From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 18 Aug 2005 09:09:10 -0700 (PDT) From: Christoph Lameter Subject: Re: pagefault scalability patches In-Reply-To: <20050817174720.47ac351f.akpm@osdl.org> Message-ID: References: <20050817151723.48c948c7.akpm@osdl.org> <20050817163030.15e819dd.akpm@osdl.org> <20050817164456.77e8b85e.akpm@osdl.org> <17155.52686.309135.906824@wombat.chubb.wattle.id.au> <20050817174720.47ac351f.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: peterc@gelato.unsw.edu.au, torvalds@osdl.org, hugh@veritas.com, piggin@cyberone.com.au, linux-mm@kvack.org List-ID: On Wed, 17 Aug 2005, Andrew Morton wrote: > > Patched: > > > > Gb Rep Threads User System Wall flt/cpu/s fault/wsec > > 16 3 1 0.859s 64.994s 65.084s 47768.542 47771.664 > > Versus: > > > Unpatched: > > > > Gb Rep Threads User System Wall flt/cpu/s fault/wsec > > 16 3 1 0.757s 62.772s 63.052s 49515.393 49522.112 > > It got slower? For that sample yes. There is a certain unpredictability coming with NUMA systems. Memory placement affects the tests. This in the margin of error. Another test shows just the opposite: unpatched: Gb Rep Threads User System Wall flt/cpu/s fault/wsec 16 3 1 0.735s 64.074s 64.083s 48537.993 48519.120 16 3 2 0.773s 94.774s 49.046s 32923.047 63588.898 16 3 4 0.717s 87.110s 29.092s 35816.846 105117.121 16 3 8 0.677s 136.768s 21.069s 22886.951 145008.228 16 3 16 0.757s 288.464s 23.045s 10876.524 134128.797 16 3 32 13.612s 297.150s 23.034s 10122.600 134723.354 16 3 64 60.201s 318.414s 27.048s 8308.505 114470.017 16 3 128 279.422s 322.942s 41.063s 5222.299 75562.812 16 3 256 280.823s 146.732s 28.073s 7357.466 109486.455 16 3 512 282.124s 77.636s 24.023s 8743.940 129787.460 patched: Gb Rep Threads User System Wall flt/cpu/s fault/wsec 16 3 1 0.702s 62.858s 63.056s 49491.809 49489.633 16 3 2 0.734s 72.348s 38.004s 43043.199 82674.132 16 3 4 0.718s 76.552s 25.012s 40710.056 125186.047 16 3 8 0.782s 58.417s 12.020s 53137.972 257740.814 16 3 16 1.534s 93.568s 9.092s 33077.207 316995.454 16 3 32 3.297s 173.145s 9.078s 17828.534 321373.156 16 3 64 9.001s 445.874s 11.064s 6915.569 270213.663 16 3 128 27.157s 1500.321s 16.060s 2059.426 189481.849 16 3 256 25.647s 762.183s 8.083s 3992.895 355973.645 16 3 512 26.167s 407.595s 5.008s 7252.183 619054.581 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org