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SubjectRe: Prezeroing V2 [0/3]: Why and When it works
On Mon, Dec 27, 2004 at 02:50:57PM -0800, David S. Miller wrote:
> On Fri, 24 Dec 2004 10:21:24 -0800 (PST)
> Linus Torvalds <torvalds@osdl.org> wrote:
>
> > Absolutely. I would want to see some real benchmarks before we do this.
> > Not just some microbenchmark of "how many page faults can we take without
> > _using_ the page at all".
>
> Here's my small contribution. I did three "make -j3 vmlinux" timed
> runs, one running a kernel without the pre-zeroing stuff applied,
> one with it applied. It did shave a few seconds off the build
> consistently. Here is the before:
>
> real 8m35.248s
> user 15m54.132s
> sys 1m1.098s
>
> real 8m32.202s
> user 15m54.329s
> sys 1m0.229s
>
> real 8m31.932s
> user 15m54.160s
> sys 1m0.245s
>
> and here is the after:
>
> real 8m29.375s
> user 15m43.296s
> sys 0m59.549s
>
> real 8m28.213s
> user 15m39.819s
> sys 0m58.790s
>
> real 8m26.140s
> user 15m44.145s
> sys 0m58.872s

Christopher and other SGI fellows,

Get your patch into STP, once its there we can do some wider x86 benchmarking
easily.

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