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Date: Wed, 19 Jun 2013 09:09:20 -0500 From: Seth Jennings <sjenning@...ux.vnet.ibm.com> To: Bob Liu <lliubbo@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Nitin Gupta <ngupta@...are.org>, Minchan Kim <minchan@...nel.org>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Dan Magenheimer <dan.magenheimer@...cle.com>, Robert Jennings <rcj@...ux.vnet.ibm.com>, Jenifer Hopper <jhopper@...ibm.com>, Mel Gorman <mgorman@...e.de>, Johannes Weiner <jweiner@...hat.com>, Rik van Riel <riel@...hat.com>, Larry Woodman <lwoodman@...hat.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Dave Hansen <dave@...1.net>, Joe Perches <joe@...ches.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Cody P Schafer <cody@...ux.vnet.ibm.com>, Hugh Dickens <hughd@...gle.com>, Paul Mackerras <paulus@...ba.org>, Linux-MM <linux-mm@...ck.org>, Linux-Kernel <linux-kernel@...r.kernel.org>, devel@...verdev.osuosl.org Subject: Re: [PATCHv13 3/4] zswap: add to mm/ On Mon, Jun 17, 2013 at 02:20:05PM +0800, Bob Liu wrote: > Hi Seth, > > On Tue, Jun 4, 2013 at 4:33 AM, Seth Jennings > <sjenning@...ux.vnet.ibm.com> wrote: > > zswap is a thin backend for frontswap that takes pages that are in the process > > of being swapped out and attempts to compress them and store them in a > > RAM-based memory pool. This can result in a significant I/O reduction on the > > swap device and, in the case where decompressing from RAM is faster than > > reading from the swap device, can also improve workload performance. > > > > It also has support for evicting swap pages that are currently compressed in > > zswap to the swap device on an LRU(ish) basis. This functionality makes zswap a > > true cache in that, once the cache is full, the oldest pages can be moved out > > of zswap to the swap device so newer pages can be compressed and stored in > > zswap. > > > > This patch adds the zswap driver to mm/ > > > > Do you have any more benchmark can share with me ? To figure out that > we can benefit from zswap. The two I've done or kernbench and SPECjbb. I'm trying out the memtests now. I'd like to be able to explain the numbers you are seeing at least. Sorry for the delay. I'll get back to you once I've figured out how to using mmtests and get some results/explanations. Also, how much physical RAM did this box have? I see 2G in the profile name but not sure if that is the workload size or the RAM size. I seems that the test is overcommitted from the beginning as indicated by the swap activity. I know that the parallelio-memcachetest default profile only uses 80% of physical memory, so you have apparently made a change yes? Seth > > I found zswap will cause performance drop when using mmtests-0.10 to test it. > The config file I'm using is: config-global-dhp__parallelio-memcachetest > > The result is: > (v3.10-rc4-2G-nozswap was without zswap but the performance is better.) > > v3.10-rc4 v3.10-rc4 > 2G-zswap-base 2G-nozswap > Ops memcachetest-0M 604.00 ( 0.00%) 1077.00 ( 78.31%) > Ops memcachetest-198M 630.00 ( 0.00%) 1007.00 ( 59.84%) > Ops memcachetest-430M 609.00 ( 0.00%) 939.00 ( 54.19%) > Ops memcachetest-661M 604.00 ( 0.00%) 845.00 ( 39.90%) > Ops memcachetest-893M 591.00 ( 0.00%) 839.00 ( 41.96%) > Ops memcachetest-1125M 599.00 ( 0.00%) 781.00 ( 30.38%) > Ops memcachetest-1356M 588.00 ( 0.00%) 771.00 ( 31.12%) > Ops io-duration-0M 0.00 ( 0.00%) 1.00 (-99.00%) > Ops io-duration-198M 177.00 ( 0.00%) 21.00 ( 88.14%) > Ops io-duration-430M 168.00 ( 0.00%) 25.00 ( 85.12%) > Ops io-duration-661M 214.00 ( 0.00%) 30.00 ( 85.98%) > Ops io-duration-893M 186.00 ( 0.00%) 32.00 ( 82.80%) > Ops io-duration-1125M 175.00 ( 0.00%) 42.00 ( 76.00%) > Ops io-duration-1356M 245.00 ( 0.00%) 51.00 ( 79.18%) > Ops swaptotal-0M 487760.00 ( 0.00%) 459754.00 ( 5.74%) > Ops swaptotal-198M 563581.00 ( 0.00%) 485194.00 ( 13.91%) > Ops swaptotal-430M 579472.00 ( 0.00%) 500817.00 ( 13.57%) > Ops swaptotal-661M 568086.00 ( 0.00%) 524209.00 ( 7.72%) > Ops swaptotal-893M 584405.00 ( 0.00%) 509846.00 ( 12.76%) > Ops swaptotal-1125M 572992.00 ( 0.00%) 534115.00 ( 6.78%) > Ops swaptotal-1356M 573259.00 ( 0.00%) 529814.00 ( 7.58%) > Ops swapin-0M 231250.00 ( 0.00%) 236069.00 ( -2.08%) > Ops swapin-198M 312259.00 ( 0.00%) 239149.00 ( 23.41%) > Ops swapin-430M 327178.00 ( 0.00%) 246803.00 ( 24.57%) > Ops swapin-661M 319575.00 ( 0.00%) 273644.00 ( 14.37%) > Ops swapin-893M 328195.00 ( 0.00%) 257327.00 ( 21.59%) > Ops swapin-1125M 317345.00 ( 0.00%) 271109.00 ( 14.57%) > Ops swapin-1356M 312858.00 ( 0.00%) 266050.00 ( 14.96%) > Ops minorfaults-0M 592150.00 ( 0.00%) 646076.00 ( -9.11%) > Ops minorfaults-198M 637339.00 ( 0.00%) 676441.00 ( -6.14%) > Ops minorfaults-430M 626228.00 ( 0.00%) 684715.00 ( -9.34%) > Ops minorfaults-661M 625089.00 ( 0.00%) 670639.00 ( -7.29%) > Ops minorfaults-893M 612877.00 ( 0.00%) 669723.00 ( -9.28%) > Ops minorfaults-1125M 624800.00 ( 0.00%) 667025.00 ( -6.76%) > Ops minorfaults-1356M 618800.00 ( 0.00%) 657600.00 ( -6.27%) > Ops majorfaults-0M 67664.00 ( 0.00%) 40060.00 ( 40.80%) > Ops majorfaults-198M 72377.00 ( 0.00%) 39517.00 ( 45.40%) > Ops majorfaults-430M 71822.00 ( 0.00%) 38895.00 ( 45.85%) > Ops majorfaults-661M 70009.00 ( 0.00%) 39625.00 ( 43.40%) > Ops majorfaults-893M 74988.00 ( 0.00%) 38073.00 ( 49.23%) > Ops majorfaults-1125M 72458.00 ( 0.00%) 38206.00 ( 47.27%) > Ops majorfaults-1356M 70549.00 ( 0.00%) 37430.00 ( 46.94%) > > Regards, > -Bob -- 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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