-----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of John R Pierce Sent: den 9 mars 2012 08:54 To: centos at centos.org Subject: Re: [CentOS] HT (Hyper Threading) on CentOS 5.5 On 03/08/12 11:44 PM, Sorin Srbu wrote: > I know there might be some negative performance issues with certain > applications, but would you notice it in day-to-day use? if you're using the server for pure floating point compute, don't run more threads than you have actual cores. high concurrency server workloads that aren't IO bound generally benefit quite a lot from using hyperthreads to double the number of active workers. the HT on the X5600 and such newer Xeons is quite a lot better than the old netburst/p4 architecture where the benefits were marginal in many cases. =================== Thanks. -- /Sorin