On Sat, May 25, 2013 at 10:41:39PM +0300, Or Gerlitz wrote:

On Sat, May 25, 2013 at 6:13 PM, Shawn Bohrer [off-list ref] wrote:
[...]

quoted

5. Debugging I noticed that tcpdump on machine #1 or #2 caused them to
suddenly receive data, and simply putting the interface in promiscuous
mode had the same result.  I rebooted both machine #1 and #2 several
times and each time they had the same issue.  I then rebooted them
back into 3.4 and they both functioned as expected and received data
on all 350 groups.  Rebooted them both back into 3.10 and they were
both still broken.  This is when I sent my initial email to netdev.

[..]

Shawn, thanks for all the details, just one small confirmation, when
you moved from 3.4 to 3.10 have you done ANY change to your app? e.g
do you still use the same QP type (UD) or moved to RAW PACKET?

No modifications have been made to the application.  In this case I'm
using plain old UDP multicast sockets over 10g Ethernet.

--
Shawn