Bug 182917 - [igb] strange out traffic with igb interfaces
Summary: [igb] strange out traffic with igb interfaces
Status: Closed Feedback Timeout
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: Unspecified
Hardware: Any Any
: Normal Affects Only Me
Assignee: freebsd-net (Nobody)
Keywords: IntelNetworking
Depends on:
Reported: 2013-10-12 03:20 UTC by sh1970
Modified: 2018-05-28 20:55 UTC (History)
3 users (show)

See Also:


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Description sh1970 2013-10-12 03:20:00 UTC
We've got a strange problem with lagg(4) interfaces built on Intel's  
82580 chipset igb (dual port 1Gb card).
We cannot send over lagg interface more than ~1Gb/s, yet receiving  
~2GB over it.
Looks like something indicating the problem can be seen here:

anri@host:[8:13]~#ifstat -i lagg0 -i igb1 -i igb3 1
       lagg0                igb1                igb3
  KB/s in  KB/s out   KB/s in  KB/s out   KB/s in  KB/s out
  9116.50  26515.16   4147.70  28871.43   5004.86  23683.31
  8423.08  26544.62   3853.22  28980.60   4594.21  23520.97
  8796.48  26395.28   4248.46  28344.00   4567.42  23978.17

Note (IN) traffic - everything's ok, about 50% on each igb interfaces  
and total summary on lagg0.
But (OUT) traffic looks weird - there is more traffic on the single  
igb1 than on lagg0!
Tried with default driver came with the system, also the new one  
igb-2.3.10 from Intel site - no luck.

Set net.link.lagg.0.use_flowid=0 not solve the problem.

Testing lagg interface built on other cards (em, bce) on the same  
machine shows expected normal behavior for both directions.


My system is freebsd 8.4, use the e1000 driver from freebsd 8.3 , the result is OK .
Comment 1 Andrew Kinney 2013-11-07 00:30:08 UTC
With outbound bytes double the expected value on an igb interface, 
you're probably running into

Andrew Kinney
Comment 2 Mark Linimon freebsd_committer freebsd_triage 2013-11-07 02:48:47 UTC
Responsible Changed
From-To: freebsd-bugs->freebsd-net

Over to maintainer(s).
Comment 3 Sean Bruno freebsd_committer 2015-08-04 15:32:00 UTC
This seems related to the other issues where folks disable LRO.  Does this help with your test?
Comment 4 Eitan Adler freebsd_committer freebsd_triage 2018-05-28 19:44:45 UTC
batch change:

For bugs that match the following
-  Status Is In progress 
- Untouched since 2018-01-01.
- Affects Base System OR Documentation


Reset to open status.

I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.
Comment 5 Eugene Grosbein freebsd_committer 2018-05-28 20:55:08 UTC
Feedback timeout (over 2 years). Also, this is believed to work just fine for all supported branches.