In message <[EMAIL PROTECTED]>, Dan Nelson writes: >I think this just demonstrates that you should not run benchmarks with >all your debugging flags enabled :) Most people will not be running >production systems with WITNESS, and parts of the kernel that bog down >under the heavy load of WITNESS may work just fine on a regular kernal >config.
To quote from src/UPDATING: ] NOTE TO PEOPLE WHO THINK THAT 5.0-CURRENT IS SLOW: ] FreeBSD 5.0-CURRENT has many debugging features turned on, in ] both the kernel and userland. These features attempt to detect ] incorrect use of system primitives, and encourage loud failure ] through extra sanity checking and fail stop semantics. They ] also substantially impact system performance. If you want to ] do performance measurement, benchmarking, and optimization, ] you'll want to turn them off. This includes various WITNESS- ] related kernel options, INVARIANTS, malloc debugging flags ] in userland, and various verbose features in the kernel. Many ] developers choose to disable these features on build machines ] to maximize performance. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
