Re: Which Processor and motherboard is better (new to FreeBSD)
In article <[EMAIL PROTECTED] et.telmex.com>, Paredes Snchez Martn A. <[EMAIL PROTECTED]> writes >I found in the intel web site that the Hyper-Threading has this >requirements: > >Hyper-Threading Technology requires a computer system with an >Intel Pentium 4 processor at 3.06 GHz or higher, a chipset and BIOS >that utilize this technology, and an operating system that includes >optimizations for this technology. Not exactly a "requirement", simply that Hyper-Threading is only included in Intel's top spec processors Pentium 4 >= 3.06 GHz, and on the Pentium 4 based Xeon. These processors also need a different, more expensive Intel support chip set. A fairly short description of Hyper-Threading: So that Pentium, II, 3 & 4 processors can be faster for the same clock frequency Intel added more 'units'. Where each unit can process a logic, arithmetic, floating point, instruction, so the processor can execute some slow operations at the same time as several faster ones. The limits to this are: 1. dependencies, the result of one instruction are needed for the following one (Pentium optimised compilers can sometimes rearrange instruction sequences to minimise this); 2. fetching enough instructions and data; 3. because of (2) this kind of speed up works best for loop where instructions are fetched once and repeated many times - but the fastest loops are still the shortest, and short loops tend to have lots of instructions that require the result of any instruction only 1 or 2 steps earlier. A processor with Hyper-Threading presents itself to the operating system (BSD, Linux, or even Windows 2000/XP) as two processors. The processor has more of most types of processing 'unit', and shares these, (when enabled), between two processes. The sounds very nice but a Hyper-Threaded processor less than double the number of each processor unit. For example it may have only one floating point unit to share between the two processes. In which case running one process doing floating point and another doing integer operations will run maybe 50% faster than without Hyper-Threading. However running two processes that both do floating point math will be about as fast as a non-Hyper Threaded system. A system with two Hyper Threaded processors could pick up the speed again if the two floating point tasks are split between the processors. So you can see that getting good performance from Hyper-Threading is quite hard. A 3 GHz Pentium 4 may get an average of 25% extra work done with Hyper Threading enabled. While a system with two 2 GHz Pentium 4s will probably be more powerful, and (due to Intel's exponential pricing for faster processors) probably cheaper too. Hyper-Threading will become more mainstream for Intel systems over next year or two. CPU clocks already much faster than memory (RAM) speeds. To carry on adding performance Intel are likely to increase the number of processing units and the amount of Hyper Threading further on their fastest processors, to support 3 or 4 concurrent processes. I hope that helps! Regards, Tony ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Which Processor and motherboard is better (new to FreeBSD)
Paredes Sánchez Martín A. wrote: I found in the intel web site that the Hyper-Threading has this requirements: Hyper-Threading Technology requires a computer system with an Intel Pentium 4 processor at 3.06 GHz or higher, a chipset and BIOS that utilize this technology, and an operating system that includes optimizations for this technology. By the way, what is PAE? PAE eq Page Address Extensions. It allows for 36-bit addressing, which thus lets a 32-bit computer get past the 4Gb addressing limit. They have been around on Intel archictecture for ages in some form or other. I first read about them in DDJ. A search on their website turns up http://x86.ddj.com/articles/2mpages/2mpages.htm It's also the thing that Linus Torvalds blasted a while back. http://www.theinquirer.net/?article=7966 Microsoft seem to be fairly gung-ho about it, searching on Goggle for "PAE Intel Page Address Extensions" brings up lots of links into their site. David ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
RE: Which Processor and motherboard is better (new to FreeBSD)
I found in the intel web site that the Hyper-Threading has this requirements: Hyper-Threading Technology requires a computer system with an Intel Pentium 4 processor at 3.06 GHz or higher, a chipset and BIOS that utilize this technology, and an operating system that includes optimizations for this technology. By the way, what is PAE? maps -Original Message- From: David Landgren [SMTP:[EMAIL PROTECTED] Sent: Tuesday, April 01, 2003 5:41 AM To: BSD. Subject:Re: Which Processor and motherboard is better (new to FreeBSD) Paredes Sánchez Martín A. wrote: > Hi: > > I want to build a new PC with FreeBSD, which processor > is best for FreeBSD. > > Intel builds processors and motherboards, which gave me > a feel of good performance between this two elements. > > Intel has something called Hyper-Threading Technology, > Which turbo charges your PC to respond to today's > multitasking lifestyle. 4.7 knows about hyper-threading, insofar as the kernel config file admits an 'HTT' option. As to whether it's better or not to have it, I can't really say. 2.4GHz is so ridiculously fast (kernel compiles in less than two minutes, postfix in less than a minute)... I suspect it will be difficult to detect the difference between with/without in everyday use. I'm building a new mail relay, and it turns out the machine was specified as RAID-5. I suspect that that is going to have a much more adverse impact on performance than HTT or not. As to "responding to today's multitasking lifestyle", I sooner see PAE implemented in the kernel, to unlock the memory I have above 4Gb. David ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]" ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Which Processor and motherboard is better (new to FreeBSD)
Paredes Sánchez Martín A. wrote: Hi: I want to build a new PC with FreeBSD, which processor is best for FreeBSD. Intel builds processors and motherboards, which gave me a feel of good performance between this two elements. Intel has something called Hyper-Threading Technology, Which turbo charges your PC to respond to today's multitasking lifestyle. 4.7 knows about hyper-threading, insofar as the kernel config file admits an 'HTT' option. As to whether it's better or not to have it, I can't really say. 2.4GHz is so ridiculously fast (kernel compiles in less than two minutes, postfix in less than a minute)... I suspect it will be difficult to detect the difference between with/without in everyday use. I'm building a new mail relay, and it turns out the machine was specified as RAID-5. I suspect that that is going to have a much more adverse impact on performance than HTT or not. As to "responding to today's multitasking lifestyle", I sooner see PAE implemented in the kernel, to unlock the memory I have above 4Gb. David ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Which Processor and motherboard is better (new to FreeBSD)
Hi: I want to build a new PC with FreeBSD, which processor is best for FreeBSD. Intel builds processors and motherboards, which gave me a feel of good performance between this two elements. Intel has something called Hyper-Threading Technology, Which turbo charges your PC to respond to today's multitasking lifestyle. Can FreeBSD take benefice from this? AMD only build processor but according to his web site, it gave better performance. In the AMD Athlon XP Processor Performance Benchmark says that th Pentium 4 has better performance with Hyper-Threading disabled. -TIA maps ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
