Date: Mon, 09 Feb 2004 19:27:08 +0100 From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) To: Dung Patrick <dkt@digitalme.com> Cc: freebsd-hackers@freebsd.org Subject: Re: [call for helpers!] Tuning for the Beaver Challenge Message-ID: <xzpznbsxg5f.fsf@dwp.des.no> In-Reply-To: <1076348333.b793fda0dkt@digitalme.com> (Dung Patrick's message of "Tue, 10 Feb 2004 01:38:53 %2B0800") References: <1076348333.b793fda0dkt@digitalme.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Dung Patrick <dkt@digitalme.com> writes:
> For those optionts CPU_FASTER_5X86_FPU through CPU_UPGRADE_HW_CACHE,
> it is suggested by an user in the forum. I would like to see the
> comments from the mailing list. If those options are dangerous, then
> don't use them.
CPU_FASTER_5X86_FPU is not likely to have any positive impact on
performance, and fairly likely to render the system unbootable.
CPU_UPGRADE_HW_CACHE has absolutely no effect on non-PC98 systems.
further comments -
- symlink /usr/{src,obj,ports} to /slow/{src,obj,ports} where /slow
is a filesystem placed on the outside edge of the disk (to free up
space near the spindle for the filesystems actually used by the
benchmark)
- find out what file system the Linux people are using. if they are
using ext2fs or ext3fs, mount your filesystems async.
- most of what you put in sysctl.conf is completely irrelevant. the
rest needs to be tuned according to the actual needs of the
benchmark.
- you should not tune kern.maxfiles etc. unless the benchmark
actually hits those limits. increasing these numbers reduces the
amount of kernel memory available for other purposes.
btw, maxfiles and maxfilesperproc are tunable at run time.
- most of what you put in make.conf is bogus. just use
CPUTYPE ?=3D pentiumpro
CFLAGS =3D -O -pipe
COPTFLAGS =3D -O -pipe
- NOPROFILE has absolutely no impact on performance (except that it
shortens 'make world' a little)
- you *must* use -CURRENT and not 5.2 as the latter has issues with
the aac driver.
- don't use apm or acpi on 4.x.
- regarding jdk 1.4.2, just use the linux version (and make sure to
mount linprocfs). I very much doubt you'll notice a difference in
performance.
- mysql buffer and cache sizes etc. should imho be the same on all
test systems.
- some of the "papers" you reference ([3] and [4]) contain more
incorrect and dangerous information than useful advice.
DES
--=20
Dag-Erling Sm=F8rgrav - des@des.no
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?xzpznbsxg5f.fsf>