Hello, any 2.4.1-ac5 kernel and above until 2.4.2-ac3 had a bug (Ingo guessed it might be the yield() bug) that made Java (and some other things *really* slow). This is fixed now. When I profiled slow kernels the mtrr_file_add was taking up all of the time - even though I had disabled mtrr in my kernel (it wasn't in /proc). (Alan Cox: I'm not sure if the yield() bug was the problem, or if that patch was in the TUX patch (based on -ac3) or the -ac3 patch.) Here was the old test: (With 2.4.2-ac3 things are even faster than 2.2.14 at 0:00.44elapsed!!) (jdk1.3.0_01) > time java (done multiple times so everything is in cache) On 2.2.14 (400MHz Celeron/192MB RAM) this takes about 0.66ms. 0.37 user 0.07 system 0:00.62elapsed 70% CPU (oavgtext+0avgdata 0maxresident)k 0inputs+0outputs (3957major+1707minor)pagefulats 0swaps On linux 2.4.2-ac1-TUX (same machine) 0.33 user 2.17 system 0:03.49elapsed 71%CPU (ovgtext+0avgdata 0maxresident)k 0inputs+0outputs (3987major+1784minor)pagefaults 0swaps __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
