Date: Fri, 28 Oct 2005 15:47:39 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Robert Watson <rwatson@FreeBSD.org> Cc: Doug Poland <doug@polands.org>, freebsd-current@freebsd.org Subject: Re: 6.0 and "options PREEMPTION" Message-ID: <20051028194739.GA21723@xor.obsecurity.org> In-Reply-To: <20051028140301.X20147@fledge.watson.org> References: <20051028045457.GA44396@polands.org> <20051028140301.X20147@fledge.watson.org>
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--mP3DRpeJDSE+ciuQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Oct 28, 2005 at 02:04:37PM +0100, Robert Watson wrote: > On Thu, 27 Oct 2005, Doug Poland wrote: >=20 > > One of the other nice benefits to the SMPVFS work is that > > with our fully preemptive 6.x kernel, not holding the Giant > > lock over the file system code lets the file system code not > > only preempt lower precedence kernel threads, such as > > background crypto operations or file system operations, but be > > preempted by more timing critical code, such as sound card > > interrupts, network I/O, and so on. > > > >Does this mean that options PREEMPTION is assumed in 6.0? If not, could= =20 > >someone explain or point me to some docs that will help me understand. >=20 > In FreeBSD 6.0 and higher, options PREEMPTION appears in the default=20 > kernel configuration (GENERIC). Not on all architectures, though. e.g. PREEMPTION is not supported on sparc64. Kris --mP3DRpeJDSE+ciuQ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDYoBbWry0BWjoQKURAkvWAKChrLEUCNCLPN03bb4YA4Wx6RXXxgCfWH1e Pc6eC7s6argwtM9FkC8Rtbk= =09q+ -----END PGP SIGNATURE----- --mP3DRpeJDSE+ciuQ--
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