Re: eth0: transmit timed out

[Arne Kepp <ak@openplans.org>]

Thanks David,

Yes, I am using rtl8139 and it is running 2.6.18-53.1.13.el5 (Red Hat 
kernel, CentOS).

ethtool -S eth0  on the guest says, when locked up:
NIC statistics:
  early_rx: 0
  tx_buf_mapped: 0
  tx_timeouts: 4
  rx_lost_in_ring: 0

It appears that 'noapic' did the trick, which is great, thanks! I am 
somewhat worried I'll be missing out on some SMP performance? But that's 
secondary.

Please let me know if there is anything I can do to gather any more info 
to help debug the problem.

-Arne

david ahern wrote:
> I presume you are using the default rtl8139 nic. Correct?
>
> What does 'ethtool -S eth0' show when the network locks up? Many months ago
> adding 'noapic' to the (guest) kernel boot parameters helped, but that option is
> not currently helping with my RHEL4 networking issues.
>
> A thread for this issue is at:
> http://sourceforge.net/tracker/index.php?func=detail&aid=1802082&group_id=180599&atid=893831
>
> david
>
>
> Arne Kepp wrote:
>   
>> Hi,
>>
>> I am running KVM 61 on CentOS 5.1 x86_64 (on a Dell PowerEdge 2950 
>> III).  I start my virtual machine as follows:
>> qemu-kvm -hda /dev/kvm_sdb/geust_root -m 1024 -net tap -net 
>> nic,vlan=0,macaddr=00:16:3e:00:00:02 -daemonize -nographic -smp 2
>>
>> The problem is that when the guest (also CentOS 5.1 x86_64) utilizes the 
>> network heavily (scp to a machine on the same switch, around 12 mbyte/s) 
>> the network on the virtual machine just drops out.
>>
>> I can no longer ping the virtual machine, and any existing SSH sessions 
>> die. If I connect to the virtual machine using VNC everything looks okay 
>> (eth0 is up, routes are okay), but I still cannot connect to anything. 
>> All other virtual machines on the same host continue to work as if 
>> nothing has happened. The same problem occurred in -58 and -59.
>>
>> /var/log/messages on the guest says:
>> NETDEV WATCHDOG: eth0: transmit timed out
>> eth0: link up, 100Mbps, full-duplex, lpa 0x05E1
>>
>> Any suggestions (permanent fixes or temporary workarounds, I'll take 
>> what you got) would be much appreciated.
>>
>> Thanks for all the great work :)
>> -Arne
>>
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