Messages in this thread | | | Date | Mon, 27 Dec 2004 14:50:57 -0800 | From | "David S. Miller" <> | Subject | Re: Prezeroing V2 [0/3]: Why and When it works |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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