[Bug 944347] Re: linux and initrd load very slowly on UEFI system

[Manoj Iyer]

Grub update broke booting on UEFI systems, I get a message saying "null
in the ring. Aborted. Press any key to exit." I think this is the result
of the BITS=8 vs BITS=10, as Kamal mentioned SIZE==2^BITS, setting
BITS=8 SIZE should be set to 2^8. The reason I suggested using BITS=8 is
that will correspond to the largest supported sector size on the disk,
which is 4K sector size. Kamals settings of BITS=10 will read more than
one sector at a time, it might consume more memory but might not cause
any harm. Since we have already tested BITS=10, I suggested we do what
Kamal suggested and what we have tested. Unless someone else has an
opposition to reading more than one largest supported disk sector at a
time.

** Changed in: grub2 (Ubuntu)
   Importance: High => Critical

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https://bugs.launchpad.net/bugs/944347

Title:
  linux and initrd load very slowly on UEFI system

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  On a Intel Tunnel Mountain system, grub2 loads from disk very slowly
  when booting with UEFI:  about 53 seconds to execute a pair of "linux"
  and "initrd" commands.

  Expected behavior:
      Load time for linux and initrd should be on order of 1 second.

  Problem observed with:
      grub2 (oneiric) 1.99-12ubuntu5
      grub2 (precise) 1.99-14ubuntu2
      Intel Tunnel Mountain UEFI BIOS version SDV.TM.B8 or SDV.TM.B9

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