Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches)

[Kris Kennaway]

On Wed, May 25, 2005 at 05:45:29AM +0200, Matthias Buelow wrote:
> Kris Kennaway wrote:
> 
> >OK, thanks for confirming.  The next step is for you to try 6.0 with
> >debug.mpsafevfs=1 on a machine that exhibits the problem under 5.4, so
> >we can test whether the problem is caused by VFS being under Giant on
> >5.4.
> 
> I have now built 6.0-current from yesterday's source, verified that 
> debug.mpsafevfs=1, and unpacked the firefox source.
> Unfortunately your hypothesis didn't hold.  In fact, it's a lot worse 
> than on 5.4-STABLE.  Plus, even operations like bulk-rm'ing the unpacked 
> firefox tree make X11 crawl and stutter, something that didn't have any 
> observable effect on 5.4-STABLE.  Maybe the dmesg output is of some help:
> 
> 
> Copyright (c) 1992-2005 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> 	The Regents of the University of California. All rights reserved.
> FreeBSD 6.0-CURRENT #0: Wed May 25 05:00:48 CEST 2005
>     root at drjekyll.mkbuelow.net:/usr/obj/usr/src/sys/GENERIC
> WARNING: WITNESS option enabled, expect reduced performance.

*Ahem*

Kris
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