------------enigD90B50DFA0FCDCBFB765950B--
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