SMP questions
Hi all, I have 3 questions regrading SMP on freebsd 6.x: 1. Is there any userland tool/api to bound a process to a specific cpu? 2. Is there any way to force UP operation apart form recompiling kernel without SMP option? 3. Can someone shed some light on the logic of how schedulers (4.4.BSD/ULE) dispatch processes among CPUs? -- Best regards. Hooman Fazaeli [EMAIL PROTECTED] Sepehr S. T. Co. Ltd. Web: http://www.sepehrs.com Tel: (9821)88975701-2 Fax: (9821)88983352 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: SMP questions
On Thursday 28 August 2008 07:59:00 H.fazaeli wrote: Hi all, I have 3 questions regrading SMP on freebsd 6.x: 1. Is there any userland tool/api to bound a process to a specific cpu? I don't think so. FreeBSD 7.x just got cpuset backported from -CURRENT. -- Kirk Strauser ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: SMP questions
H.fazaeli wrote: Hi all, I have 3 questions regrading SMP on freebsd 6.x: 1. Is there any userland tool/api to bound a process to a specific cpu? This support is native to 8-CURRENT, I think most of it is backported to 7.1. 2. Is there any way to force UP operation apart form recompiling kernel without SMP option? mostly - if you have a SMP kernel it will always use SMP locking and scheduling algorithms, which are in 6.x somewhat slower than the UP variants. You can force the kernel to use only one CPU with machdep.hlt_cpus sysctl: sysctl -d machdep.hlt_cpus machdep.hlt_cpus: Bitmap of CPUs to halt. 101 (binary) will halt CPUs 0 and 2. (note that you have to give a decimal number to the sysctl) 3. Can someone shed some light on the logic of how schedulers (4.4.BSD/ULE) dispatch processes among CPUs? 4.4BSD has a single queue of running threads from which the threads are dispatched to CPUs when needed, in a way that's similar in effect to round-robin. ULE has separate per-CPU queues and is aware of CPU topologies so it knows that dispatching threads to cores on the same physical CPU is better than picking a distant CPU. (this is all about ULE in 7-STABLE and 8-CURRENT. ULE in 6.x is broken). This is why 4.4BSD scales less well than ULE (but on the other hand 4.4BSD has had many decades of hand optimizations and there are even now reports that it behaves better in some edge circumstances). signature.asc Description: OpenPGP digital signature
Re: Some SMP questions
--On February 23, 2006 7:23:53 PM -0500 Jerry Bell [EMAIL PROTECTED] wrote: The default kernel doesn't support SMP. You have to recompile with the SMP config and it'll start getting your other processor. Thanks, Jerry. I've compiled a few Linux kernels, and I can tell you, compiling the FreeBSD kernel was a breeze in comparison. Thanks for the quick (and correct) response. Paul Schmehl ([EMAIL PROTECTED]) Adjunct Information Security Officer University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Some SMP questions
When you do a default install of 6.0-RELEASE, does the kernel have support for SMP? Or do you have to compile a custom kernel to get that? Does this mean SMP is not enabled? kern.smp.cpus: 1 kern.smp.disabled: 0 kern.smp.active: 0 kern.smp.maxcpus: 1 Can I set these with sysctl? Or do I need to recompile the kernel? (I'm assuming I need this: kern.smp.cpus: 2 kern.smp.disabled: 0 kern.smp.active: 1 kern.smp.maxcpus: 2 Paul Schmehl ([EMAIL PROTECTED]) Adjunct Information Security Officer University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu/ir/security/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Some SMP questions
The default kernel doesn't support SMP. You have to recompile with the SMP config and it'll start getting your other processor. Regards, Jerry http://www.bsdsec.com Paul Schmehl wrote: When you do a default install of 6.0-RELEASE, does the kernel have support for SMP? Or do you have to compile a custom kernel to get that? Does this mean SMP is not enabled? kern.smp.cpus: 1 kern.smp.disabled: 0 kern.smp.active: 0 kern.smp.maxcpus: 1 Can I set these with sysctl? Or do I need to recompile the kernel? (I'm assuming I need this: kern.smp.cpus: 2 kern.smp.disabled: 0 kern.smp.active: 1 kern.smp.maxcpus: 2 Paul Schmehl ([EMAIL PROTECTED]) Adjunct Information Security Officer University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu/ir/security/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: FreeBSD newbie general and SMP questions for i386]
