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
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