Although the HZ did drop from 250 to 100 in karmic to lucid update PREEMPT has always been off in both cases, so if CONFIG_HZ=250 is not sufficient there are other issues.
Although the HZ did drop from 250 to 100 in karmic to lucid update PREEMPT has always been off in both cases, so if CONFIG_HZ=250 is not sufficient there are other issues.