On 2/26/15, 12:08 PM, "Gary E. Miller" <g...@rellim.com> wrote:
>Yo Richard! > >On Thu, 26 Feb 2015 10:08:05 +0100 >Richard Cochran <richardcoch...@gmail.com> wrote: > >> On Thu, Feb 26, 2015 at 12:18:48AM -0800, Gary E. Miller wrote: >> > So the three I have on the recommmended list are not good? Yeah, I >> > gotta agree. >> >> You have these three, I217-LM, 82574, and I210? >> >> - I217-LM HW bug >> - 82574 not a great ptp design >> - I210 best PCIe card I have tried > >Yup. And my hardware timestamping experience: > > - I217-LM HW bug > - 82574 6 mSec or worse jitter > - I210 300 to 900 mSec persistent offset Woah. I wouldn't have expected that (at least, I've never seen that with I210). That's approaching "broken BIOS/platform" levels of bad. If you could provide some more information (test environment, what you're connecting to, driver version, kernel version, platform, yadda yadda) for I210/igb we will forward it along internally. One other tidbit is that I210 supports EEE, which can affect jitter, although I wouldn't expect it on that level. You can try turning this off via ethtool (ethtool --set-eee ethX eee off) to see if that helps. Cheers, Matthew ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
