Greeting, FYI, we noticed a -10.0% regression of blogbench.read_score due to commit: commit: 5c279bd9e40624f4ab6e688671026d6005b066fa ("scsi: default to scsi-mq") https://git.kernel.org/cgit/linux/kernel/git/jejb/scsi.git misc in testcase: blogbench on test machine: 16 threads Intel(R) Xeon(R) CPU D-1541 @ 2.10GHz with 8G memory with following parameters: disk: 1SSD fs: ext4 cpufreq_governor: performance test-description: Blogbench is a portable filesystem benchmark that tries to reproduce the load of a real-world busy file server. test-url: https://www.pureftpd.org/project/blogbench Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone https://github.com/01org/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml testcase/path_params/tbox_group/run: blogbench/1SSD-ext4-performance/lkp-bdw-de1 6d311fa7d2c18659 5c279bd9e40624f4ab6e688671 ---------------- -------------------------- %stddev change %stddev \ | \ 292048 -10% 262860 blogbench.read_score 6628 ± 4% 50% 9913 ± 4% blogbench.write_score 104681 319% 439016 blogbench.time.involuntary_context_switches 1.178e+08 -27% 86266452 blogbench.time.file_system_inputs 3112606 -8% 2877831 blogbench.time.voluntary_context_switches 209 214 blogbench.time.percent_of_cpu_this_job_got 603 620 blogbench.time.system_time 80955370 37% 1.11e+08 blogbench.time.file_system_outputs 193975 -27% 141449 vmstat.io.bi 152861 35% 205958 vmstat.io.bo 24997 124% 56094 vmstat.system.cs 33317 7% 35633 vmstat.system.in 428.54 ± 10% -30% 300.32 ± 8% iostat.sda.rrqm/s 9670 -28% 6988 iostat.sda.r/s 193974 -27% 141449 iostat.sda.rkB/s 172120 31% 225064 iostat.sda.wkB/s 8583.63 4% 8896.15 iostat.sda.wrqm/s 6074 77% 10748 iostat.sda.w/s 7593732 125% 17107441 perf-stat.context-switches 21914349 ± 3% 24% 27154223 ± 4% perf-stat.dTLB-store-misses 3.952e+11 8% 4.27e+11 perf-stat.dTLB-loads 2.524e+11 7% 2.701e+11 perf-stat.branch-instructions 4.634e+10 6% 4.892e+10 perf-stat.cache-references 1.468e+09 11% 1.627e+09 perf-stat.branch-misses 4.634e+10 6% 4.892e+10 perf-stat.cache-misses 1.314e+12 8% 1.425e+12 perf-stat.instructions 2.289e+08 25% 2.86e+08 ± 4% perf-stat.iTLB-loads 2.279e+08 15% 2.632e+08 ± 3% perf-stat.dTLB-load-misses 0.06 7% 0.06 perf-stat.dTLB-load-miss-rate% 0.59 10% 0.65 perf-stat.ipc 0.01 ± 3% 13% 0.01 ± 4% perf-stat.dTLB-store-miss-rate% 2.291e+11 9% 2.503e+11 perf-stat.dTLB-stores 0.58 4% 0.60 perf-stat.branch-miss-rate% 285094 22% 346640 perf-stat.cpu-migrations blogbench.write_score 12000 ++------------------------------------------------------------------+ | | 11000 ++ O | | O O O O O O O O | O OO O O | 10000 ++ O O O O O O O O O O | |O O O O O O OO | 9000 ++ | | O | 8000 ++ | | | | | 7000 ** ***.* **** * ***.*** *** * .*** * * **. ** ** | * * ****.* ***** * ** * ***** *.**** *** * ::| 6000 ++----------------------------------------------------------------*-+ [*] bisect-good sample [O] bisect-bad sample 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, Xiaolong