Just tried to enable larger mtu on interface, and failed, even i try to
disable both of mentioned in dmesg offloads.
05:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit
Ethernet Controller (Copper) (rev 01)
05:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit
Ethernet Controller (Copper) (rev 01)
L2TP ~ # ethtool -i eth0
driver: e1000e
version: 1.9.5-k
firmware-version: 1.0-0
bus-info: 0000:05:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
Here is what i did:
ifconfig eth1 mtu 2000
got dmesg:
[ 9160.679354] e1000e 0000:05:00.0: eth0: Jumbo frames cannot be
enabled when both receive checksum offload and receive hashing are
enabled. Disable one of the receive offload features before enabling
jumbos.
ethtool -K eth1 rxhash off
dmesg:
[ 9194.208856] e1000e 0000:05:00.1: eth1: Reset adapter
[ 9197.295425] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow
Control: None
Lost connectivity for few seconds, then again i tried to:
ifconfig eth1 mtu 2000
dmesg:
[ 9207.797616] e1000e 0000:05:00.0: eth0: Jumbo frames cannot be
enabled when both receive checksum offload and receive hashing are
enabled. Disable one of the receive offload features before enabling
jumbos.
ethtool -K eth1 rx off
[ 9222.398034] e1000e 0000:05:00.1: eth1: Reset adapter
[ 9225.497550] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow
Control: None
Again, tried: ifconfig eth1 mtu 2000
dmesg:
[ 9254.795445] e1000e 0000:05:00.0: eth0: Jumbo frames cannot be
enabled when both receive checksum offload and receive hashing are
enabled. Disable one of the receive offload features before enabling
jumbos.
L2TP ~ # ethtool -k eth1
Offload parameters for eth1:
rx-checksumming: off
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: off
L2TP ~ # ethtool -d eth1
MAC Registers
-------------
0x00000: CTRL (Device control register) 0x40144241
Endian mode (buffers): little
Link reset: normal
Set link up: 1
Invert Loss-Of-Signal: no
Receive flow control: disabled
Transmit flow control: disabled
VLAN mode: enabled
Auto speed detect: disabled
Speed select: 1000Mb/s
Force speed: no
Force duplex: no
0x00008: STATUS (Device status register) 0x02080787
Duplex: full
Link up: link config
TBI mode: disabled
Link speed: 1000Mb/s
Bus type: PCI Express
Port number: 1
0x00100: RCTL (Receive control register) 0x04008002
Receiver: enabled
Store bad packets: disabled
Unicast promiscuous: disabled
Multicast promiscuous: disabled
Long packet: disabled
Descriptor minimum threshold size: 1/2
Broadcast accept mode: accept
VLAN filter: disabled
Canonical form indicator: disabled
Discard pause frames: filtered
Pass MAC control frames: don't pass
Receive buffer size: 2048
0x02808: RDLEN (Receive desc length) 0x00001000
0x02810: RDH (Receive desc head) 0x00000046
0x02818: RDT (Receive desc tail) 0x00000040
0x02820: RDTR (Receive delay timer) 0x00000020
0x00400: TCTL (Transmit ctrl register) 0x3103F0FA
Transmitter: enabled
Pad short packets: enabled
Software XOFF Transmission: disabled
Re-transmit on late collision: enabled
0x03808: TDLEN (Transmit desc length) 0x00001000
0x03810: TDH (Transmit desc head) 0x00000098
0x03818: TDT (Transmit desc tail) 0x00000099
0x03820: TIDV (Transmit delay timer) 0x00000008
PHY type: unknown
---
Denys Fedoryshchenko, Network Engineer, Virtual ISP S.A.L.
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