Date: Wed, 4 May 2016 19:33:50 +0000 From: Wayne H <testdog@hotmail.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Not able to raise the MTU on FreeBSD 10.3 Message-ID: <BLU172-W2076011C8CC090218DCD6EB57B0@phx.gbl>
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I have two new servers connected together with 10 gig Intel and 1 gig Nic=
cards. It doesn't matter if I have them connected via a switch or directly=
connected to each other. I am unable to pass ping packets above 1472. If I=
set the MTU to anything up to 9000 I till can't pass anything above 1472. =
I have the 10 gig connected via an Intel SFP+ Cable between the servers. I =
also tried connecting the 1 gig Nics between the servers.
I would like to use jumbo frames to mount these servers to a NFS server. If=
I set the MTU to 9000 in rc.conf on boot up I can mount the NFS but as soo=
n as I try to write to it the NFS hangs. If I umount and reset the MTU to 1=
500 it works fine.
Anyone know what I am doing wrong?
root@backgate1:/usr/home/wayne # ping -D -s 1472 10.168.48.145
PING 10.168.48.145 (10.168.48.145): 1472 data bytes
1480 bytes from 10.168.48.145: icmp_seq=3D0 ttl=3D64 time=3D0.111 ms
1480 bytes from 10.168.48.145: icmp_seq=3D1 ttl=3D64 time=3D0.059 ms
^C
--- 10.168.48.145 ping statistics ---
2 packets transmitted=2C 2 packets received=2C 0.0% packet loss
round-trip min/avg/max/stddev =3D 0.059/0.085/0.111/0.026 ms
root@backgate1:/usr/home/wayne # ping -D -s 1473 10.168.48.145
PING 10.168.48.145 (10.168.48.145): 1473 data bytes
ping: sendto: Message too long
ping: sendto: Message too long
^C
--- 10.168.48.145 ping statistics ---
2 packets transmitted=2C 0 packets received=2C 100.0% packet loss
FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25 02:10:02 UTC 2016 root@rele=
ng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
Intel(R) Ethernet Connection XL710 Driver=2C Version - 1.4.3
ixl0@pci0:5:0:0: class=3D0x020000 card=3D0x00078086 chip=3D0x1572808=
6 rev=3D0x01 hdr=3D0x00
vendor =3D 'Intel Corporation'
device =3D 'Ethernet Controller X710 for 10GbE SFP+'
class =3D network
ntel(R) PRO/1000 Network Connection=2C Version - 2.5.3-k
=20
igb0@pci0:11:0:0: class=3D0x020000 card=3D0x152115d9 chip=3D0x1521808=
6 rev=3D0x01 hdr=3D0x00
vendor =3D 'Intel Corporation'
device =3D 'I350 Gigabit Network Connection'
class =3D network
ixl0: flags=3D8843<UP=2CBROADCAST=2CRUNNING=2CSIMPLEX=2CMULTICAST> metric 0=
mtu 9000
options=3D6407bb<RXCSUM=2CTXCSUM=2CVLAN_MTU=2CVLAN_HWTAGGING=2CJUMB=
O_MTU=2CVLAN_HWCSUM=2CTSO4=2CTSO6=2CLRO=2CVLAN_HWTSO=2CRXCSUM_IPV6=2CTXCSUM=
_IPV6>
ether 3c:fd:fe:9d:5c:24
inet 10.168.48.144 netmask 0xffffff00 broadcast 10.168.48.255
nd6 options=3D29<PERFORMNUD=2CIFDISABLED=2CAUTO_LINKLOCAL>
media: Ethernet autoselect (10Gbase-Twinax <full-duplex>)
status: active
igb0: flags=3D8843<UP=2CBROADCAST=2CRUNNING=2CSIMPLEX=2CMULTICAST> metric 0=
mtu 9000
options=3D403bb<RXCSUM=2CTXCSUM=2CVLAN_MTU=2CVLAN_HWTAGGING=2CJUMBO=
_MTU=2CVLAN_HWCSUM=2CTSO4=2CTSO6=2CVLAN_HWTSO>
ether 0c:c4:7a:32:f0:51
inet 172.16.48.244 netmask 0xffffff00 broadcast 172.16.48.255
nd6 options=3D29<PERFORMNUD=2CIFDISABLED=2CAUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
Thanks
=
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