Issue #2288 has been updated by tuxillo. Priority changed from Low to Normal
Jan, Do you think we can have this checked again? Didn't you run this tests automatically? Cheers, Antonio Huete ---------------------------------------- Bug #2288: Random IO performance loss introduced since January 1st http://bugs.dragonflybsd.org/issues/2288 Author: lentferj Status: Feedback Priority: Normal Assignee: Category: Target version: Running pgbench I found that performance had dropped by 13%. To figure out the reason I did some sysbench io tests (see below). All tests were run using the same test files, same hardware etc etc 3 times in a row. As the results were consistent I am only pasting the result of the last run of each set. The cause for the performance loss must have been introduced some time between Jan 1st and Jan 23rd. 2.12: atom# sysbench --test=fileio --file-num=8 --file-total-size=6G --file-test-mode=rndrd --max-requests=0 --max-time=300 run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 1 Extra file open flags: 0 8 files, 768Mb each 6Gb total file size Block size 16Kb Number of random requests for random IO: 0 Read/Write ratio for combined random IO test: 1.50 Periodic FSYNC enabled, calling fsync() each 100 requests. Calling fsync() at the end of test, Enabled. Using synchronous I/O mode Doing random read test Threads started! Time limit exceeded, exiting... Done. Operations performed: 50389 Read, 0 Write, 0 Other = 50389 Total Read 787.33Mb Written 0b Total transferred 787.33Mb (2.6244Mb/sec) 167.96 Requests/sec executed Test execution summary: total time: 300.0027s total number of events: 50389 total time taken by event execution: 299.7273 per-request statistics: min: 0.02ms avg: 5.95ms max: 77.80ms approx. 95 percentile: 12.05ms Threads fairness: events (avg/stddev): 50389.0000/0.00 execution time (avg/stddev): 299.7273/0.00 2.13 g47f97 (new year's eve): atom# sysbench --test=fileio --file-num=8 --file-total-size=6G --file-test-mode=rndrd --max-requests=0 --max-time=300 run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 1 Extra file open flags: 0 8 files, 768Mb each 6Gb total file size Block size 16Kb Number of random requests for random IO: 0 Read/Write ratio for combined random IO test: 1.50 Periodic FSYNC enabled, calling fsync() each 100 requests. Calling fsync() at the end of test, Enabled. Using synchronous I/O mode Doing random read test Threads started! Time limit exceeded, exiting... Done. Operations performed: 50037 Read, 0 Write, 0 Other = 50037 Total Read 781.83Mb Written 0b Total transferred 781.83Mb (2.6061Mb/sec) 166.79 Requests/sec executed Test execution summary: total time: 300.0040s total number of events: 50037 total time taken by event execution: 299.7070 per-request statistics: min: 0.02ms avg: 5.99ms max: 104.73ms approx. 95 percentile: 12.06ms Threads fairness: events (avg/stddev): 50037.0000/0.00 execution time (avg/stddev): 299.7070/0.00 2.13 (from Jan 23rd incl. the sili/ahci fix): atom# sysbench --test=fileio --file-num=8 --file-total-size=6G --file-test-mode=rndrd --max-requests=0 --max-time=300 run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 1 Extra file open flags: 0 8 files, 768Mb each 6Gb total file size Block size 16Kb Number of random requests for random IO: 0 Read/Write ratio for combined random IO test: 1.50 Periodic FSYNC enabled, calling fsync() each 100 requests. Calling fsync() at the end of test, Enabled. Using synchronous I/O mode Doing random read test Threads started! Time limit exceeded, exiting... Done. Operations performed: 39898 Read, 0 Write, 0 Other = 39898 Total Read 623.41Mb Written 0b Total transferred 623.41Mb (2.078Mb/sec) 132.99 Requests/sec executed Test execution summary: total time: 300.0038s total number of events: 39898 total time taken by event execution: 299.7377 per-request statistics: min: 0.02ms avg: 7.51ms max: 61.00ms approx. 95 percentile: 12.27ms Threads fairness: events (avg/stddev): 39898.0000/0.00 execution time (avg/stddev): 299.7377/0.00 -- You have received this notification because you have either subscribed to it, or are involved in it. To change your notification preferences, please click here: http://bugs.dragonflybsd.org/my/account
