Date: Wed, 25 May 2005 16:08:49 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Jon Dama <jd@ugcs.caltech.edu> Cc: Bjarne Wichmann Petersen <freebsd.nospam@mekanix.dk>, Mike Jakubik <mikej@rogers.com>, Matthias Buelow <mkb@incubus.de>, 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: <20050525230848.GA62267@xor.obsecurity.org> In-Reply-To: <Pine.LNX.4.53.0505251554200.5486@riyal.ugcs.caltech.edu> References: <3248.172.16.0.199.1116876092.squirrel@172.16.0.1> <200505252342.01938.freebsd.nospam@mekanix.dk> <20050525214555.GA41695@xor.obsecurity.org> <200505260014.37054.freebsd.nospam@mekanix.dk> <Pine.LNX.4.53.0505251520530.5486@riyal.ugcs.caltech.edu> <20050525223811.GA58132@xor.obsecurity.org> <Pine.LNX.4.53.0505251554200.5486@riyal.ugcs.caltech.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
--zhXaljGHf11kAtnf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, May 25, 2005 at 04:02:58PM -0700, Jon Dama wrote: > It's different, yes. But the trouble is that you need a controlled > interrupt source--i.e., you have to have some concept of when an "event" > might have been handled (were it not for such and such activity). >=20 > I posit that without that counterfactual talking about PREEMPTION is > meaningless. >=20 > The technique I mentioned--measuring and comparing the jitter was intended > to quash measuring the performance of the network stack itself. >=20 > Do you have an idea how you can pose that counterfactual in a synthetic > arrangement more closely connected with the problem at hand? Nope..that's why I said it was a hard thing to study. Well-controlled benchmarking of FreeBSD is always welcome, so please feel free to proceed with your tests and let us know of anything interesting you identify. Kris --zhXaljGHf11kAtnf Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFClQWAWry0BWjoQKURAv5PAKDT09jP/GauM6n0pfSu+RWWoCGJbQCgi7Xu 8bA+YDHBdBJtOPmK42Vg8Oc= =73j/ -----END PGP SIGNATURE----- --zhXaljGHf11kAtnf--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050525230848.GA62267>