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

Max Laier max at
Tue May 24 12:41:41 PDT 2005

On Monday 23 May 2005 23:21, Matthias Buelow wrote:
> Kris Kennaway wrote:
> > One thing that probably confuses and misleads a lot of people is when
> > they build world or a kernel and notice that it's taking much longer
> > than it did under 4.x, so they assume this means that 5.x is slower
> > than 4.x.  It doesn't.  What it means is that 5.x and 4.x have
> > different C compilers, and gcc 3.x is much slower at compiling code
> > than gcc 2.x.  You have to be very careful to draw conclusions based
> > on subjective assessments like this.
> Another thing might be that interactive response time seems to be worse.
>  While I (or rather ports) unpack the firefox/thunderbird source, the
> machine is pretty much bogged down (mouse cursor jumps around, audio
> stutters...).  Haven't seen that on FreeBSD since the 386 days.

I have seen this on my box.  Disabling one of the USB-ports solved the 
problem.  I was seeing very high IRQ-rates.  Check $vmstat -i during the 
process to see if you have abnormal high rate jumps.  It might be that we 
must investigate some of our drivers to play nice with each other.

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