[Bug 1900773] Re: ARM servers timeout downloading initrd

[dann frazier]

I am able to reproduce w/ focal as well. The above patch is tagged as
"Fixes: 781b3e5efc3 (tftp: Do not use priority queue)", which is in
focal (d/p/0090-tftp-Do-not-use-priority-queue.patch). However, it
wasn't added until 2.04-1ubuntu26.1. My guess is that it was not
reproducible in Comment #12 because that test may have used the original
GA image from 2.04-1ubuntu26[1] instead of the latest[2]. @Tai can you
confirm?

[1] http://ports.ubuntu.com/ubuntu-ports/dists/focal/main/uefi/grub2-arm64/current/grubnetaa64.efi
[2] http://ports.ubuntu.com/ubuntu-ports/dists/focal-updates/main/uefi/grub2-arm64/current/grubnetaa64.efi


** Also affects: grub2 (Ubuntu Groovy)
   Importance: Undecided
       Status: Confirmed

** Also affects: livecd-rootfs (Ubuntu Groovy)
   Importance: Undecided
       Status: Invalid

** Also affects: grub2 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: grub2 (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: livecd-rootfs (Ubuntu Focal)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1900773

Title:
  ARM servers timeout downloading initrd

Status in Release Notes for Ubuntu:
  New
Status in grub2 package in Ubuntu:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in grub2 source package in Focal:
  Confirmed
Status in livecd-rootfs source package in Focal:
  Invalid
Status in grub2 source package in Groovy:
  Confirmed
Status in livecd-rootfs source package in Groovy:
  Invalid

Bug description:
  groovy-live-server-arm64.iso 20201020.1

  When attempting to netboot subiquity on a Cavium ThunderX CRB2S, the
  system always times out downloading the initrd - see below. It seems
  the initrd, which is LZ4 compressed to 87M, is just too large. If I
  recompress the initrd using lzma - shrinking it to 44M, I am able to
  boot it. While that successfully works around the issue, I wouldn't
  expect the average user to know to do it.

                           GNU GRUB  version 2.04

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        Use the  and  keys to select which entry is highlighted.          
        Press enter to boot the selected OS, `e' to edit the commands       
        before booting or `c' for a command-line.                           

  error: timeout reading `initrd'.

  Press any key to continue...

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