On 30 January 2011 20:03, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote: > Mathias BurÃn put forth on 1/30/2011 1:41 PM: > >> Thanks. New results up for those interested: >> http://stuff.dyndns.org/logs/bonnie_results.html > > Three things I notice: > > 1. ÂYou're CPU bound across the board, for all the tests that matter anyway > 2. ÂBecause of this, your performance spread is less than 5% across the board > Â Âmeaning any optimizations are useless > 3. ÂIs that a 7 Gigabyte chunk size? ÂThat's totally unrealistic. ÂIt should be > Â Âless than 1 MB for almost all workloads. > > According to those numbers, you can swap SATA controllers and PCIe bus slot > assignments all day long, but you'll gain nothing without a faster CPU. > > Why are you using a 7 Gigabyte chunk size? ÂAnd if the other OP was correct > about the 768MB stripe cache, that's totally unrealistic as well. ÂAnd in real > world use, you don't want a high readahead setting. ÂIt just wastes buffer cache > memory for no gain (except maybe in some synthetic benchmarks). > > -- > Stan > CPU bound, got it. 3) 7GB output from bonnie++. Like so: $ time bonnie++ -m ion -d ./ Writing with putc()...done Writing intelligently...done Rewriting...done Reading with getc()...done Reading intelligently...done start 'em...done...done...done... Create files in sequential order...done. Stat files in sequential order...done. Delete files in sequential order...done. Create files in random order...done. Stat files in random order...done. Delete files in random order...done. Version 1.03e ------Sequential Output------ --Sequential Input- --Random- -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 ion 7G 13455 96 150827 92 67719 43 14439 99 271832 59 469.6 3 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 20318 99 +++++ +++ 25428 99 21095 99 +++++ +++ 25278 99 ion,7G,13455,96,150827,92,67719,43,14439,99,271832,59,469.6,3,16,20318,99,+++++,+++,25428,99,21095,99,+++++,+++,25278,99 real 21m7.872s user 16m17.836s sys 2m51.405s (after ion) // Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
