Re: Linux responsiveness under heavy load

[Rik van Riel <riel@conectiva.com.br>]

On Wed, 8 Mar 2000, Jamie Lokier wrote:

	[snip awful performance under load]
> A larger boost to keep-the-page-in-memory priority for pages
> referenced by "interactive" processes might be in order.  
> Either faster vmscanning simply a higher priority for pages
> found to be used.  Might not be too hard to implement either.

Indeed it shouldn't be. Having a two-phase NRU unmapping in the
page table scanning and a maybe better LRU reclamation in
shrink_mmap() may help here, but the CPU cost may put some
people off...

Then again, not having this better memory reclamation is probably
more expensive than having it :)

Now where did I put that asbestos underwear?

> A larger priority for page-in I/O due to interactive process too
> might help too.  Some modification of Andrea's elevator.  But
> that doesn't seem so easy.

Read requests are easily tied to a process, so this could
be relatively easy. Doing it properly before 2.5 may be a
little difficult though ...

regards,

Rik
--
The Internet is not a network of computers. It is a network
of people. That is its real strength.

http://www.conectiva.com/		http://www.surriel.com/

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