On 06/02/2017 09:08 AM, Ben Pfaff wrote:
ipfix_cache_entry_init() initializes the start and end to be the same:xgettimeofday(&now); entry->flow_end_timestamp_usec = now.tv_usec + 1000000LL * now.tv_sec; entry->flow_start_timestamp_usec = entry->flow_end_timestamp_usec; and then I don't see anything that ever updates the "end" time. I guess that's the issue.
From looking at the code it appears to me that the ipfix_cache_update() function isn't doing anything to update the time stamps. It updates the stats but the stats function doesn't update time stamps. From what I can tell though that seems the place where it should be updated. I can try whipping up a bug fix patch for this if ipfix_cache_update() is the right place to do the time stamp update. - Greg
On Fri, Jun 02, 2017 at 01:57:01PM +0200, Felix Konstantin Maurer wrote: > I just took a look at the code, and I think it should work, as the the > timestamps are properly updated in ipfix_cache_aggregate_entries. > However, I don't know the code base well or C for that matter. > Can you point me to where the time values are not properly set? > > Regards > Felix > > On 05/31/2017 05:27 PM, Ben Pfaff wrote: >> On Wed, May 31, 2017 at 03:05:45PM +0200, Felix Konstantin Maurer wrote: >>> I'm currently trying to export flow statistics from an Openvswitch >>> bridge with IPFIX. It works, however in almost all packets, the >>> flowStartDeltaMicroseconds and the flowEndDeltaMicroseconds have the >>> same value. Is that to be expected? Do I misunderstand something? >>> >>> I expected them to be different and to allow me to calculate over which >>> time period the octetDeltaCount number of bytes of the flow had been sent. >> >> The IPFIX code hard-codes the start and end times to the same value. >> It's too bad--it would be nice to have this be more accurate. I don't >> know how difficult that would be. >> > > -- > RWTH Aachen University > Communication and Distributed Systems > http://www.comsys.rwth-aachen.de > _______________________________________________ discuss mailing list disc...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
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