[Bug 1508893] Re: TFTP timeout when booting from grub that was PXE loaded

[Newell Jensen]

I tested this on wily, vivid, and trusty.  Marking as verification-done.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1508893

Title:
  TFTP timeout when booting from grub that was  PXE loaded

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Trusty:
  Fix Released
Status in grub2 source package in Vivid:
  Fix Committed
Status in grub2 source package in Wily:
  Fix Committed

Bug description:
  [Impact]
  PXE booting of UEFI systems is very slow, to the point that some systems timeout.

  [Test Case]
  PXE boot a UEFI-based system (d-i or MAAS) and monitor the time it takes for GRUB to download the kernel/initrd. tcpdump will show TFTP timeouts, and it can take on the order of minutes to begin running the kernel.

  [Regression Risk]
  The fix is restricted to UEFI-based systems. For those systems, it could lead to a regression if Managed Network Protocol is required to remain active while GRUB is performing the network boot.

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