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45cc8519f5
Booting an amd64 kernel on Firecracker with 1 CPU and 128 MB of RAM,
SYSINIT cpu takes roughly 2770 us:
* 2280 us in vm_ksubmap_init
* 535 us in kmem_malloc
* 450 us in pmap_zero_page
* 1720 us in pmap_growkernel
* 1620 us in pmap_zero_page
* 80 us in bufinit
* 480 us in cpu_setregs
* 430 us in cpu_setregs calling load_cr0
Much of this is hypervisor overhead: load_cr0 is slow because it traps
to the hypervisor, and 99% of the time in pmap_zero_page is spent when
we first touch the page, presumably due to the host Linux kernel
faulting in backing pages one by one.
Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D40327
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| conf | ||
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| include | ||
| linux | ||
| linux32 | ||
| pci | ||
| sgx | ||
| vmm | ||
| Makefile | ||