Date: Tue, 28 Jun 2005 18:39:28 +0200 From: Roman Neuhauser <neuhauser@sigpipe.cz> To: Paul Mather <paul@gromit.dlib.vt.edu> Cc: freebsd-stable@freebsd.org, Michael Schuh <michael.schuh@gmail.com> Subject: Re: FreeBSD MySQL still WAY slower than Linux Message-ID: <20050628163928.GA51923@isis.sigpipe.cz> In-Reply-To: <1119973124.7900.20.camel@zappa.Chelsea-Ct.Org> References: <1dbad315050621051525f4c6fc@mail.gmail.com> <200506211451.j5LEpA2W024350@lurza.secnetix.de> <20050628092126.GB48140@isis.sigpipe.cz> <1119973124.7900.20.camel@zappa.Chelsea-Ct.Org>
next in thread | previous in thread | raw e-mail | index | archive | help
# paul@gromit.dlib.vt.edu / 2005-06-28 11:38:44 -0400:
> Note how the transfer rate for the "outside" is almost twice that of the
> "inside." Suppose I run tests on two different operating systems, one
> of which resides in a partition on the "inside" portion and the other in
> one on the "outside" portion.
Which is not the case according to the OP...
> (Note that however good or bad it may be, the "location selection
> strategy in the driver" can only lay out data within the confines of
> the partition.) Now, I do a "dd" test and find that the "outside" OS
> is almost twice as fast as the other. Would it be wise to conclude
> that the slower OS is woefully inefficient compared to the faster one?
> Suppose both tests turn out to take roughly the same time. Should I
> conclude that the OS residing on the "inside" is just as efficient as
> the other OS?
... rendering this completely irrelevant.
I have seen people come to a freebsd list with completely flawed
comparisons or benchmarks: OSs installed on different partitions
side by side, not taking VM cache into account, whatever, and be
told that their numbers are flawed.
I have also seen people test a specific subsystem (dd), and be told
that their numbers don't reflect real world.
And I have seen people test real world performance (install FreeBSD,
install MySQL, run a stress test, reformat, install Linux, install
MySQL, run a stress test) and get responses that try to make up
reasons why the bad results are the testers fault). Heck, if
installing an operating system, a database, and running it isn't
a real world test, I don't know what is. Even if the bug is "FreeBSD
puts /var/db/mysql in the wrong part of the disk" (then it's still
a problem in FreeBSD, not in the messenger).
I just wish people here were less defensive, that's all.
--
How many Vietnam vets does it take to screw in a light bulb?
You don't know, man. You don't KNOW.
Cause you weren't THERE. http://bash.org/?255991
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050628163928.GA51923>