swap performance under 6.1

Kris Kennaway kris at obsecurity.org
Wed Apr 12 04:03:27 UTC 2006

On Tue, Apr 11, 2006 at 10:43:32PM +0000, David E. Cross wrote:
> I saw under http://www.freebsd.org/releases/6.1R/todo.html  that swap
> performance under 6.x is slower then 4.X, and this is listed as "not
> done".
> I noticed that 6.1 seemed to be a dog, but 6.0 I thought was better.  As
> a test I installed 6.0 and 6.1 in parallel on my laptop with identical
> ports trees (and packages) and 6.0 does feel a lot more responisve to
> swapping; I would be eager to help track this down if someone could give
> me some pointers.  If I have to _guess_ as to a problem it would seem
> like some of the scheduling priorities changed.  (this is with GENERIC
> under 6.0 and 6.1, this is with 6.1-PRERELEASE from April 5; I can CVSUP
> to the latest if people think things have changed.)

I didn't think this was a 6.1 regression compared to 6.0, but 6.x
compared to 4.x.  It would be good to try and quantify any performance
differences here - so far it's just a bunch of people's subjective
opinions (including mine) after upgrading from 4.x.

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