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

[Kamal Mostafa]

Adam, there's a bug in your version of the patch "efi_disk_cache.patch":

  +#define GRUB_DISK_CACHE_SIZE   1024
  +#define GRUB_DISK_CACHE_BITS   8                     <---- SHOULD BE "10"

You may have been misled by Manoj's suggestion of trying BITS==8...
But note that 2^BITS must be kept == SIZE which isn't the case in your
version of the patch.

Anyway, I have determined that BITS==10, SIZE==1024 is a good value
performance-wise (and the blog poster suggests even higher: BITS==13).
I recommend that we stick with BITS==10, SIZE==1024.


** Changed in: grub2 (Ubuntu)
       Status: Fix Released => Confirmed

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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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