Re: [CentOS-virt] NIC Stability Problems Under Xen 4.4 / CentOS 6 / Linux 3.18

2017-01-31 Thread Adi Pircalabu 

On 31/01/17 21:00, Jinesh Choksi wrote:

On 30 January 2017 at 22:17, Adi Pircalabu wrote:

May I chip in here? In our environment we're randomly seeing:

Jan 17 23:40:14 xen01 kernel: ixgbe :04:00.1 eth6: Detected Tx
Unit Hang


Someone in this thread: https://sourceforge.net/p/e1000/bugs/530/#2855 
  reported that /"With these kernels I was only able to work around the 
issue by disabling tx-checksumming offload with ethtool."/


However, that was reported for Kernels 4.2.6 / 4.2.8 / 4.4.8 and 4.4.10. 
I just thought it could be something you could rule out and hence 
mentioned it:


ethtool --offload eth6 rx off tx off


Another thing to rule out in case its a regression with Intel NICs and TSO:

# tso => tcp-segmentation-offload
# gso => generic-segmentation-offload
# gro => generic-receive-offload
# sg => scatter-gather
# ufo => udp-fragmentation-offload (Cannot change)
# lro => large-receive-offload (Cannot change)

ethtool -K eth6 tso off gso off gro off sg off


Nice, useful information. I've just disabled tx & rx checksumming on all 
the 10Gb interfaces on the affected servers, see how it goes. But as I 
said yesterday, in our environment it takes months to replicate.


Thanks,

Adi Pircalabu
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Re: [CentOS-virt] NIC Stability Problems Under Xen 4.4 / CentOS 6 / Linux 3.18

2017-01-31 Thread Jinesh Choksi 
On 30 January 2017 at 22:17, Adi Pircalabu  wrote:

> May I chip in here? In our environment we're randomly seeing:
>
> Jan 17 23:40:14 xen01 kernel: ixgbe :04:00.1 eth6: Detected Tx Unit
> Hang
>

Someone in this thread: https://sourceforge.net/p/e1000/bugs/530/#2855
 reported that *"With these kernels I was only able to work around the
issue by disabling tx-checksumming offload with ethtool."*

However, that was reported for Kernels 4.2.6 / 4.2.8 / 4.4.8 and 4.4.10. I
just thought it could be something you could rule out and hence mentioned
it:

ethtool --offload eth6 rx off tx off


Another thing to rule out in case its a regression with Intel NICs and TSO:

# tso => tcp-segmentation-offload
# gso => generic-segmentation-offload
# gro => generic-receive-offload
# sg => scatter-gather
# ufo => udp-fragmentation-offload (Cannot change)
# lro => large-receive-offload (Cannot change)

ethtool -K eth6 tso off gso off gro off sg off
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