On 8/14/13 12:31 AM, "Richard Cochran" <[email protected]> wrote:
>On Tue, Aug 13, 2013 at 09:36:25PM +0000, Vick, Matthew wrote: >> >> For the occasional "hiccup" on the RJ45 side, if the 82576 tries to >> timestamp two outbound packets too quickly, it will fail to return the >> second one (since the hardware is busy timestamping the first one). >> >> What options are you running with ptp4l? -P should help reduce the >>number >> of failed timestamps on the RJ45 port. > >I don't think changing ptp4l's options makes any difference. That >program is single threaded, and it always waits for the time stamp >after sending an event message. This behavior is quite on purpose, >knowing that some of the hardware out there can only handle on at a >time. > >On the linuxptp-users list, Alexander also recently reported frequent >time stamp failures on peer delay request messages. It is beginning to >look like the 82576 has a bug in this regard. > >Thoughts? > >Thanks, >Richard I believe changing options does make a difference for the 82576. At least, I had issues with E2E in the past--I would need to re-test to confirm if there is still an issue or not. I remember getting Rx packets to be timestamped too close together, which the 82576 cannot support, but I did grab the tip of the ptp4l tree and not a stable release at the time. Adding Jake to the thread, since I'm fairly certain that Alexander was using a modified driver or stack to do something non-standard, so it wasn't a bug with the 82576. Jake, do you remember what the root cause was on that one? Cheers, Matthew ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
