1. 29 Aug, 2016 18 commits
  2. 25 Aug, 2016 5 commits
  3. 23 Aug, 2016 8 commits
  4. 22 Aug, 2016 1 commit
  5. 19 Aug, 2016 3 commits
  6. 18 Aug, 2016 5 commits
    • David Johnson's avatar
    • David Johnson's avatar
    • David Johnson's avatar
      Best effort to decrease dhclient latency on Ubuntu 16. · 5bc94e54
      David Johnson authored
      (AFAIK, nothing has changed about dhclient, etc... I just noticed on the
      Emulab d820s (which have BCM5720s, tg3 driver), the driver takes
      anywhere from 7-9 seconds to simply init the card and autoneg with the
      switch (I've seen worse times, too, i.e. 19 and 29 seconds!).)
      
      dhclient is happy to start sending requests on interfaces that have no
      carrier (gee, did it ever seem like a good idea to make that behavior
      optional???).  Thus, if we get stuck with a control net NIC that has a
      horribly long init/autoneg time, dhclient is far into its backoff
      strategy on the control net, when it doesn't need to be!  In addition to
      slow media negotiation, there are STP auto things that can further delay
      the forwarding state of a switch port (like the ProCurve "auto-edge"
      port setting that causes the switch to wait 3 seconds after media
      negotiation for a BPDU).  So we have to be a little smarter about
      bringing up the control net via DHCP.
      
      So to combat these possible scenarios, we try two main things.
      
      First, we modify findcnet to wait for one of two things to be true
      before we start dhclient at all (or until a 6-second timeout is
      reached): 1) if we have a previous control net device in
      /var/lib/dhcp/dhclient.leases, we wait for that to come up; or 2) if we
      don't have a previous control net device (i.e. first boot of an image),
      we wait for at least one device to obtain carrier.  We could increase
      the 6-second timeout, but we'll wait on that for now; this should be
      good for now.
      
      Second, we set initial-delay and initial-interval both to 3 seconds in
      dhclient.conf ; hopefully this will give STP protection schemes a chance
      to have gotten things straight by the time dhclient makes its first
      retransmit.
      
      I tried adding a forced 'ifconfig <X> up' to the udev interface handler
      script, just to try to kick the device into autoneg mode ASAP, but of
      course that didn't help anything.
      
      I cannot improve on this unless we move to a split, managed dhclient
      scheme, where we actually run a dhclient for each interface, and control
      the backoff time much more tightly.  For now, I don't want to do either
      of these things.
      5bc94e54
    • Mike Hibler's avatar
      Yet another new version. · 5b941237
      Mike Hibler authored
      5b941237
    • Robert Ricci's avatar
      Fix mail sending when $mailfrom is not set · 27ff9193
      Robert Ricci authored
      27ff9193