Re: 2.4.9-ac16 good perfomer?

Rik van Riel (
Fri, 28 Sep 2001 22:20:37 -0300 (BRST)

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 ;)



IA64: a worthy successor to i860.

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