Re: why swap at all?

[Bernd Eckenfels]

In article <200405290037.17775.vda@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> you wrote:
>> The benchmark involved was ls.  It took several seconds.  If I ran it again
>> in 5 seconds or so, it was fine.  Much longer and it would take several
>> seconds again.  Sounds like pages getting evicted in LRU order.
> 
> By what magic system can know that you are going to do ls again
> in 2 minutes?

The problem is more about the blocks cp touches, less  about predicting the ls workload.

> cp should use fadvise() and say that it _really_ does not need those pages.

Yes, indeed. On the other hand the sequential read could be detected by the kernel, too.

Greetings
Bernd
-- 
eckes privat - http://www.eckes.org/
Project Freefire - http://www.freefire.org/
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