I've seen a similar problem that took several weeks to identify. There is an issue with transparent hugepage support (aka memory defrag) where it causes processes on a server to stall and a number of other weird symptoms, I actually suspected dodgy drivers for one of my raid controllers before I found the cause.
The solution (in my case) was to disable this facility: echo no > /sys/kernel/mm/redhat_transparent_hugepage/khugepaged/defrag echo never >/sys/kernel/mm/redhat_transparent_hugepage/defrag It's worth noting that this setting appears to be disabled by default on RHEL6 installations, but enabled on Centos 6. Cheers Jason. On Wed, May 9, 2012 at 10:15 AM, Michael Fox <[email protected]> wrote: > In which case, enable sysstat on centos if it's not already. will help > moving forward.. > > On Wed, May 9, 2012 at 10:11 AM, Grant Street <[email protected]> wrote: > > > 16 core, 12-24G memory running centos 6.1 > > > > > > On 09/05/12 10:08, David Lyon wrote: > > > >> Are they dual core ? > >> > >> Do they have a sheetload of memory ? > >> > >> I found ubuntu got slower and slower till I got in > >> newer hardware. > >> > > > > -- > > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > > Subscription info and FAQs: http://slug.org.au/faq/**mailinglists.html< > http://slug.org.au/faq/mailinglists.html> > > > -- > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html > -- -- Teach your kids Science, or somebody else will :/ [email protected] [email protected] <[email protected]> callsign: vk2vjb -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
