Date: Thu, 11 Nov 2004 09:35:57 -0600 From: "Thomas T. Veldhouse" <veldy@veldy.net> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: freebsd-stable@freebsd.org Subject: Re: ULE Scheduler available in 5.3-RELEASE? Message-ID: <419386DD.9080905@veldy.net> In-Reply-To: <20041111153505.GA4512@odin.ac.hmc.edu> References: <41938544.9010109@veldy.net> <20041111153505.GA4512@odin.ac.hmc.edu>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig4B2EDFB3B1B84D7D502089B0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Brooks Davis wrote: >On Thu, Nov 11, 2004 at 09:29:08AM -0600, Thomas T. Veldhouse wrote: > > >>I just read in the release notes that 5.3-RELEASE has the new ULE >>scheduler available, but that 4BSD is the default scheduler. I thought >>I read messages in freebsd-current indicating that the option to use ULE >>was completely removed from the 5.3 or even the RELENG_5 branch? So, is >>ULE really available? >> >> > >ULE is not available in 5.3 or RELENG_5 due to problems that were >unfixed at the time of the release. > >-- Brooks > > > Perhaps the release notes should be updated? Here is a quote (http://www.freebsd.org/releases/5.3R/relnotes-i386.html#NEW): "The ULE scheduler has been added as an additional scheduler. Note that the conventional one, which is called 4BSD, is still used as the default scheduler in the GENERIC kernel. For the average user, interactivity is reported to be better in many cases. This means less ``skipping'' and ``jerking'' in interactive applications while the machine is very busy. This will not prevent problems due to overloaded disk subsystems, but it does help with overloaded CPUs. On SMP machines, ULE has per-CPU run queues which allow for CPU affinity, CPU binding, and advanced HyperThreading support, as well as providing a framework for more optimizations in the future. As fine-grained kernel locking continues, the scheduler will be able to make more efficient use of the available parallel resources." Thanks in advance. -- Thomas T. Veldhouse Key Fingerprint: 07C7 BF05 4176 F50B A083 4542 0118 1315 761F D300 Spammers please contact me at renegade@veldy.net. --------------enig4B2EDFB3B1B84D7D502089B0 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFBk4bdARgTFXYf0wARAlqQAJ4zKwzEsG9FMsMg4WVhuh9r16sm/wCgisB0 gATtNvuEHu8EzNg+cUhFSpI= =ITex -----END PGP SIGNATURE----- --------------enig4B2EDFB3B1B84D7D502089B0--
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