Hi Eivind, FYI, we noticed the below changes on git://neil.brown.name/md for-next commit cf170f3fa451350e431314e1a0a52014fda4b2d6 ("raid5: avoid release list until last reference of the stripe") test case: lkp-st02/dd-write/11HDD-RAID5-cfq-xfs-10dd 8b32bf5e37328c0 cf170f3fa451350e431314e1a --------------- ------------------------- 486996 ~ 0% +4.8% 510428 ~ 0% TOTAL vmstat.io.bo 17643 ~ 1% -17.3% 14599 ~ 0% TOTAL vmstat.system.in 11633 ~ 4% -56.7% 5039 ~ 0% TOTAL vmstat.system.cs 109 ~ 1% +6.5% 116 ~ 1% TOTAL iostat.sdb.rrqm/s 109 ~ 2% +5.1% 114 ~ 1% TOTAL iostat.sdc.rrqm/s 110 ~ 2% +5.5% 117 ~ 0% TOTAL iostat.sdj.rrqm/s 12077 ~ 0% +4.8% 12660 ~ 0% TOTAL iostat.sde.wrqm/s 48775 ~ 0% +4.8% 51125 ~ 0% TOTAL iostat.sde.wkB/s 12077 ~ 0% +4.8% 12659 ~ 0% TOTAL iostat.sdb.wrqm/s 12076 ~ 0% +4.8% 12659 ~ 0% TOTAL iostat.sdd.wrqm/s 12077 ~ 0% +4.8% 12660 ~ 0% TOTAL iostat.sdf.wrqm/s 48775 ~ 0% +4.8% 51121 ~ 0% TOTAL iostat.sdb.wkB/s 12078 ~ 0% +4.8% 12659 ~ 0% TOTAL iostat.sdj.wrqm/s 12078 ~ 0% +4.8% 12660 ~ 0% TOTAL iostat.sdi.wrqm/s 12076 ~ 0% +4.8% 12658 ~ 0% TOTAL iostat.sdg.wrqm/s 48774 ~ 0% +4.8% 51122 ~ 0% TOTAL iostat.sdd.wkB/s 48776 ~ 0% +4.8% 51128 ~ 0% TOTAL iostat.sdf.wkB/s 48780 ~ 0% +4.8% 51121 ~ 0% TOTAL iostat.sdj.wkB/s 48779 ~ 0% +4.8% 51128 ~ 0% TOTAL iostat.sdi.wkB/s 48773 ~ 0% +4.8% 51119 ~ 0% TOTAL iostat.sdg.wkB/s 486971 ~ 0% +4.8% 510409 ~ 0% TOTAL iostat.md0.wkB/s 12076 ~ 0% +4.8% 12657 ~ 0% TOTAL iostat.sdc.wrqm/s 12077 ~ 0% +4.8% 12659 ~ 0% TOTAL iostat.sdh.wrqm/s 1910 ~ 0% +4.8% 2001 ~ 0% TOTAL iostat.md0.w/s 110 ~ 2% +6.5% 117 ~ 1% TOTAL iostat.sdk.rrqm/s 12077 ~ 0% +4.8% 12659 ~ 0% TOTAL iostat.sdk.wrqm/s 48772 ~ 0% +4.8% 51115 ~ 0% TOTAL iostat.sdc.wkB/s 48776 ~ 0% +4.8% 51121 ~ 0% TOTAL iostat.sdh.wkB/s 48777 ~ 0% +4.8% 51121 ~ 0% TOTAL iostat.sdk.wkB/s 109 ~ 2% +3.3% 113 ~ 1% TOTAL iostat.sde.rrqm/s 4.28e+09 ~ 0% -4.1% 4.104e+09 ~ 0% TOTAL perf-stat.cache-misses 8.654e+10 ~ 0% +4.7% 9.058e+10 ~ 0% TOTAL perf-stat.L1-dcache-store-misses 3.549e+09 ~ 1% +3.7% 3.682e+09 ~ 0% TOTAL perf-stat.L1-dcache-prefetches 6.764e+11 ~ 0% +3.7% 7.011e+11 ~ 0% TOTAL perf-stat.dTLB-stores 6.759e+11 ~ 0% +3.7% 7.011e+11 ~ 0% TOTAL perf-stat.L1-dcache-stores 4.731e+10 ~ 0% +3.6% 4.903e+10 ~ 0% TOTAL perf-stat.L1-dcache-load-misses 3.017e+12 ~ 0% +3.5% 3.121e+12 ~ 0% TOTAL perf-stat.instructions 1.118e+12 ~ 0% +3.3% 1.156e+12 ~ 0% TOTAL perf-stat.dTLB-loads 1.117e+12 ~ 0% +3.2% 1.152e+12 ~ 0% TOTAL perf-stat.L1-dcache-loads 3.022e+12 ~ 0% +3.2% 3.119e+12 ~ 0% TOTAL perf-stat.iTLB-loads 5.613e+11 ~ 0% +3.2% 5.794e+11 ~ 0% TOTAL perf-stat.branch-instructions 5.62e+11 ~ 0% +3.1% 5.793e+11 ~ 0% TOTAL perf-stat.branch-loads 1.343e+09 ~ 0% +2.6% 1.378e+09 ~ 0% TOTAL perf-stat.LLC-store-misses 2.073e+10 ~ 0% +2.9% 2.133e+10 ~ 1% TOTAL perf-stat.LLC-loads 4.854e+10 ~ 0% +1.6% 4.931e+10 ~ 0% TOTAL perf-stat.cache-references 1.167e+10 ~ 0% +1.4% 1.183e+10 ~ 0% TOTAL perf-stat.L1-icache-load-misses 7068624 ~ 4% -56.4% 3078966 ~ 0% TOTAL perf-stat.context-switches 2.214e+09 ~ 1% -7.8% 2.041e+09 ~ 1% TOTAL perf-stat.LLC-load-misses 131433 ~ 0% -18.9% 106597 ~ 1% TOTAL perf-stat.cpu-migrations Legend: ~XX% - stddev percent [+-]XX% - change percent Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. Thanks, Jet