2.1.91 swap performance: jerky.

mlord (mlord@pobox.com)
Thu, 26 Mar 1998 23:20:39 -0500


I run a P2-266 w/64MB SDRAM.

To try out the swapping of 2.1.91,
I just fire up four copies of xboard (gnu chess),
and tell each one to play with "two machines".

That gets the swapping going fairly fast and furious,
but it eventually stabilizes. Then I start up some
applications like netscape, wordperfect..

What I observe is rather strange, using 'top' to watch things:

the "cached" value suddenly starts getting bigger,
as the system nearly halts while dumping stuff en masse
to the swap partition.

"cached" climbs to about 32MB of my 64MB total SDRAM,
and then a flurry of reverse activity kicks in..
the "cached" value drops again, as pages are read back
in and response returns to the previously comatose system.

"cached" levels off again around 2-5MB, until I start some
new big application, whence the whole scenario repeats.

VERY jerky behaviour.

-- 
mlord@pobox.com
The Linux IDE guy

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