On Tuesday 22 Jul 2008, Balu manyam wrote:
anyone?
On Tue, Jul 22, 2008 at 12:27 AM, Balu manyam <balu.manyam@xxxxxxxxx>wrote:
hey gurus -- i have a HP server with 4*dual core AMD opteron
processors running 2.6.9-42 SMP kernel -- one of my DBAs
complained of poor performance while running an SQL query -- now
when I check the 'mpstat -P ALL 5 ' o/p - I see that CPU 0 is
completely busy (idle 0%) most of the time -- while the other CPUs
are close to 99% idle -- I did a cat /proc/interrupts I see that
CPU0 is indeed having high values corresponding to ethernet devices
, other PCI devices , RAID controller and the timer as well --- I
also checked that we are running irqbalance daemon and please note
that we are running the kernel with noapic option -- not sure if
that matters at all
any inputs you may render are higlhly appreciated