Re: [PATCH 2/5] writeback: dirty position control

Peter Zijlstra
2011-08-26T12:12:16Z

On Fri, 2011-08-26 at 19:26 +0800, Wu Fengguang wrote:
> Now I get 3 figures. Test case is: run 1 dd write task for 300s, with
> a "disturber" dd read task during roughly 120-130s.

Ah, but ideally the disturber task should run in bursts of 100ms
(<feedback period), otherwise your N is indeed mostly constant.