Linux Jboss and java 1.6 core usage problem

[Boerbokrib]

Hi

we have a 64 core system with hyperthreading enabled system. IE 4 proc 8 core system with 231 gigs of ram. This is connected to an EVA enterprise storage.

model name      : Intel(R) Xeon(R) CPU           X7560  @ 2.27GHz
stepping        : 6
cpu MHz         : 1064.000
cache size      : 24576 KB

we have got linux 5.6 redhat enterprise with Jboss 4.2 which is application bound so we cannot upgrade to latest jboss.

we are on jdk1.6.0_27.

What we are seeing is that for periods of time one of the cores goes to 100 percent and all other (63) cores are not ustilised.Or lightly utilised. as per the attachment. The users are complaining of slowness.

We have 4 gig network trunck (bonding) on the system.

strace shows me the following errors.

stat("/jdk1.6.0_27/jre/lib/xerces.properties", 0x5f644a00) = -1 ENOENT (No such file or directory)

16775 --- SIGSEGV (Segmentation fault) @ 0 (0) ---

27799 <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)

27513 futex(0x59a623b4, FUTEX_WAIT_PRIVATE, 1, {0, 49939000}) = -1 ETIMEDOUT (Connection timed out)

27513 futex(0x59a623b4, FUTEX_WAIT_PRIVATE, 1, {0, 49946000}) = -1 ETIMEDOUT (Connection timed out)

27788 <... futex resumed> )             = -1 ETIMEDOUT (Connection timed out)

27513 <... futex resumed> )             = -1 ETIMEDOUT (Connection timed out)

The application guys are saying that it is an OS/hardware issue.. all monitoring shows no bottle necks in hardware.

What can i look at in the os side?