Public bug reported:
If I use the grub-mknetdir command with grub-efi-amd64 v 2.02~beta2-29
as follows:
grub-mknetdir -d /usr/lib/grub/x86_64-efi --net-
directory=/var/lib/tftpboot --subdir=grub2-efi
to generate a PXE environment, and then boot a UEFI VM (or physical box)
using this PXE environment, loading the kernel and initrd via TFTP takes
a very long time (several minutes). This is due to a bug where grub2
doesn't open the protocol stack in exclusive mode and therefore doesn't
actually end up receiving all the TFTP packets.
I have rebuilt the grub package with the attached patch (from fedora)
and this completely fixes the problem, and the kernel and initrd take
only a few seconds to load.
Cheers
David
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "Patch from fedora which fixes the problem"
https://bugs.launchpad.net/bugs/1514038/+attachment/4514683/+files/0138-reopen-SNP-protocol-for-exclusive-use-by-grub.patch
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https://bugs.launchpad.net/bugs/1514038
Title:
grub2 UEFI PXE loads kernel/initrd very very slowly.
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