[ovs-discuss] Flow Expiration returning zeros for byte/packet counts
derickso at stanford.edu
Sun Nov 15 03:59:18 UTC 2009
Jesse Gross wrote:
> David Erickson wrote:
>> Jesse Gross wrote:
>>> David Erickson wrote:
>>>> The crux is the netflow message is matching the flow expiration.
>>>> There was nothing in the ovs-vswitchd.log file other than messages
>>>> about connecting to NOX and exiting fail-open mode, which was well
>>>> before this test was performed.
>>> Can you try turning off segmentation offload on the VM running
>>> Apache? Something like:
>>> ethtool -K eth0 tso off gso off
>> That fixed it.. is this something that needs to be done on every VM
>> or something that can be fixed in OVS?
> I'm going to fix the stats of segmented packets in OVS so that TSO
> doesn't need to be disabled.
> I also noticed that one of your other flows is off by the size of a
> TCP SYN packet. When you respond to a packet in do you send a packet
> out plus a flow mod or is it a flow mod with a buffer ID? If you send
> a separate packet out then that packet is not counted as part of any
I saw this as well, I'm sure its a packet out with or without buffer,
plus flowmod. I'm fine with being a packet off, its just being an order
of magnitude off and 10 meg off in traffic is a bit of a problem ;)
> Thanks for all your help in tracing down these issues.
Thank you for the fixes and great responses!
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