Do you mean 6-12% of total iowait, or per cpu? Our average iowait in the last week is 34.31% of a total 1600% with an average idle of 1451.76%. Our iowait *does* spike occasionally (today it went up to 148.01%) but it doesn't coincide with the lock happening. At the time of the lock we were at 10.58% iowait, which is quite a bit below our average.
Thanks,
-Chris.
On Wed, Feb 1, 2012 at 4:55 PM, Alan Hodgson <ahodgson@simkin.ca> wrote:
Define "low I/O". The only things I've ever seen interfere with console access are running out of memory or excessive disk i/o. If you're seeing even 6-12% iowait on a 16 core machine you might very well have swamped your available disk I/O.