Hi,

Please note that Moshe is (usually) very pro Linux (read his earlier columns).
I guess that he had expected Linux 2.4 to really beat FreeBSD - it did not...

/RogerL 

On Wednesday 07 February 2001 01:25, Jean Francois Martinez wrote:

Moshe Barr is claiming on Byte that sendmail and mysql are 30% faster on
FreeBSD than Linux 2.4.   Now given that I don't think that mysql is
spending 30% of its time in kernel mode there are not many ways FreeBSD can
be 30% faster.

1) Compiler issues.  Moshe Barr does not tell what distrib ha was using so
we don't know what distribution was used and with what

2) Driver problems, specally those related to enabling UltraDma since
without UltraDMA most disks are both very slow and CPU hogs.

3) Options not enabled.  This a 2.2 Linux distrib with a 2.4 keernel
plastered on it and thus software has not been compiled to take advantage
of 2.4bfeatures and the boot sequence does not do a good job of tuning the
kernel through sysctl

4) Memory management.  If FreeBSD is smarter than Linux about which page to
thow out it will be _much_ faster when memory is tight.


Now what about a Mindcraft-style reaction?  Check what was wrong in the
test protocol, write an answer if it was due to the test and in case it was
not the test but a perfomance bottleneck fix it.

Moshe (and a few other people will do the same) was wondering why to stay
with Linux so better fix the problems if we want Linux and not BSD reaching
world domination.


									JF
Martinez
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