Hi,
On a PIII 600E, compiling a week old 4.2S kernel with the following
options:
-O2 -fomit-frame-pointer -mpentium -march=pentium -pipe
Cause the kernel to produce TCP CRC errors when talking to certain IP
addresses. It generally seemed to get the 2nd octet of the CRC out by one
i.e. 0xb9f7 became 0xbaf7 etc.
I originally did this, because I was using this fastish machine to
remake world for another P166 machine. I forgot to change it back and
accidentally recompiled it's own kernel with the above settings.
This problem was fixed by simply changing the gcc optimisation to the
correct CPU type:
-O2 -fomit-frame-pointer -mpentiumpro -march=pentiumpro -pipe
However, shouldn't the PIII be backwards compatible with any Pentium code?
Or are there some incorrect assumptions made in the CRC generation code?
Cheers.
BTW Where in the source is the CRC generated?
Mark Powell - UNIX System Administrator - The University of Salford
Academic Information Services, Clifford Whitworth Building,
Salford University, Manchester, M5 4WT, UK.
Tel: +44 161 295 5936 Fax: +44 161 295 5888 www.pgp.com for PGP key
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-stable" in the body of the message
