Kernel preemption
mats.lindberg at se.transport.bombardier.com
mats.lindberg at se.transport.bombardier.com
Mon Feb 14 09:49:06 GMT 2005
Hello,
I'm interested in using freebsd in a 'not so realtime, but...' software
project.
In our running environment there are a 3 processes that need high
priority.
The processes never need much cpu but they should be able to respond to
network (tcp) activity within 10-20ms.
I have a testprogram in C that sends ~24kB tcp-messages via a switched
ethernet.
Sometimes there is a ~250ms delay in receiving (or sending). This could
happen after an hour or so.
I've tried building a 5.3 system with PREEMPTION and the 4BSD Scheduler.
It did not help.
I've tried building a 6.0 current system with PREEMPTION and the ULE
scheduler. It did not boot.
I've tried this on a linux preemptive kernel and it works fine.
Is the PREEMPTION option applicable for my problem?
Should PREEMPTION work for the 4BSD scheduler?
Mats
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