[ntp:questions] Intel i210 and timed transmission (802.1Qav)

Jonatan Walck jwalck at netnod.se
Wed Oct 31 13:55:28 UTC 2012


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I'm researching how to increase the precision one can achieve by using
our NTP-servers, and bumped into this chip (Intel i210) today. It seem
that 802.1Qav support adds "LaunchTime", to tell the transmit buffer
when a packet is supposed to go out on the wire.

Is it just me or could this be used in conjunction with T4 in the
NTP-packet for increased precision, just as the goal with interleaved
mode?

At the same time the chip, just as Intel 82580 and i350, supports
per-packet timestamping on the RX side.

Any comments? Given that i210 is supposed to replace 82574 it should
hopefully be found "everywhere" quite soon.

Announcement:
http://communities.intel.com/community/wired/blog/2012/10/18/i210-launch-announcement

Product brief:
http://www.intel.com/content/www/us/en/ethernet-controllers/i210-ethernet-controller-family-brief.html

Datasheet (specifically 7.2.2.2.3):
http://www.intel.com/content/www/us/en/ethernet-controllers/i210-ethernet-controller-datasheet.html

// Jonatan Walck
   Netnod Internet Exchange
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