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[E1000-devel] e1000 driver is sending jumbo frames exceeding mtu
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From: Vik H. <vik...@ed...> - 2006-10-27 11:25:40
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Hi,
I'm having a big problem with e1000. It sends out packets that are =
larger than the MTU. This causes tc (linux traffic control) to get =
confused: the data is going out the interface roughly three times faster =
than the configured rate. This problem does not exist with another nic =
installed in the same system.
It's a Fedora Core 5 system upgraded to the latest packages. These are =
the relevant bits of information of my systems:
# uname -a
Linux alexandria.edch 2.6.18-1.2200.fc5 #1 SMP Sat Oct 14 16:59:56 EDT =
2006 x86_64 x86_64 x86_64 GNU/Linux
# cat /var/log/messages | grep 'e1000:'
Oct 27 12:19:45 alexandria kernel: e1000: 0000:06:01.0: e1000_probe: =
(PCI:66MHz:32-bit) xx:xx:xx:xx:xx:42
Oct 27 12:19:45 alexandria kernel: e1000: eth0: e1000_probe: Intel(R) =
PRO/1000 Network Connection
Oct 27 12:19:45 alexandria kernel: e1000: 0000:06:02.0: e1000_probe: =
(PCI:66MHz:32-bit) xx:xx:xx:xx:xx:43
Oct 27 12:19:45 alexandria kernel: e1000: eth1: e1000_probe: Intel(R) =
PRO/1000 Network Connection
Oct 27 12:19:46 alexandria kernel: e1000: eth0: e1000_watchdog: NIC Link =
is Up 100 Mbps Full Duplex
Oct 27 12:19:46 alexandria kernel: e1000: eth1: e1000_watchdog: NIC Link =
is Up 100 Mbps Full Duplex
# ip link show
1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen =
100
link/ether xx:xx:xx:xx:xx:42 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen =
100
link/ether xx:xx:xx:xx:xx:43 brd ff:ff:ff:ff:ff:ff
This is a small portion of a packet trace (tcpdump) during an FTP =
download from server 10.33.1.21 to client 10.33.1.254: notice the large =
packets going out.
13:18:12.915056 IP (tos 0x8, ttl 64, id 42189, offset 0, flags [DF], =
proto: TCP (6), length: 1500) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42872385:42873833(1448) ack 1 win 46 <nop,nop,timestamp 596232 =
304808104>
13:18:12.915178 IP (tos 0x8, ttl 64, id 42190, offset 0, flags [DF], =
proto: TCP (6), length: 1500) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42873833:42875281(1448) ack 1 win 46 <nop,nop,timestamp 596232 =
304808104>
13:18:12.915308 IP (tos 0x8, ttl 64, id 42191, offset 0, flags [DF], =
proto: TCP (6), length: 1500) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42875281:42876729(1448) ack 1 win 46 <nop,nop,timestamp 596232 =
304808104>
13:18:12.916044 IP (tos 0x8, ttl 64, id 42192, offset 0, flags [DF], =
proto: TCP (6), length: 10188) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42876729:42886865(10136) ack 1 win 46 <nop,nop,timestamp 596232 =
304808104>
13:18:12.916917 IP (tos 0x8, ttl 64, id 42199, offset 0, flags [DF], =
proto: TCP (6), length: 7292) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42886865:42894105(7240) ack 1 win 46 <nop,nop,timestamp 596232 =
304808104>
13:18:12.917293 IP (tos 0x8, ttl 64, id 42204, offset 0, flags [DF], =
proto: TCP (6), length: 7292) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42894105:42901345(7240) ack 1 win 46 <nop,nop,timestamp 596232 =
304808104>
13:18:12.918168 IP (tos 0x8, ttl 64, id 42209, offset 0, flags [DF], =
proto: TCP (6), length: 10188) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42901345:42911481(10136) ack 1 win 46 <nop,nop,timestamp 596233 =
304808105>
13:18:12.918918 IP (tos 0x8, ttl 64, id 42216, offset 0, flags [DF], =
proto: TCP (6), length: 8740) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42911481:42920169(8688) ack 1 win 46 <nop,nop,timestamp 596233 =
304808105>
13:18:12.919667 IP (tos 0x8, ttl 64, id 42222, offset 0, flags [DF], =
proto: TCP (6), length: 8740) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42920169:42928857(8688) ack 1 win 46 <nop,nop,timestamp 596233 =
304808105>
13:18:12.920166 IP (tos 0x8, ttl 64, id 42228, offset 0, flags [DF], =
proto: TCP (6), length: 7292) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42928857:42936097(7240) ack 1 win 46 <nop,nop,timestamp 596233 =
304808105>
13:18:12.920791 IP (tos 0x8, ttl 64, id 42233, offset 0, flags [DF], =
proto: TCP (6), length: 8740) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42936097:42944785(8688) ack 1 win 46 <nop,nop,timestamp 596233 =
304808105>
13:18:12.921540 IP (tos 0x8, ttl 64, id 42239, offset 0, flags [DF], =
proto: TCP (6), length: 8740) 10.33.1.21.14224 > 10.33.1.254.44645: . =
42944785:42953473(8688) ack 1 win 46 <nop,nop,timestamp 596233 =
304808105>
If there a way to configure the driver not to do this? I want my packets =
limited to 1500 standard sized ethernet frames.
Thanks,
--=20
Vik Heyndrickx
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