Date: Thu, 10 Feb 2011 13:37:18 -0800 From: Jack Vogel <jfvogel@gmail.com> To: Sergey Kandaurov <pluknet@gmail.com> Cc: freebsd-net@freebsd.org, Jay Borkenhagen <jayb@braeburn.org> Subject: Re: cannot set mtu > 1500 on em0 optical Gig-E Message-ID: <AANLkTik7TNFr2dqOgcaQrHP8uaDmYijkxYF9HqUgSJi2@mail.gmail.com> In-Reply-To: <AANLkTi=VfFbwWhEA-398fSzCQOFqbFg4enNqAt7zPeOP@mail.gmail.com> References: <19796.13124.805432.342309@oz.mt.att.com> <AANLkTi=VfFbwWhEA-398fSzCQOFqbFg4enNqAt7zPeOP@mail.gmail.com>
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Thanks Sergey :) Jack On Thu, Feb 10, 2011 at 12:28 PM, Sergey Kandaurov <pluknet@gmail.com>wrote= : > On 10 February 2011 21:49, Jay Borkenhagen <jayb@braeburn.org> wrote: > > Hi, > > > > For quite a while now it appears that mtu on my gigabit ethernet fiber > > em0 cards cannot be configured higher than the default 1500 bytes. > > > > Here's what I get when I attempt to set it lower and higher on a brand > > new 8.2-RC3 box: > > > > =3D=3D=3D > > sandbox# uname -v > > FreeBSD 8.2-RC3 #0: Sun Jan 30 06:52:51 UTC 2011 > root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC > > sandbox# > > > > sandbox# ifconfig em0 > > em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu = 1500 > > options=3D18<VLAN_MTU,VLAN_HWTAGGING> > > ether 00:d0:b7:7c:f8:01 > > inet 10.1.2.3 netmask 0xffffff00 broadcast 10.1.2.255 > > media: Ethernet autoselect > > status: no carrier > > sandbox# ifconfig em0 mtu 1499 > > sandbox# ifconfig em0 | grep mtu > > em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu = 1499 > > sandbox# ifconfig em0 mtu 1501 > > ifconfig: ioctl (set mtu): Invalid argument > > sandbox# ifconfig em0 | grep mtu > > em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu = 1499 > > sandbox# ifconfig em0 mtu 1500 > > sandbox# ifconfig em0 | grep mtu > > em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu = 1500 > > sandbox# > > > > sandbox# pciconf -lv | sed -n '/em0@/,/em1/p' > > em0@pci0:0:2:0: class=3D0x020000 card=3D0x10008086 chip=3D0x10008086 r= ev=3D0x03 > hdr=3D0x00 > > vendor =3D 'Intel Corporation' > > device =3D '82542 Gigabit Ethernet Controller' > > class =3D network > > subclass =3D ethernet > > em1@pci0:0:4:0: class=3D0x020000 card=3D0x10008086 chip=3D0x10008086 r= ev=3D0x03 > hdr=3D0x00 > > sandbox# > > > > =3D=3D=3D > > > > However, back in the 6.2 days it allowed it: > > > > =3D=3D=3D > > > > [jayb@cactus ~]$ uname -v > > FreeBSD 6.2-PRERELEASE #0: Tue Dec 26 16:53:18 EST 2006 > root@cactus.iplabs.att.com:/usr/obj/usr/src/sys/CACTUS > > [jayb@cactus ~]$ > > > > [jayb@cactus ~]$ ifconfig em0 > > em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 > > options=3D8<VLAN_MTU> > > inet 10.0.1.152 netmask 0xfffffffc broadcast 10.0.1.155 > > ether 00:90:27:e3:0a:67 > > media: Ethernet autoselect > > status: no carrier > > [jayb@cactus ~]$ > > > > [jayb@cactus ~]$ sudo ifconfig em0 mtu 9000 > > [jayb@cactus ~]$ ifconfig em0 | grep mtu > > em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 9000 > > [jayb@cactus ~]$ > > > > [jayb@cactus ~]$ pciconf -lv | sed -n '/em0@/,/none0@/p' > > em0@pci0:2:0: class=3D0x020000 card=3D0x10008086 chip=3D0x10008086 r= ev=3D0x02 > hdr=3D0x00 > > vendor =3D 'Intel Corporation' > > device =3D '82542 Gigabit Ethernet Controller' > > class =3D network > > subclass =3D ethernet > > none0@pci0:4:0: class=3D0x088000 card=3D0x0767101e chip=3D0x9063101e re= v=3D0x04 > hdr=3D0x00 > > [jayb@cactus ~]$ > > > > Hmm.. Did jumbo frames really work on these cards for you? Intel claims: > "Adapters based on the Intel=AE 82542 and 82573V/E controller do not > support Jumbo Frames. These correspond to the following product names: > > * Intel=AE PRO/1000 Gigabit Server Adapter > * Intel=AE PRO/1000 PM Network Connection " > > As seen from code, the behavior was changed to match the description ("ke= ep > old 82542 from using jumbo frames") and merged to 6-STABLE before 6.3. > > -- > wbr, > pluknet > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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