On Fri, Jun 21, 2013 at 08:20:34AM -0700, Dan Magenheimer wrote: > > From: Bob Liu [mailto:lliu...@gmail.com] > Subject: Re: [PATCHv13 3/4] zswap: add to mm/ > > > > On Thu, Jun 20, 2013 at 10:23 PM, Seth Jennings > > <sjenn...@linux.vnet.ibm.com> wrote: > > > On Thu, Jun 20, 2013 at 05:42:04PM +0800, Bob Liu wrote: > > >> > Just made a mmtests run of my own and got very different results: > > >> > > > >> > > >> It's strange, I'll update to rc6 and try again. > > >> By the way, are you using 824 hardware compressor instead of lzo? > > > > > > My results where using lzo software compression. > > > > > > > Thanks, and today I used another machine to test zswap. > > The total ram size of that machine is around 4G. > > This time the result is better: > > rc6 > > rc6 > > zswap > > base > > Ops memcachetest-0M 14619.00 ( 0.00%) 15602.00 ( > > 6.72%) > > Ops memcachetest-435M 14727.00 ( 0.00%) 15860.00 ( > > 7.69%) > > Ops memcachetest-944M 12452.00 ( 0.00%) 11812.00 ( > > -5.14%) > > Ops memcachetest-1452M 12183.00 ( 0.00%) 9829.00 > > (-19.32%) > > Ops memcachetest-1961M 11953.00 ( 0.00%) 9337.00 > > (-21.89%) > > Ops memcachetest-2469M 11201.00 ( 0.00%) 7509.00 > > (-32.96%) > > Ops memcachetest-2978M 9738.00 ( 0.00%) 5981.00 > > (-38.58%) > > Ops io-duration-0M 0.00 ( 0.00%) 0.00 ( > > 0.00%) > > Ops io-duration-435M 10.00 ( 0.00%) 6.00 ( > > 40.00%) > > Ops io-duration-944M 19.00 ( 0.00%) 19.00 ( > > 0.00%) > > Ops io-duration-1452M 31.00 ( 0.00%) 26.00 ( > > 16.13%) > > Ops io-duration-1961M 40.00 ( 0.00%) 35.00 ( > > 12.50%) > > Ops io-duration-2469M 45.00 ( 0.00%) 43.00 ( > > 4.44%) > > Ops io-duration-2978M 58.00 ( 0.00%) 53.00 ( > > 8.62%) > > Ops swaptotal-0M 56711.00 ( 0.00%) 8.00 ( > > 99.99%) > > Ops swaptotal-435M 19218.00 ( 0.00%) 2101.00 ( > > 89.07%) > > Ops swaptotal-944M 53233.00 ( 0.00%) 98055.00 > > (-84.20%) > > Ops swaptotal-1452M 52064.00 ( 0.00%) 145624.00 > > (-179.70%) > > Ops swaptotal-1961M 54960.00 ( 0.00%) 153907.00 > > (-180.03%) > > Ops swaptotal-2469M 57485.00 ( 0.00%) 176340.00 > > (-206.76%) > > Ops swaptotal-2978M 77704.00 ( 0.00%) 182996.00 > > (-135.50%) > > Ops swapin-0M 24834.00 ( 0.00%) 8.00 ( > > 99.97%) > > Ops swapin-435M 9038.00 ( 0.00%) 0.00 ( > > 0.00%) > > Ops swapin-944M 26230.00 ( 0.00%) 42953.00 > > (-63.76%) > > Ops swapin-1452M 25766.00 ( 0.00%) 68440.00 > > (-165.62%) > > Ops swapin-1961M 27258.00 ( 0.00%) 68129.00 > > (-149.94%) > > Ops swapin-2469M 28508.00 ( 0.00%) 82234.00 > > (-188.46%) > > Ops swapin-2978M 37970.00 ( 0.00%) 89280.00 > > (-135.13%) > > Ops minorfaults-0M 1460163.00 ( 0.00%) 927966.00 ( > > 36.45%) > > Ops minorfaults-435M 954058.00 ( 0.00%) 936182.00 ( > > 1.87%) > > Ops minorfaults-944M 972818.00 ( 0.00%) 1005956.00 ( > > -3.41%) > > Ops minorfaults-1452M 966597.00 ( 0.00%) 1035465.00 ( > > -7.12%) > > Ops minorfaults-1961M 976158.00 ( 0.00%) 1049441.00 ( > > -7.51%) > > Ops minorfaults-2469M 967815.00 ( 0.00%) 1051752.00 ( > > -8.67%) > > Ops minorfaults-2978M 988712.00 ( 0.00%) 1034615.00 ( > > -4.64%) > > Ops majorfaults-0M 5899.00 ( 0.00%) 9.00 ( > > 99.85%) > > Ops majorfaults-435M 2684.00 ( 0.00%) 67.00 ( > > 97.50%) > > Ops majorfaults-944M 4380.00 ( 0.00%) 5790.00 > > (-32.19%) > > Ops majorfaults-1452M 4161.00 ( 0.00%) 9222.00 > > (-121.63%) > > Ops majorfaults-1961M 4435.00 ( 0.00%) 8800.00 > > (-98.42%) > > Ops majorfaults-2469M 4555.00 ( 0.00%) 10541.00 > > (-131.42%) > > Ops majorfaults-2978M 6182.00 ( 0.00%) 11618.00 > > (-87.93%) > > > > > > But the performance of the first machine I used whose total ram size > > is 2G is still bad. > > I need more time to summarize those testing results. > > > > Maybe you can also have a try with lower total ram size. > > > > -- > > Regards, > > --Bob > > > A very important factor that you are not considering and > that might account for your different results is the > "initial conditions". For example, I always ran my benchmarks > after a default-configured EL6 boot, which launches many services > at boot time, each of which creates many anonymous pages, > and these "service anonymous pages" are often the pages > that are selected by LRU for swapping, and compressed by zcache/zswap. > Someone else may run the benchmarks on a minimally-configured > embedded system, and someone else on a single-user system > with no services running at all. A single-user system with > no services is often best for reproducing benchmark results but > may not be at all representative of the real world.
Right. And interestingly enough the kernbench recommends that model so that it is easier to reproduce. > > At a minimum, it would be good to always record "Active(anon)" > and "Inactive(anon)" in addition to the amount of physical > RAM in the system. (Note, in /proc/meminfo on my system, > the sum of these don't add up to "AnonPages"... I'm not sure > why.) > > And of course, even if the number of anonymous pages is > the same, the _contents_ of those pages may be very different, > which will affect zcache/zswap density which may have > a large impact on benchmark results. > > Thanks, > Dan (T-minus two weeks and counting) > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