Hi there Mark! - Original Message - From: Mark Wolfskehl [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, December 18, 2003 2:42 PM Subject: FreeBSD newbie general and SMP questions for i386] Hi, I'm a FreeBSD newbie. I'm considering installing either FreeBSD i386 or Linux on a 2 AMD Athelon CPU machine. The motherboard is an ASUS A7M266-D, and the machine has 2GB memory installed. I'm working on trying to answer some key questions before making a final decision which OS to install (right now the other alternative is SuSe Linux), but perhaps if anyone has some quick answers that would be a help: 1. How stable is SMP support in 5.1, especially compared to the stability of single CPU FreeBSD and Linux in general? As one newbie to another, I have found FreeBSD to be VERY stable when compared to Mandrake Linux. 2. In general, how could I characterize the relative performance of FreeBSD and Linux under an SMP kernel and/.or single processors? My suggestion would be a common benchmark program that both O/Ses can use 3. I'm looking into whether my motherboard conforms to the FreeBSD requirements. I don't know if the 'Intel MP' means you have to have genuine Intel processors, in particular. If anyone can get a quick answer to this, that would be critical, of course. ASUS's website is www.asus.com, and you can just do a search for the motherboard model. They have all the specs and the users manual in pdf online. Thanks in advance. I'm using AMD stuff with FreeBSD with no hassels... 4. How compatible is FreeBSD with Linux in practice? I understand there is a Linux compatibility module for the kernel? There is a Linux compatibility module for the kernel which I have used for VMWare, which sort of answers your next question :) 5. Will FreeBSD run VMWare Workstation virtual machine SW for Linux (in practice)? Yes, it will as I have done so, just had a little problem with getting Win98 Installed under it... 6. Anything else I should know as a newbie? Basically read the FreeBSD handbook under /usr/share/doc/handbook/ under the FreeBSD installation, it gives good advice on how to get up and running well. Hope this helps! Elijah [EMAIL PROTECTED] Whew! That's a lot, but thanks in advance! Mark Wolfskehl [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.551 / Virus Database: 343 - Release Date: 11/12/03 ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: FreeBSD newbie general and SMP questions for i386]
On Wed, Dec 17, 2003 at 05:42:19PM -0800, Mark Wolfskehl wrote: Hi, I'm a FreeBSD newbie. I'm considering installing either FreeBSD i386 or Linux on a 2 AMD Athelon CPU machine. The motherboard is an ASUS A7M266-D, and the machine has 2GB memory installed. I'm working on trying to answer some key questions before making a final decision which OS to install (right now the other alternative is SuSe Linux), but perhaps if anyone has some quick answers that would be a help: 1. How stable is SMP support in 5.1, especially compared to the stability of single CPU FreeBSD and Linux in general? I'm running FreeBSD 5.1 on a dual p-pro system, 4.9 on a dual AMD system, and until recently I was running Debian Linux on a dual p3...I can't say that any of them were unstable. 2. In general, how could I characterize the relative performance of FreeBSD and Linux under an SMP kernel and/.or single processors? 3. I'm looking into whether my motherboard conforms to the FreeBSD requirements. I don't know if the 'Intel MP' means you have to have genuine Intel processors, in particular. If anyone can get a quick answer to this, that would be critical, of course. ASUS's website is www.asus.com, and you can just do a search for the motherboard model. They have all the specs and the users manual in pdf online. Thanks in advance. I'm running a dual socket A Gigabyte motherboard, and the only issue that I've had with it is that the system hangs if I try to use the nvidia drivers for X. I've heard from someone with a Tyan Tiger board using the same chipset (MPX) that they've had the same problem. Other than that I've had no issues at all. Josh Paetzel ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
FreeBSD newbie general and SMP questions for i386]
Hi, I'm a FreeBSD newbie. I'm considering installing either FreeBSD i386 or Linux on a 2 AMD Athelon CPU machine. The motherboard is an ASUS A7M266-D, and the machine has 2GB memory installed. I'm working on trying to answer some key questions before making a final decision which OS to install (right now the other alternative is SuSe Linux), but perhaps if anyone has some quick answers that would be a help: 1. How stable is SMP support in 5.1, especially compared to the stability of single CPU FreeBSD and Linux in general? 2. In general, how could I characterize the relative performance of FreeBSD and Linux under an SMP kernel and/.or single processors? 3. I'm looking into whether my motherboard conforms to the FreeBSD requirements. I don't know if the 'Intel MP' means you have to have genuine Intel processors, in particular. If anyone can get a quick answer to this, that would be critical, of course. ASUS's website is www.asus.com, and you can just do a search for the motherboard model. They have all the specs and the users manual in pdf online. Thanks in advance. 4. How compatible is FreeBSD with Linux in practice? I understand there is a Linux compatibility module for the kernel? 5. Will FreeBSD run VMWare Workstation virtual machine SW for Linux (in practice)? 6. Anything else I should know as a newbie? Whew! That's a lot, but thanks in advance! Mark Wolfskehl [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
