Date: Mon, 23 May 2005 14:31:55 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Matthias Buelow <mkb@incubus.de> Cc: Mike Jakubik <mikej@rogers.com>, freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches) Message-ID: <20050523213155.GA46718@xor.obsecurity.org> In-Reply-To: <42924949.1070902@incubus.de> References: <3248.172.16.0.199.1116876092.squirrel@172.16.0.1> <20050523195123.GA13810@xor.obsecurity.org> <3482.172.16.0.199.1116882013.squirrel@172.16.0.1> <20050523211307.GA36552@xor.obsecurity.org> <42924949.1070902@incubus.de>
next in thread | previous in thread | raw e-mail | index | archive | help
--J/dobhs11T7y2rNN Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, May 23, 2005 at 11:21:13PM +0200, Matthias Buelow wrote: > Kris Kennaway wrote: >=20 > > One thing that probably confuses and misleads a lot of people is when > > they build world or a kernel and notice that it's taking much longer > > than it did under 4.x, so they assume this means that 5.x is slower > > than 4.x. It doesn't. What it means is that 5.x and 4.x have > > different C compilers, and gcc 3.x is much slower at compiling code > > than gcc 2.x. You have to be very careful to draw conclusions based > > on subjective assessments like this. >=20 > Another thing might be that interactive response time seems to be worse. > While I (or rather ports) unpack the firefox/thunderbird source, the > machine is pretty much bogged down (mouse cursor jumps around, audio > stutters...). Haven't seen that on FreeBSD since the 386 days. I don't run FreeBSD on my desktop machines so I haven't seen this myself. One obvious guess is that it's due to VFS being under Giant, which causes lots of contention with other subsystems that also require Giant, and therefore introduces latency. If so, you'd see a substantial performance improvement on 6.0 with debug.mpsafevfs=3D1. This option isn't yet ready for production use (especially on SMP machines) since it still contains bugs, but it would be interesting if someone who sees this problem could test it on 6.0. Any takers? Kris --J/dobhs11T7y2rNN Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCkkvLWry0BWjoQKURAqNQAJ0Zd4M/yKHWiU4kahGEc0GrGeJeTwCfajfJ cUMJDYFD6sEC4EDFH69XbeY= =gj/K -----END PGP SIGNATURE----- --J/dobhs11T7y2rNN--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050523213155.GA46718>