A few questions

[Marcus Völp]

In addition, I am seeking well-commented, easy easy to understand scheduling
algorithms or detailed descriptions of them....

Fine explanations can be found at W. Stallings Operating Systems, Tanenbaum
Operating Systems, Gary Nutt Operating Systems. Scan the OSDI / SOSP papers
for newer stuff (check the authors site if access is restricted).

-----Original Message-----
From:	owner-l4-hackers at os.inf.tu-dresden.de
[mailto:owner-l4-hackers at os.inf.tu-dresden.de] On Behalf Of Geoff Humphreys
Sent:	Mittwoch, 20. Oktober 1999 13:41
To:	l4-hackers at os.inf.tu-dresden.de
Subject:	A few questions

Hello.  I have been writing my own microkernel using ideas from L4 and other
kernels.

I am curious as to whether or not there would be an appreciable performance
increase if the L4 system calls were split up into multiple calls.  For
example, the IPC call is be used to send messages, recieve messages, and to
do RPC.  Wouldn't it be faster if each of those were separate system calls
(since it would require less if-then logic and bit manipulation)?  Is there
any reason not to do this?

In addition, I am seeking well-commented, easy to understand scheduling
algorithms or detailed descriptions of them.  Right now I am using a nice,
simple round-robin scheduler that doesn't even take priorities into account.
  It is very efficient, however.  8-)



Also, does L4 have any support for semaphores?  I was unable to find
anything in the documentation.

Thanks
Geoff

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