Messages in this thread | | | Date | Wed, 12 Jan 2005 10:43:26 -0800 | From | Andrew Morton <> | Subject | Re: page table lock patch V15 [0/7]: overview |
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Christoph Lameter <clameter@sgi.com> wrote: > > > Do we have measurements of the negative and/or positive impact on smaller > > machines? > > Here is a measurement of 256M allocation on a 2 way SMP machine 2x > PIII-500Mhz: > > Gb Rep Threads User System Wall flt/cpu/s fault/wsec > 0 10 1 0.005s 0.016s 0.002s 54357.280 52261.895 > 0 10 2 0.008s 0.019s 0.002s 43112.368 42463.566 > > With patch: > > Gb Rep Threads User System Wall flt/cpu/s fault/wsec > 0 10 1 0.005s 0.016s 0.002s 54357.280 53439.357 > 0 10 2 0.008s 0.018s 0.002s 44650.831 44202.412 > > So only a very minor improvements for old machines (this one from ~ 98).
OK. But have you written a test to demonstrate any performance regressions? From, say, the use of atomic ops on ptes? - 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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