Re: [PATCH] x86: Reduce the default HZ value

[Peter Zijlstra]

On Thu, 2009-05-07 at 13:20 -0400, Christoph Lameter wrote:
> On Thu, 7 May 2009, Peter Zijlstra wrote:
> 
> > Another user is RCU, the grace period is tick driven, growing these
> > ticks by a factor 50 or so might require some tinkering with forced
> > grace periods when we notice our batch queues getting too long.
> 
> One could also schedule RCU via hrtimers with a large fuzz period?

No, that's not the point, the longer these period are, the more
callbacks you can accumulate in a period. You need a cap on the callback
list, we already have seen DoS scenarios in this space.



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