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The EFI block protocol issued one 512 B virtio request per sector, so GRUB loading a kernel and initrd took ~150k VM exits. Let SectorRead/SectorWrite take any multiple of 512 bytes under 1 MiB and pass each ReadBlocks/WriteBlocks call through as a single request. Boot to first kernel line drops from 1.4s to 0.70s on a m5zn.metal. Signed-off-by: Evan Almloff <evanalmloff@gmail.com>
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The EFI block protocol issued one 512 B virtio request per sector, so GRUB loading a kernel and initrd took ~150k VM exits. Let SectorRead/SectorWrite take any multiple of 512 bytes under 1 MiB and pass each ReadBlocks/WriteBlocks call through as a single request. Boot to first kernel line drops from 1.4s to 0.70s on a m5zn.metal.
A couple runs of a benchmark script booting jammy with this branch on m5zn.metal: