[Bug 944347] Re: linux and initrd load very slowly on UEFI system
Kamal Mostafa
kamal at canonical.com
Tue Mar 6 17:08:44 UTC 2012
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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