How jvm threads works on new Linux 2.6 scheduler with SMP kernell

Hi,
i'm using Sun JDK Java HotSpot(TM) Server VM (build 1.5.0_14-b03, mixed mode) to run tomcat,
anyone knows How JVM threads works on new Linux 2.6 scheduler with SMP kernel?
i ask this, because in a single processor machine the tomcat replies more fast than a dual processor machine, maybe the reason is, that SMP load balancing made for new scheduler, slow down the JVM performance for threads? there is a way to avoid this?
reference about Linux Scheduler: http://www-128.ibm.com/developerworks/linux/library/l-scheduler/?ca=dgr-lnxw09LinuxScheduler
bug that have "same" problem: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5038858
thanks for any insight

This is bug:
6328462 Linux getCurrentThreadCpuTime() does not match with getThreadCpuTime(currentThread)
It will be fixed in:
- JDK 6.0 (Mustang) build b63
- JDK 1.5.0_07 build b01
The problem is that the HotSpot VM takes the stat info from the file'/proc/$tid/stat'
which is incorrect on Linux kernels 2.6+ with NPTL because this file aggregates
per-process (.vs. per-thread) usage on these kernels.
The file '/proc/self/task/$tid/stat' still has the per-thread usage and must be used instead.
There is also a performance bug:
6200022: JVMTI GetCurrentThreadCpuTime slow on Linux
This bug is about using new Linux posix compliant process clocks (2.6.10) :
http://sources.redhat.com/ml/libc-alpha/2004-10/msg00117.html
It is too late to fix this in Mustang but can be possible in one of the update releases.
Thank you for posting the question!
Serguei

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