Re: ULE Scheduler available in 5.3-RELEASE?
Can you describe advantages of using SCHED_ULE on UP? or just link or something. Michael Nottebrock wrote: On Thursday, 11. November 2004 16:42, Ronald Klop wrote: On Thu, 11 Nov 2004 09:29:08 -0600, Thomas T. Veldhouse [EMAIL PROTECTED] 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? Not in RELENG_5 and not in RELENG_5_3. There are issues with it. If it is fixed it will come back. See this line in /usr/src/sys/kern/sched_ule.c: #error The SCHED_ULE scheduler is broken. Please use SCHED_4BSD ... which of course you can just patch out. :) I'm still using ULE on my (UP) machine, works fine for me. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
ULE Scheduler available in 5.3-RELEASE?
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? -- Thomas T. Veldhouse Key Fingerprint: 07C7 BF05 4176 F50B A083 4542 0118 1315 761F D300 Spammers please contact me at [EMAIL PROTECTED] signature.asc Description: OpenPGP digital signature
Re: ULE Scheduler available in 5.3-RELEASE?
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 -- Any statement of the form X is the one, true Y is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 pgpHDg42IWgeI.pgp Description: PGP signature
Re: ULE Scheduler available in 5.3-RELEASE?
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 [EMAIL PROTECTED] signature.asc Description: OpenPGP digital signature
Re: ULE Scheduler available in 5.3-RELEASE?
On Thu, 11 Nov 2004 09:29:08 -0600, Thomas T. Veldhouse [EMAIL PROTECTED] 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? Not in RELENG_5 and not in RELENG_5_3. There are issues with it. If it is fixed it will come back. See this line in /usr/src/sys/kern/sched_ule.c: #error The SCHED_ULE scheduler is broken. Please use SCHED_4BSD Ronald. -- Ronald Klop, Amsterdam, The Netherlands ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ULE Scheduler available in 5.3-RELEASE?
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 [EMAIL PROTECTED] I beleive the errata document takes precedance over the release notes. In which case... (http://www.freebsd.org/releases/5.3R/errata.html#OPEN-ISSUES) (1 Nov 2004) The ULE scheduler described in the release notes has been completely disabled to discourage its use because it has stability problems. -- Mark Magiera ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: ULE Scheduler available in 5.3-RELEASE?
On Thursday, 11. November 2004 16:42, Ronald Klop wrote: On Thu, 11 Nov 2004 09:29:08 -0600, Thomas T. Veldhouse [EMAIL PROTECTED] 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? Not in RELENG_5 and not in RELENG_5_3. There are issues with it. If it is fixed it will come back. See this line in /usr/src/sys/kern/sched_ule.c: #error The SCHED_ULE scheduler is broken. Please use SCHED_4BSD ... which of course you can just patch out. :) I'm still using ULE on my (UP) machine, works fine for me. -- ,_, | Michael Nottebrock | [EMAIL PROTECTED] (/^ ^\) | FreeBSD - The Power to Serve | http://www.freebsd.org \u/ | K Desktop Environment on FreeBSD | http://freebsd.kde.org pgp5FXsD7ht0V.pgp Description: PGP signature
