On 12/11/2012 08:51 AM, Alex Shi wrote: > On Mon, Dec 10, 2012 at 4:22 PM, Alex Shi <alex....@intel.com> wrote: >> This patchset base on tip/sched/core tree temporary, since it is more >> steady than tip/master. and it's easy to rebase on tip/master. >> >> It includes 3 parts changes. >> >> 1, simplified fork, patch 1~4, that simplified the fork/exec/wake log in >> find_idlest_group and select_task_rq_fair. it can increase 10+% >> hackbench process and thread performance on our 4 sockets SNB EP machine. >> >> 2, enable load average into LB, patch 5~9, that using load average in >> load balancing, with a runnable load value industrialization bug fix and >> new fork task load contrib enhancement. >> >> 3, power awareness scheduling, patch 10~18, >> Defined 2 new power aware policy balance and >> powersaving, and then try to spread or shrink tasks on CPU unit >> according the different scheduler policy. That can save much power when >> task number in system is no more then cpu number. > > tried with sysbench fileio test rndrw mode, with half thread of LCPU number, > performance is similar, power can save about 5~10 Watts on 2 sockets SNB EP > and NHM EP boxes.
Another testing of parallel compress with pigz on Linus' git tree. results show we get much better performance/power with powersaving and balance policy: testing command: #pigz -k -c -p$x -r linux* &> /dev/null On a NHM EP box powersaving balance performance x = 4 166.516 /88 68 170.515 /82 71 165.283 /103 58 x = 8 173.654 /61 94 177.693 /60 93 172.31 /76 76 On a 2 sockets SNB EP box. powersaving balance performance x = 4 190.995 /149 35 200.6 /129 38 208.561 /135 35 x = 8 197.969 /108 46 208.885 /103 46 213.96 /108 43 x = 16 205.163 /76 64 212.144 /91 51 229.287 /97 44 data format is: 166.516 /88 68 166.516: avagerage Watts 88: seconds(compress time) 68: scaled performance/power = 1000000 / time / power -- 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/