Re: performance loss on real time linux

[Michael Ströder <michael@stroeder.com>]

Pierangelo Masarati wrote:
> run a simple test using OpenLDAP 2.3.28 running on Linux 2.6.17 with
> RTAI, compared to the stock 2.3.6.15 kernel f the distribution
                              ^^^^^^^^
Do you mean stock 2.6.15?

> - searching for the same entry, after it's in cache, requires ~0.008s w/
> RTAI, and ~0.080s w/o RTAI (ten times longer!  It's a slightly different
> kernel, but running on exactly the same machine, [..]

Are you sure there haven't been any significant changes to the scheduler
between these two kernel versions anyway? Also distributions most times
ship with a patched kernel. So exact comparison should be done with a
vanilla kernel and the very same kernel with RTAI.

Ciao, Michael.