* Xeon processors &&Hyper-Threading @ 2003-06-13 16:38 Joe 2003-06-13 16:39 ` Chris Friesen 2003-06-13 16:45 ` Richard B. Johnson 0 siblings, 2 replies; 7+ messages in thread From: Joe @ 2003-06-13 16:38 UTC (permalink / raw) To: linux-kernel Does Linux support the Xeon (p4) processor and its capabilities? The company I work for recently ported its application to Linux and one of our current HP clients asked this and I figure it would be just a recompile the kernel as a P4, but not sure if this would do it. I'm not asking if Linux can RUN the Xeon processor. I'm asking if Linux processor takes any advantage of the Hyper-Threading built into this processor? below is a link to more info on this. http://www.intel.com/design/xeon/prodbref/ Joe ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Xeon processors &&Hyper-Threading 2003-06-13 16:38 Xeon processors &&Hyper-Threading Joe @ 2003-06-13 16:39 ` Chris Friesen 2003-06-13 16:45 ` Richard B. Johnson 1 sibling, 0 replies; 7+ messages in thread From: Chris Friesen @ 2003-06-13 16:39 UTC (permalink / raw) To: Joe; +Cc: linux-kernel Joe wrote: > I'm not asking if Linux can RUN the Xeon processor. > > I'm asking if Linux processor takes any advantage of the Hyper-Threading > built into this processor? The kernel has full support for hyperthreading. Be aware however that it doesn't always buy you any performance gain and can actually result in performance decrease. Chris -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Xeon processors &&Hyper-Threading 2003-06-13 16:38 Xeon processors &&Hyper-Threading Joe 2003-06-13 16:39 ` Chris Friesen @ 2003-06-13 16:45 ` Richard B. Johnson 2003-06-14 13:50 ` Mark Watts 2003-06-14 18:32 ` Joe 1 sibling, 2 replies; 7+ messages in thread From: Richard B. Johnson @ 2003-06-13 16:45 UTC (permalink / raw) To: Joe; +Cc: linux-kernel On Fri, 13 Jun 2003, Joe wrote: > Does Linux support the Xeon (p4) processor and its capabilities? > > The company I work for recently ported its application to Linux and one > of our current HP clients asked this and I figure it would be just a > recompile the kernel as a P4, but not sure if this would do it. > > I'm not asking if Linux can RUN the Xeon processor. > > I'm asking if Linux processor takes any advantage of the Hyper-Threading > built into this processor? > > below is a link to more info on this. > > http://www.intel.com/design/xeon/prodbref/ > > Joe > You recompile the kernel for SMP as well as P4. If the motherboard hasn't disabled HT capabilities, you will take full advantage of the processor under Linux. Whatever "full advantage" means, is not absolute, but whatever it is, will be used to its fullest. Basically, if the code is I/O bound, you'll not see any difference. If the code is compute-intensive, you will. Cheers, Dick Johnson Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it. ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Xeon processors &&Hyper-Threading 2003-06-13 16:45 ` Richard B. Johnson @ 2003-06-14 13:50 ` Mark Watts 2003-06-16 21:49 ` James Cleverdon 2003-06-14 18:32 ` Joe 1 sibling, 1 reply; 7+ messages in thread From: Mark Watts @ 2003-06-14 13:50 UTC (permalink / raw) To: linux-kernel > You recompile the kernel for SMP as well as P4. If the motherboard > hasn't disabled HT capabilities, you will take full advantage of > the processor under Linux. Whatever "full advantage" means, is > not absolute, but whatever it is, will be used to its fullest. > Basically, if the code is I/O bound, you'll not see any difference. > If the code is compute-intensive, you will. I discovered that you need the 'CPU Enumeration' part of ACPI to be enabled otherwise the kernel only sees physical processors, not sibling HT processors - shouldnt this be selected automatically when you select SMP ? ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Xeon processors &&Hyper-Threading 2003-06-14 13:50 ` Mark Watts @ 2003-06-16 21:49 ` James Cleverdon 0 siblings, 0 replies; 7+ messages in thread From: James Cleverdon @ 2003-06-16 21:49 UTC (permalink / raw) To: Mark Watts, linux-kernel On Saturday 14 June 2003 06:50 am, Mark Watts wrote: > > You recompile the kernel for SMP as well as P4. If the motherboard > > hasn't disabled HT capabilities, you will take full advantage of > > the processor under Linux. Whatever "full advantage" means, is > > not absolute, but whatever it is, will be used to its fullest. > > Basically, if the code is I/O bound, you'll not see any difference. > > If the code is compute-intensive, you will. > > I discovered that you need the 'CPU Enumeration' part of ACPI to be enabled > otherwise the kernel only sees physical processors, not sibling HT > processors - shouldnt this be selected automatically when you select SMP ? > - Not if you have enabled full ACPI, or if you don't have any P4s. Some folks don't want any ACPI in their kernel at all. 8^) It's possible for 'CPU Enumeration Only' to be turned on auto-magically, but no one has written comprehensive enough logic into the config code, yet.... -- James Cleverdon IBM xSeries Linux Solutions {jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Xeon processors &&Hyper-Threading 2003-06-13 16:45 ` Richard B. Johnson 2003-06-14 13:50 ` Mark Watts @ 2003-06-14 18:32 ` Joe 2003-06-14 19:08 ` Joe 1 sibling, 1 reply; 7+ messages in thread From: Joe @ 2003-06-14 18:32 UTC (permalink / raw) To: root; +Cc: linux-kernel Thanks, I was asked this by one of our clients, and told them that they would probably have to recompile their kernel. Joe Richard B. Johnson wrote: > On Fri, 13 Jun 2003, Joe wrote: > > >>Does Linux support the Xeon (p4) processor and its capabilities? >> >>The company I work for recently ported its application to Linux and one >>of our current HP clients asked this and I figure it would be just a >>recompile the kernel as a P4, but not sure if this would do it. >> >>I'm not asking if Linux can RUN the Xeon processor. >> >>I'm asking if Linux processor takes any advantage of the Hyper-Threading >>built into this processor? >> >>below is a link to more info on this. >> >>http://www.intel.com/design/xeon/prodbref/ >> >>Joe >> > > > You recompile the kernel for SMP as well as P4. If the motherboard > hasn't disabled HT capabilities, you will take full advantage of > the processor under Linux. Whatever "full advantage" means, is > not absolute, but whatever it is, will be used to its fullest. > Basically, if the code is I/O bound, you'll not see any difference. > If the code is compute-intensive, you will. > > Cheers, > Dick Johnson > Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips). > Why is the government concerned about the lunatic fringe? Think about it. > > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Xeon processors &&Hyper-Threading 2003-06-14 18:32 ` Joe @ 2003-06-14 19:08 ` Joe 0 siblings, 0 replies; 7+ messages in thread From: Joe @ 2003-06-14 19:08 UTC (permalink / raw) To: linux-kernel Don't linux vendors ship a variety of precompiled kernels to match the various hardware scenarios? I'm trying to imagine why a customer would ever want or need to roll their own... Joe Joe wrote: > Thanks, I was asked this by one of our clients, and told them that > they would probably have to recompile their kernel. > > Joe > > > Richard B. Johnson wrote: > >> On Fri, 13 Jun 2003, Joe wrote: >> >> >>> Does Linux support the Xeon (p4) processor and its capabilities? >>> >>> The company I work for recently ported its application to Linux and one >>> of our current HP clients asked this and I figure it would be just a >>> recompile the kernel as a P4, but not sure if this would do it. >>> >>> I'm not asking if Linux can RUN the Xeon processor. >>> >>> I'm asking if Linux processor takes any advantage of the >>> Hyper-Threading >>> built into this processor? >>> >>> below is a link to more info on this. >>> >>> http://www.intel.com/design/xeon/prodbref/ >>> >>> Joe >>> >> >> >> You recompile the kernel for SMP as well as P4. If the motherboard >> hasn't disabled HT capabilities, you will take full advantage of >> the processor under Linux. Whatever "full advantage" means, is >> not absolute, but whatever it is, will be used to its fullest. >> Basically, if the code is I/O bound, you'll not see any difference. >> If the code is compute-intensive, you will. >> >> Cheers, >> Dick Johnson >> Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips). >> Why is the government concerned about the lunatic fringe? Think about >> it. >> ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2003-06-16 21:35 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2003-06-13 16:38 Xeon processors &&Hyper-Threading Joe 2003-06-13 16:39 ` Chris Friesen 2003-06-13 16:45 ` Richard B. Johnson 2003-06-14 13:50 ` Mark Watts 2003-06-16 21:49 ` James Cleverdon 2003-06-14 18:32 ` Joe 2003-06-14 19:08 ` Joe
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