** Description changed:
- Improve transfer speed.
- Support more NICs.
- Speed up tsc calibration.
+ [Impact]
+
+ * There have been multiple reports on netboot failures using
+ grubnetx64.efi. This backport attempts to cherrypick multiple patches to
+ improve the netboot speed and hopefully reliability. Also timeouts.
+
+ TCP window scaling is improved for faster data transfers.
+ Support for larger link layer addresses is added.
+ tsc-calibration is sped up - as it can take up to 51s currently for grub to
fail to calibrate on some hardware configurations.
+
+ All of the above should not break network boot deployments, and
+ hopefully make them more reliable. Reliability of deployments is yet to
+ be determined however.
+
+ [Test Case]
+
+ * Let's ensure that network stack and network deplopad.lv/u/yments
+ still operate correctly
+
+ * Deploy MAAS
+
+ * In /var/snap/maas/common, find the symlinks to grubx64.efi file which
+ is signed grub net x64 EFI prebuilt app from grub2-signed package
+
+ * Replace it with the /usr/lib/grub/x86_64-efi-
+ signed/grubnetx64.efi.signed file from the grub2-signed package
+
+ * Deploy a UEFI machine with MAAS
+
+ * Observe that deployment is successful.
+
+ [Where problems could occur]
+
+ * The networking code in grub is changed, thus issues could happen in
+ the network deployments of grub over pxe-boot / uefi-boot and similar.
+ For example some machines/cards may have started to work (and previously
+ didn't, and ended up booting off local drive) or stopped to work (thus
+ failing to boot remotely).
+
+ [Other Info]
+
+ * These changes have been tested in MAAS on x86 UEFI already using the
hirsute build of grub2.
** Also affects: grub2 (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: grub2 (Ubuntu Hirsute)
Status: New => Fix Released
** Changed in: grub2 (Ubuntu Focal)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1911439
Title:
Netboot improvements backport from hirsute
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