Date: Fri, 22 Mar 2002 20:36:37 -0800 From: Kris Kennaway <kris@obsecurity.org> To: David Wolfskill <david@catwhisker.org> Cc: jhb@FreeBSD.ORG, jroberson@chesapeake.net, current@FreeBSD.ORG Subject: Re: Peculiar(?) slowdown with -CURRENT as of 21 March Message-ID: <20020322203637.A12226@xor.obsecurity.org> In-Reply-To: <200203230234.g2N2Y0R67908@bunrab.catwhisker.org>; from david@catwhisker.org on Fri, Mar 22, 2002 at 06:34:00PM -0800 References: <20020322204145.J88743-100000@mail.chesapeake.net> <200203230234.g2N2Y0R67908@bunrab.catwhisker.org>
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--G4iJoqBmSsgzjUCe Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Mar 22, 2002 at 06:34:00PM -0800, David Wolfskill wrote: > >Date: Fri, 22 Mar 2002 20:43:03 -0500 (EST) > >From: Jeff Roberson <jroberson@chesapeake.net> >=20 > >Are you both running with WITNESS and INVARIANTS? UMA is slightly slower > >with these options on than the original malloc & vm_zone code. I'm not > >sure why it would be even worse for SMP machines though. So maybe it > >isn't UMA at all but it's worth looking into. >=20 > I don't speak (or write) for John, but yes, I have both WITNESS & > INVARIANTS in my -CURRENT kernels. (The link I posted refers to a page > that has copies of each kernel config, among other bits of trivia.) As more locks are added to the kernel the overhead of WITNESS becomes greater. 21 March was around the time of Jeff's UMA commit. Kris --G4iJoqBmSsgzjUCe Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE8nAZVWry0BWjoQKURAsbMAKDl03g7PfXj5KGCflZPaoQIM0qzGwCeKt7S Q7fZze4c3SIYszuW3ZR9VYc= =+f7l -----END PGP SIGNATURE----- --G4iJoqBmSsgzjUCe-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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