On Wed, Dec 8, 2010 at 10:01 PM, Ben Gamari <bgamari.foss@xxxxxxxxx> wrote: >> Make sense to me. If Ben is busy, I will measure it and send the result. > > I've done measurements on the patched kernel. All that remains is to do > measurements on the baseline unpached case. To summarize the results > thusfar, > > Times: > ======= > user sys %cpu inputs outputs > Patched, drop 142 64 46 13557744 14052744 > Patched, nodrop 55 57 33 13557936 13556680 > > vmstat: > ======== > free_pages inact_anon act_anon inact_file act_file dirtied written reclaim > Patched, drop, pre 306043 37541 185463 276266 153955 3689674 3604959 1550641 > Patched, drop, post 13233 38462 175252 536346 178792 5527564 5371563 3169155 > > Patched, nodrop, pre 475211 38602 175242 81979 178820 5527592 5371554 3169155 > Patched, nodrop, post 7697 38959 176986 547984 180855 7324836 7132158 3169155 > > Altogether, it seems that something is horribly wrong, most likely with > my test (or rsync patch). I'll do the baseline benchmarks today. > > Thoughts? How do you test it? I think patch's effect would be good in big memory pressure environment. Quickly I did it on my desktop environment.(2G DRAM) So it's not completed result. I will test more when out of office. Used kernel : mmotm-12-02 + my patch series Used rsync : 1. rsync_normal : v3.0.7 vanilla 2. rsync_patch : v3.0.7 + Ben's patch(fadvise) Test scenario : * kernel full compile * git clone linux-kernel * rsync local host directory to local host dst directory 1) rsync_normal : 89.08user 127.48system 33:22.24elapsed 2) rsync_patch : 88.42user 135.26system 31:30.56elapsed 1) rsync_normal vmstat : pgfault : 45538203 pgmajfault : 4181 pgactivate 377416 pgdeactivate 34183 pginvalidate 0 pgreclaim 0 pgsteal_dma 0 pgsteal_normal 2144469 pgsteal_high 2884412 pgsteal_movable 0 pgscan_kswapd_dma 0 pgscan_kswapd_normal 2149739 pgscan_kswapd_high 2909140 pgscan_kswapd_movable 0 pgscan_direct_dma 0 pgscan_direct_normal 647 pgscan_direct_high 716 pgscan_direct_movable 0 pginodesteal 0 slabs_scanned 1737344 kswapd_steal 5028353 kswapd_inodesteal 438910 pageoutrun 81208 allocstall 9 pgrotated 1642 2) rsync_patch vmstat: pgfault : 47570231 pgmajfault : 2669 pgactivate 391806 pgdeactivate 36861 pginvalidate 1685065 pgreclaim 1685065 pgrefill_dma 0 pgrefill_normal 32025 pgrefill_high 9619 pgrefill_movable 0 pgsteal_dma 0 pgsteal_normal 744904 pgsteal_high 1079709 pgsteal_movable 0 pgscan_kswapd_dma 0 pgscan_kswapd_normal 745017 pgscan_kswapd_high 1096660 pgscan_kswapd_movable 0 pgscan_direct_dma 0 pgscan_direct_normal 0 pgscan_direct_high 0 pgscan_direct_movable 0 pginodesteal 0 slabs_scanned 1896960 kswapd_steal 1824613 kswapd_inodesteal 703499 pageoutrun 26828 allocstall 0 pgrotated 1681570 In summary, Unfortunately, the number of fault is increased (47570231 - 45538203) but pgmajfault is reduced (4181 - 2669). The number of scanning is much reduced. 2149739 -> 745017, 2909140 -> 1096660 and even no direct reclaim in patched rsync. The number of steal is much reduced. 2144469 -> 744904, 2884412 -> 1079709, 5028353 -> 1824613. The elapsed time is reduced 2 minutes. I think result is good. Reduced the steal number could imply prevent eviction of working set pages. It has a good result with small effort(small scanning). I will resend with more exact measurement after repeated test. > Thanks, > > - Ben > > -- Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href