With most of ftrace enabled, bonnie++ shows we have SSD I/O performance regression. Sequential read speed from 131K/Sec down to 102K/Sec
-- Kernel version, 3.13.0-17.27 with ftrace enable ubuntu@ubuntu:~$ bonnie++ -f -n 0 Writing intelligently...done Rewriting...done Reading intelligently...done start 'em...done...done...done...done...done... Version 1.97 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP ubuntu 13G 102888 81 63130 55 244493 85 8985 374 Latency 759ms 662ms 5933us 7319us 1.97,1.97,ubuntu,1,1415025240,13G,,,,102888,81,63130,55,,,244493,85,8985,374,,,,,,,,,,,,,,,,,,,759ms,662ms,,5933us,7319us,,,,,, -- Kernel version, 3.13.0-17.27 ubuntu@ubuntu:~$ bonnie++ -f -n 0 Writing intelligently...done Rewriting...done Reading intelligently...done start 'em...done...done...done...done...done... Version 1.97 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP ubuntu 13G 131511 97 74773 64 247270 84 8543 373 Latency 103ms 102ms 6456us 7237us ** Patch added: "0001-UBUNTU-Config-Enable-CONFIG_FTRACE.patch" https://bugs.launchpad.net/ubuntu/+source/linux-keystone/+bug/1386326/+attachment/4252067/+files/0001-UBUNTU-Config-Enable-CONFIG_FTRACE.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1386326 Title: Support ftrace in the linux-keystone kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-keystone/+bug/1386326/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
