Re: pre2 swap_out() changes

[Marcelo Tosatti <marcelo@conectiva.com.br>]

On Sun, 14 Jan 2001, Ed Tomlinson wrote:

> Hi,
> 
> A couple of observations on the pre2/pre3 vm.  It seems to start swapping out 
> very quicky but this does not seem to hurt.  Once there is memory preasure 
> and swapin starts cpu utilization drops thru the roof - kernel compiles are 
> only able to drive the system at 10-20% (UP instead of 95-100%).  Once the 
> system stops swapping (in) there are some side effects.  Closing windows 
> in X becomes jerky (ie you see blocks get cleared and refreshed).  If little 
> or no swapping has occured X is much faster.
> 
> With the patch marcelo posted last night things change.  Now It can use cpu 
> when swapping.  It does seem to start swaping (in and out) faster but the 
> system remains more interactive than above.  I still see the X effect though.
> 
> Over all I think 2.4.0+marcelo's first patch(es) was fastest.

There is still a critical thing to be fixed which is the swapout selection
path (which is probably what is causing your problem in X)

Anyway, thanks for the report.

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