Date: Sat, 28 May 2005 11:28:00 -0700 From: Kris Kennaway <kris@obsecurity.org> To: freebsd-questions@freebsd.org Subject: Re: Problem with HT support in 5.4 Message-ID: <20050528182800.GA64369@xor.obsecurity.org> In-Reply-To: <20050528134552.GB1138@keyslapper.net> References: <20050527085445.38de5553@jacob.6texans.net> <b7052e1e05052707056d4faa4@mail.gmail.com> <20050527093046.748e33c1@jacob.6texans.net> <k8if91l97645ftmllfs8ittdvablmk8is3@4ax.com> <20050528134552.GB1138@keyslapper.net>
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--bg08WKrSYDhXBjb5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, May 28, 2005 at 09:45:52AM -0400, Louis LeBlanc wrote: > On 05/27/05 09:28 PM, Mike Tancsa sat at the `puter and typed: > > On Fri, 27 May 2005 09:30:46 -0500, in sentex.lists.freebsd.questions > > you wrote: > > >>=20 > > >> Oh, wait, it is probably just the last HT security patch, > > >> ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.h= tt.asc. > > > > > >hmm... So basically, SMP can be enabled, but it won't use HT even if it > > >sees a capable processor?=20 > >=20 > > Unless you use the ULE scheduler (which is broken and buggy on > > RELENG_5) there is no benefit to using HT. In fact, it will make some > > things worse. >=20 > Are you sure about that? I'm using the BSD scheduler on 5.3 > (upgrading to 5.4 later today), with HT enabled, and I don't have > problems. In fact, I can do a make buildworld AND play neverwinter > nights at the same time without seeing any problems. He means that some workloads will be slower with HT than without. It's very much workload-specific though, so you have to test and see how it performs for you. Kris --bg08WKrSYDhXBjb5 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCmLgwWry0BWjoQKURAjXVAKD5lC88j1+p0jUa7T0mqq3Y6zHkCACcCJMx AmwY2iURONxR3tUMUnLnBrU= =L/Mu -----END PGP SIGNATURE----- --bg08WKrSYDhXBjb5--
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