Subject: Re: mfs changes [thorpej@netbsd.org: CVS commit: syssrc]
To: Simon Burge <simonb@netbsd.org>
From: Jason R Thorpe <thorpej@zembu.com>
List: tech-kern
Date: 05/22/2000 18:38:16
On Tue, May 23, 2000 at 11:22:52AM +1000, Simon Burge wrote:
> Interesting how if anything there's a slight decrease in performance.
> The full CPU utilitisation is obviously because there's no context
> switch overhead at all... I hand edited the "100." bits - bonnie didn't
> cater for "100.0" in the %CPU columns :-)
That's not entirely surprising -- the "new" mfs (which is backed out) incurs
more TLB flush overhead, especially on systems that implement address space
identifiers (like the Alpha 21164 and higher, and MIPS); on such systems,
there is no TLB flushing on context switch because of the address space ID.
--
-- Jason R. Thorpe <thorpej@zembu.com>