Messages in this thread |  | | Date | Fri, 28 Sep 2001 22:20:37 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: 2.4.9-ac16 good perfomer? |
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On Fri, 28 Sep 2001, Mike Fedyk wrote:
> Is it normal to have Inact_target 1/4 of main memory (64MB of 256MB RAM)? > In previous versions, this value would fluctuate with the load of the system. > > Is this expected?
Yes, this is a 'compensation' for the fact that page aging changed from exponential to linear. The combination of linear page aging with a large inactive_target results in a good combination of frequency- and recency-based page eviction.
Doing just linear page aging with a small inactive target resulted in worse throughput than exponential page aging for some workloads, better for other workloads. Linear page aging with a large inactive target results in good througput and latency under all workloads I've found up to now. As usual, thanks go out to Matt Dillon for finding this balancing point.
I guess it really is time to stop reinventing the wheel ;)
cheers,
Rik -- IA64: a worthy successor to i860.
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