On 10/23/06, Avi Kivity <[email protected]> wrote:
Antonio Vargas wrote:
>>
>> I could do that, but I feel that's more brittle. I might need more (or
>> other) fields later on. It will also cost me more pushes on the stack
>> (no real performance or space impact, just C64-era frugality).
>
> maybe thats the mindsent needed to make these virtual cpu patches
> without eating away all the cpu power with more than needed
> abstractions ;)
>
Unfortunately not. Saving a cycle or two doesn't help when a vm exit
costs thousands of cycles, and worse, kills your tlb.
The key is eliminating unnecessary exits. I have plans for massively
optimizing the mmu virtualization, and the next AMD core will do that in
hardware (look for a "nested page tables" sticker before you buy).
yes, when I read the nested pages description in amd docs, i wondered
that the intel had nothing like that and would go much slower... amd
has worked a lot on the mmu things (like cr3-keyed tlb on k8 systems
to avoid emptying always at switch)
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
--
Greetz, Antonio Vargas aka winden of network
http://network.amigascne.org/
[email protected]
[email protected]
Every day, every year
you have to work
you have to study
you have to scene.
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