We are experiencing a very similar situation. We have a server running Debian 6.0 (Squeeze) as a Xen host with several guests. From time to time the network interface on the host locks up in a cycle of timeouts and trying to reset itself. This has happened five times in the past five weeks, three of those in the past week.
We have a second Xen host server with nearly the same configuration that has not experienced this network issue. It does have a newer firmware version for the tg3 (5721-v3.61) than the server experiencing the problem (5721-v3.55a). It is possible that the Xen guests on the second server do not have the network traffic loads that trigger the problem on the first server. David, can you compare the firmware versions of your servers? Is it possible this issue has been fixed in the firmware? Below are some facts about our server that is experiencing the problem. Here is a snippet from the syslog: May 22 11:07:07 carndum kernel: [174743.812042] tg3: eth0: transmit timed out, resetting May 22 11:07:07 carndum kernel: [174743.812084] tg3: DEBUG: MAC_TX_STATUS[00000008] MAC_RX_STATUS[00000000] May 22 11:07:07 carndum kernel: [174743.812122] tg3: DEBUG: RDMAC_STATUS[00000000] WDMAC_STATUS[00000000] May 22 11:07:07 carndum kernel: [174743.913855] tg3: tg3_stop_block timed out, ofs=4800 enable_bit=2 May 22 11:07:07 carndum kernel: [174743.936658] tg3: eth0: Link is down. May 22 11:07:07 carndum kernel: [174743.984229] br0: port 1(eth0) entering disabled state May 22 11:07:10 carndum kernel: [174747.106573] tg3: eth0: Link is up at 1000 Mbps, full duplex. May 22 11:07:10 carndum kernel: [174747.106612] tg3: eth0: Flow control is off for TX and off for RX. May 22 11:07:10 carndum kernel: [174747.106849] br0: port 1(eth0) entering forwarding state lspci snippet: 0e:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 11) 0f:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 11) lshw snippet: *-network description: Ethernet interface product: NetXtreme BCM5721 Gigabit Ethernet PCI Express vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:0e:00.0 logical name: eth0 version: 11 serial: 00:19:bb:eb:e4:1c size: 1GB/s capacity: 1GB/s width: 64 bits clock: 33MHz capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.102 duplex=full firmware=5721-v3.55a, ASFIPMI v6.17 latency=0 multicast=yes port=twisted pair speed=1GB/s resources: irq:16 memory:dc200000-dc20ffff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/615053 Title: tg3 network disconnects during high usage -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs