On Thu, 2013-12-19 at 09:16 +0000, Ledda William EXT wrote: > Hi all, > > I was querying timestamp capabilities of an interface with ethtool -T > and I found the following > > > > Hardware Receive Filter Modes: > > none (HWTSTAMP_FILTER_NONE) > > all (HWTSTAMP_FILTER_ALL) > > ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC) > > ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) > > ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC) > > ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) > > ptpv2-l2-sync (HWTSTAMP_FILTER_PTP_V2_L2_SYNC) > > ptpv2-l2-delay-req (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) > > ptpv2-event (HWTSTAMP_FILTER_PTP_V2_EVENT) > > ptpv2-sync (HWTSTAMP_FILTER_PTP_V2_SYNC) > > ptpv2-delay-req (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ) > > >
The above filters are just all the available ones. The 'good' filter is ptpv2-event and all. The peer delay and request filters aren't even listed here! (You can see how old and crummy the hwtstamp_ioctl interface is....) Essentially you only need ptpv2-event to support timestamping the correct list. If you're in slave only mode you need to be able to timestamp only sync (and peer messages in P2P mode). But having extra filters doesn't really buy anything as if you can timestamp ptpv2-event packets you can timestamp any packet needed by ptp4l. The other filters are available as historically the interface supported them, even if it wasn't really useful. Regards, Jake > > > > I’m curios to understand the meaning of the different filters in > particular those related to PTP. Can I found some benefit from them? > I mean… if an interface with those filter is “better” than one that > doesn’t has them? > > As long as the interface has ptpv2-event it is consistently more useful than an interface which does not. However the other filters are not useful (IMHO). Ofcourse timestamp all packets is the most useful. > > Thank you > > > > William > > > > > ------------------------------------------------------------------------------ > Rapidly troubleshoot problems before they affect your business. Most IT > organizations don't have a clear picture of how application performance > affects their revenue. With AppDynamics, you get 100% visibility into your > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > _______________________________________________ > Linuxptp-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/linuxptp-users ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Linuxptp-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxptp-users
