On Sat, 20 Apr 2002, Jay G Phelps wrote: > Despite the poorly written article, I have actually been somewhat > disappointed by the test results I have been getting on my MP3000 P30 Linux > system(s). In particular, the Bonnie++ test I did last week showed poor > results in most area's. Granted, I am running under VM in an LPAR, but I > still expected better results for I/O related work. > > On the other hand, running Tomcat and a Java/JSP based web site provided > reasonable performance so I am not ready to give up yet ;-) > > Would anyone running Linux on mainframe with channel attached DASD be > willing to do a Bonnie++ test and post the results? > I have several times read Linus on the subject of benchmarks like Bonnie and dbench. They are designed to torture the environment and almost never reflect actual workload. With them, some corner case bugs are detected and solved, but performance related problems based on those types of tests are almost always discounted by top developers.
I haven't seen definitive Linux/390 test results. There have certainly been enough published examples of problems that I would want to do serious performance test of any proposed workload before going ahead. One recent case involved slow DASD performance, but the DASD performance was limited independent of Linux... the DASD was emulated through some OS/2 subsystem. Linux is never going to give you better performance then the base system. john alvord
