At 2:12 PM -0600 2/26/02, Bob Van Valzah wrote:
>Yes, good point, sorry. I shouldn't've glossed over that.
>
>The short answer is that I used GENERIC kernels with as few changes
>as possible. So on -CURRENT, the kernel I tested with was running
>INVARIANTS, INVARIANT_SUPPORT, WITNESS, and WITNESS_SKIPSPIN. These
>were not set on my test -STABLE kernel since they're not set in
>GENERIC there.
The thing is, -STABLE doesn't need all the extra sanity-checking
code, so it is not compiled in. But with all the wide-ranging
changes going on in -CURRENT, it is much more important to have
the extra checking.
>If these settings are causing large differences in timings, I think
>it'll show up when I compare kgmon/gprof results between kernels. I
>can also just compile a kernel without these settings and see how it
>differs.
You will find that these settings make a huge difference in the
timings of many things.
>I'm still very new to this so I'm trying to map the benchmarking
>space and see where there are interesting questions. You've opened
>my eyes to an area I'd missed but should've seen. Are there others?
Probably, but I don't know enough to say what they are... :-)
--
Garance Alistair Drosehn = gad@eclipse.acs.rpi.edu
Senior Systems Programmer or gad@freebsd.org
Rensselaer Polytechnic Institute or drosih@rpi.edu
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-smp" in the body of the message