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SubjectRe: 7.52 second kernel compile


On Mon, 18 Mar 2002, Cort Dougan wrote:
>
> } But the whole point of _scattering_ is so incredibly broken in itself!
> } Don't do it.
>
> Yes, that is indeed correct theoretically. The problem is that we actually
> measured it and there was very little locality. When I added some
> multiple-tlb loads it actually decreased wall-clock performance for nearly
> every user load I put on the machine.

This is what I meant by hardware support for multiple loads - you mustn't
let speculative TLB loads displace real TLB entries, for example.

> Linus, I knew that deep in my heart 8 years ago when I started in on all
> this. I'm with you but I'm not good enough with a soldering iron to fix
> every powerpc out there that forces that crappy IBM spawned madness upon
> us.

Oh, I agree, we can't fix existing broken hardware, we'll ave to just live
with it.

Linus

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