I'm seeing something similar. We've migrated from Intrepid to Lucid instances, load averages for processes that were very low load under Intrepid are causing very high load(real load the system becomes unresponsive), on Lucid. The load spike are seemingly random, with no correlation to other activity on the system, IO, etc. We did/do not see variation like this with Intrepid instances. These are m2.2xlarge instances.
I'm seeing something similar. We've migrated from Intrepid to Lucid instances, load averages for processes that were very low load under Intrepid are causing very high load(real load the system becomes unresponsive), on Lucid. The load spike are seemingly random, with no correlation to other activity on the system, IO, etc. We did/do not see variation like this with Intrepid instances. These are m2.2xlarge instances.