Date: Tue, 8 Nov 2005 11:45:20 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Achim Patzner <ap@bnc.net> Cc: freebsd-smp@freebsd.org Subject: Re: Multi CPU support in 6.0 Message-ID: <20051108164520.GA81940@xor.obsecurity.org> In-Reply-To: <10EFEEF4-D1D4-45FC-991C-60A4E60FB391@bnc.net> References: <01d301c5e3ae$b2461840$b3db87d4@multiplay.co.uk> <20051107152718.GA4743@tara.freenix.org> <10EFEEF4-D1D4-45FC-991C-60A4E60FB391@bnc.net>
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--ikeVEW9yuYc//A+q Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Nov 07, 2005 at 05:15:55PM +0100, Achim Patzner wrote: >=20 > Am 07.11.2005 um 16:27 schrieb Ollivier Robert: >=20 > >According to Steven Hartland: > >>I believe previously smp support in FreeBSD has been limited > >>to smaller numbers of CPU's, we've got the opportunity to test > >>an 8 way dual core ( 16 cpu's ) this week, is 6.0 up to this? > > > >I recall seeing someone on IRC saying they had a 14 CPU machine =20 > >(Sparc64 > >E4500) to play with so I think it should be ok. That would be me (machine courtesy of hrs@). He also donated a 12- and 10- CPU version, all of which I use for package building and SMP performance testing. These machines have been invaluable for testing and improving FreeBSD on SMP, and have caused innumerable bugs to be found and fixed. > 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. Kris --ikeVEW9yuYc//A+q Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDcNYeWry0BWjoQKURAgYuAKClUIDo7WDG5o884P4fNKK8WwCmawCfZY8d 8Xot7V2TNcJ8JbvMmEJqTKk= =onjs -----END PGP SIGNATURE----- --ikeVEW9yuYc//A+q--
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