At 01:59 -0500 12/7/11, Stan Hoeppner wrote:
On 7/12/2011 1:12 AM, Rainer Frey wrote:
On 11.07.2011, at 17:03, Stan Hoeppner wrote:
The R410 is a two socket Xeon box with max 2 x 6 core CPUs. The 24 CPUs
you see is the result of HyperThreading being enabled. I'd disable HT
if I were you, or those boxen mine.
Why?
It's a troubleshooting step. HT can cause weird problems with some
systems/kernels. It can also decrease performance with some workloads.
As with anything, if it doesn't provide benefit, turn if off to reduce
complexity and potential problems.
Or, another way, HT only helps when having twice as many (apparent)
processors running at half the (effective) speed is good for your
specific workload. Just because it's a band-waggon it doesn't mean
you have to jump onto it.
David
--
David Ledger - Freelance Unix Sysadmin in the UK.
HP-UX specialist of hpUG technical user group (www.hpug.org.uk)
david.led...@ivdcs.co.uk
www.ivdcs.co.uk
