Messages in this thread | | | From | Jan Beulich <> | Subject | [PATCH 0/6] xen/x86: PV boot speedup | Date | Thu, 30 Sep 2021 14:33:20 +0200 |
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The observed (by the human eye) performance difference of early boot between native and PV-on-Xen was just too large to not look into. As it turns out, gaining performance back wasn't all that difficult.
While the series (re)introduces a small number of PTWR emulations on the boot path (from phys_pte_init()), there has been a much larger number of them post-boot. Hence I think if this was of concern, the post-boot instances would want eliminating first.
Some of the later changes aren'r directly related to the main goal of the series; these address aspects noticed while doing the investigation.
1: streamline set_pte_mfn() 2: restore (fix) xen_set_pte_init() behavior 3: adjust xen_set_fixmap() 4: adjust handling of the L3 user vsyscall special page table 5: there's no highmem anymore in PV mode 6: restrict PV Dom0 identity mapping
Jan
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