Date: Tue, 8 Nov 2005 12:52:03 -0500 From: Kris Kennaway <kris@obsecurity.org> To: David Landgren <david@landgren.net> Cc: freebsd-smp@freebsd.org Subject: Re: Multi CPU support in 6.0 Message-ID: <20051108175203.GA7472@xor.obsecurity.org> In-Reply-To: <4370E4C3.5000204@landgren.net> References: <01d301c5e3ae$b2461840$b3db87d4@multiplay.co.uk> <20051107152718.GA4743@tara.freenix.org> <10EFEEF4-D1D4-45FC-991C-60A4E60FB391@bnc.net> <20051108164520.GA81940@xor.obsecurity.org> <4370E4C3.5000204@landgren.net>
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--+QahgC5+KEYLbs62 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Nov 08, 2005 at 06:47:47PM +0100, David Landgren wrote: > And Kris Kennaway did write: >=20 > >On Mon, Nov 07, 2005 at 05:15:55PM +0100, Achim Patzner wrote: > > > >>Am 07.11.2005 um 16:27 schrieb Ollivier Robert: > >> >=20 > [...] >=20 > >>I remember someone writing that the intermediate state of -CURRENT =20 > >>while removing the giant lock around the kernel wasn't viable with =20 > >>more than four CPUs as it would completely deadlock from time to =20 > >>time. I guess we're a bit further down the road... > > > > > >That certainly seems to be the case. You want to use FreeBSD 6.0, > >which has excellent performance and stability on SMP in my testing, > >even with 14 CPUs. FreeBSD 5.4 is definitely not up to it, since VFS > >is under Giant. >=20 > Well I'm going to take the plunge and bring an HP Netserver LT 6000 with= =20 > 6 CPUs up from 5.4-STABLE to 6. >=20 > Are there any obvious additions or subtractions from a 5.x kernel=20 > configuration file? Is ADAPTIVE_GIANT now obsolete? I think you still want it - it was a net win the last time I measured it. That's it though, really. Kris --+QahgC5+KEYLbs62 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDcOXDWry0BWjoQKURApfGAKDnPQIzdmj1qY252sKPY3iPBaM6bgCeJ13x H3S0WJI/O7laZL7v3rVORSk= =x5P0 -----END PGP SIGNATURE----- --+QahgC5+KEYLbs62--
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