5.4-prerelease - hanging under load

Christian Brueffer chris at unixpages.org
Sun Apr 3 14:18:33 PDT 2005

On Sun, Apr 03, 2005 at 07:02:16PM +0200, Matthias Buelow wrote:
> Emanuel Strobl wrote:
> >Huh? I thought by default it is "HIGH", but it would also explain the 
> >experiences in the thread "cpufreq related RELENG_5 regression" 
> >(http://www.freebsd.org/cgi/getmsg.cgi?fetch=389949+393881+/usr/local/www/db/text/2005/freebsd-stable/20050327.freebsd-stable)
> But does that also affect desktop machines?  I'm not under the
> impression that my CPU is running at a lower frequency.  The issue
> I mentioned only seems to occur when doing larger block reads/writes
> from/to disk (SATA), like untarring firefox.  I didn't notice it
> so far when some kind of mixed disk access is going on, like with
> find, compiling, etc.  Maybe that points to some locking issues in
> the VM corner?  I mean, it's not dramatic, but still makes the
> system appear a bit unpolished, when it happens.  In the past, with
> pre-5.x releases, FreeBSD has been scheduling disk i/o and interactive
> work smoothly, in my experience, so one didn't quite notice when
> heavy disk access was going on, at least not if your interactive
> programs weren't doing much disk i/o themselves.

Not sure about desktop machines, probably depends on what exactly you're
doing.  At least it affects real-world scenarios, see my original message
to this list:


- Christian

Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
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