[TriLUG] CentOS 6 with kernel v3 - bonding interface drops

[Jack Hill via TriLUG]

On Wed, 18 Feb 2015, Ron Kelley via TriLUG wrote:

> Greetings all,
>
> Running a couple of backup servers with CentOS6 with two 10G bonded 
> NICs.  If I boot a v3 kernel (3.14, 3.19, etc), I see a ton of dropped 
> packets on my bonded interface.  I tried various flavors of bonding to 
> pinpoint the issue (mode-1, mode-6, etc), and all show the same drops. 
> However, if I drop back to the standard CentOS 6 kernel (2.6.32) I don’t 
> see the same behavior.

Ron,

I believe that I've seen this before (on Ubuntu) with newer kernels. My 
recollection is that the way Linux reports dropped packets changed at some 
point. Some quick searching found

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/890475
and
https://www.novell.com/support/kb/doc.php?id=7007165

which seem related.

Sorry that I can't say for sure. Are you getting the performance that you 
expect from your interface?

Best,
Jack