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Date: Wed, 28 Mar 2007 13:45:11 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Christoph Lameter <clameter@....com> Cc: linux-kernel@...r.kernel.org, William Lee Irwin III <wli@...omorphy.com> Subject: Re: [RFC] i386: Remove page sized slabs for pgds and pmds On Wed, 28 Mar 2007 13:12:56 -0700 (PDT) Christoph Lameter <clameter@....com> wrote: > The benefit of preconstructed pgds and pmds in the i386 arch code seem to > be debatable. The performance measurements indicate that there may be a slight > benefit but it seems to almost vanish in the noise ratio. yeah, I did a couple hours testing with rc5, rc5+quicklists, rc5+quicklists+qlhack, where "qlhack" is my patch which removes the quicklists and mysteriously causes i386 to crash. I was testing 8-way x86_64 with patch-scripts (wildly fork-intensive), kernel build and lmbench. Basically I was unable to observe any statistically meaningful-looking differences between any of them. I would like to test qlhack on ia64, because ia64 puts pte-pages into the quicklists as well, but my ia64 machine is presently indisposed. My (much) preferred way to handle all this is to remove the quicklists from all architectures: just use alloc_page() and free_page() for pte pages, pmd pages, etc. I remain unaware of any testing whcih indicates that this would be a bad change. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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