Increasing KVM

[Ian Campbell]

How exactly would I go about increasing KVM? I tried bumping up KVA_PAGES from 256 to 260, but all that did was cause page faults whenever apache (or fatboy, like in this case) was started... here's the error from /var/log/messages

Oct 24 14:51:12 qt20 /kernel:
Oct 24 14:51:12 qt20 /kernel:
Oct 24 14:51:12 qt20 /kernel: Fatal trap 12: page fault while in kernel mode
Oct 24 14:51:12 qt20 /kernel: mp_lock = 00000002; cpuid = 0; lapic.id = 00000000
Oct 24 14:51:12 qt20 /kernel: fault virtual address = 0xafcaae5c
Oct 24 14:51:12 qt20 /kernel: fault code = supervisor write, page not present
Oct 24 14:51:12 qt20 /kernel: instruction pointer = 0x8:0xb0257d11
Oct 24 14:51:12 qt20 /kernel: stack pointer = 0x10:0xe590ee40
Oct 24 14:51:12 qt20 /kernel: frame pointer = 0x10:0xe590ee4c
Oct 24 14:51:12 qt20 /kernel: code segment = base 0x0, limit 0xfffff, type 0x1b
Oct 24 14:51:12 qt20 /kernel: = DPL 0, pres 1, def32 1, gran 1
Oct 24 14:51:12 qt20 /kernel: processor eflags = interrupt enabled, resume, IOPL = 0
Oct 24 14:51:12 qt20 /kernel: current process = 250 (fatboy)
Oct 24 14:51:12 qt20 /kernel: interrupt mask = none <- SMP: XXX
Oct 24 14:51:12 qt20 /kernel: trap number = 12
Oct 24 14:51:12 qt20 /kernel: panic: page fault
Oct 24 14:51:12 qt20 /kernel: mp_lock = 00000002; cpuid = 0; lapic.id = 00000000
Oct 24 14:51:12 qt20 /kernel: boot() called on cpu#0
Oct 24 14:51:12 qt20 /kernel:
Oct 24 14:51:12 qt20 /kernel: syncing disks... 15 3

I remember reading somewhere that NKPT should also be increased if you're going to fiddle with KVA_PAGES, is that true? Clearly there's something I'm not doing, I remember reading about people cranking KVA_PAGES up to 768.

--Ian.



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