* SMP on different cores. @ 2016-09-22 11:16 Madhu K 2016-09-22 12:17 ` Greg KH 2016-09-22 14:29 ` Valdis.Kletnieks at vt.edu 0 siblings, 2 replies; 8+ messages in thread From: Madhu K @ 2016-09-22 11:16 UTC (permalink / raw) To: kernelnewbies Hi All, If i want to enable SMP, cores should be of same version( ex: both core should ARM 7 ) or we could enable SMP on different version. Thanks Madhu -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160922/66af957d/attachment.html ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-22 11:16 SMP on different cores Madhu K @ 2016-09-22 12:17 ` Greg KH 2016-09-22 13:04 ` Daniel. 2016-09-23 11:00 ` Madhu K 2016-09-22 14:29 ` Valdis.Kletnieks at vt.edu 1 sibling, 2 replies; 8+ messages in thread From: Greg KH @ 2016-09-22 12:17 UTC (permalink / raw) To: kernelnewbies On Thu, Sep 22, 2016 at 04:46:12PM +0530, Madhu K wrote: > Hi All, > > If i want to enable SMP, cores should be of same version( ex: both > core should ARM 7 ) or we could enable SMP on different version. Do you have a machine that has cores of different versions of a CPU? If so, what are they? thanks, greg k-h ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-22 12:17 ` Greg KH @ 2016-09-22 13:04 ` Daniel. 2016-09-22 13:05 ` Daniel. 2016-09-23 11:00 ` Madhu K 1 sibling, 1 reply; 8+ messages in thread From: Daniel. @ 2016-09-22 13:04 UTC (permalink / raw) To: kernelnewbies I know about i.MX6 which has Cortex-A7 + Cortex-M4... but I don't think that M4 is handled by Linux but by some RTOS 2016-09-22 9:17 GMT-03:00 Greg KH <greg@kroah.com>: > On Thu, Sep 22, 2016 at 04:46:12PM +0530, Madhu K wrote: >> Hi All, >> >> If i want to enable SMP, cores should be of same version( ex: both >> core should ARM 7 ) or we could enable SMP on different version. > > Do you have a machine that has cores of different versions of a CPU? If > so, what are they? > > thanks, > > greg k-h > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies at kernelnewbies.org > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- "Do or do not. There is no try" Yoda Master ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-22 13:04 ` Daniel. @ 2016-09-22 13:05 ` Daniel. 0 siblings, 0 replies; 8+ messages in thread From: Daniel. @ 2016-09-22 13:05 UTC (permalink / raw) To: kernelnewbies s/iMX6/iMX7/ 2016-09-22 10:04 GMT-03:00 Daniel. <danielhilst@gmail.com>: > I know about i.MX6 which has Cortex-A7 + Cortex-M4... but I don't > think that M4 is handled by Linux but by some RTOS > > 2016-09-22 9:17 GMT-03:00 Greg KH <greg@kroah.com>: >> On Thu, Sep 22, 2016 at 04:46:12PM +0530, Madhu K wrote: >>> Hi All, >>> >>> If i want to enable SMP, cores should be of same version( ex: both >>> core should ARM 7 ) or we could enable SMP on different version. >> >> Do you have a machine that has cores of different versions of a CPU? If >> so, what are they? >> >> thanks, >> >> greg k-h >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies at kernelnewbies.org >> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > -- > "Do or do not. There is no try" > Yoda Master -- "Do or do not. There is no try" Yoda Master ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-22 12:17 ` Greg KH 2016-09-22 13:04 ` Daniel. @ 2016-09-23 11:00 ` Madhu K 2016-09-23 12:00 ` Greg KH 2016-09-24 8:21 ` Greg Freemyer 1 sibling, 2 replies; 8+ messages in thread From: Madhu K @ 2016-09-23 11:00 UTC (permalink / raw) To: kernelnewbies Hi Greg k-h, Thanks a lot for your response. I want to understand how SMP works and what should be the requirements to enable SMP, This is to understand, whether is it possible to enable SMP on different cores. Right now I don't have a machine with different cores. Thanks Madhu On Thu, Sep 22, 2016 at 5:47 PM, Greg KH <greg@kroah.com> wrote: > On Thu, Sep 22, 2016 at 04:46:12PM +0530, Madhu K wrote: > > Hi All, > > > > If i want to enable SMP, cores should be of same version( ex: both > > core should ARM 7 ) or we could enable SMP on different version. > > Do you have a machine that has cores of different versions of a CPU? If > so, what are they? > > thanks, > > greg k-h > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160923/032d5901/attachment.html ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-23 11:00 ` Madhu K @ 2016-09-23 12:00 ` Greg KH 2016-09-24 8:21 ` Greg Freemyer 1 sibling, 0 replies; 8+ messages in thread From: Greg KH @ 2016-09-23 12:00 UTC (permalink / raw) To: kernelnewbies On Fri, Sep 23, 2016 at 04:30:58PM +0530, Madhu K wrote: > Hi Greg k-h, > > Thanks a lot for your response. > > I want to understand how SMP works and what should be the requirements to > enable SMP, This is to understand, whether is it possible to enable SMP on > different cores. Right now I don't have a machine with different cores. There is lots of documentation and information out there about SMP and how it works. I suggest doing a bit of research first, and if you have questions about the Linux implementation of such, we would be glad to help answer specific questions. good luck! greg k-h ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-23 11:00 ` Madhu K 2016-09-23 12:00 ` Greg KH @ 2016-09-24 8:21 ` Greg Freemyer 1 sibling, 0 replies; 8+ messages in thread From: Greg Freemyer @ 2016-09-24 8:21 UTC (permalink / raw) To: kernelnewbies On Fri, Sep 23, 2016 at 7:00 AM, Madhu K <madhu.sk89@gmail.com> wrote: > Hi Greg k-h, > > Thanks a lot for your response. > > I want to understand how SMP works and what should be the requirements to > enable SMP, This is to understand, whether is it possible to enable SMP on > different cores. Right now I don't have a machine with different cores. > > Thanks > Madhu > > On Thu, Sep 22, 2016 at 5:47 PM, Greg KH <greg@kroah.com> wrote: >> >> On Thu, Sep 22, 2016 at 04:46:12PM +0530, Madhu K wrote: >> > Hi All, >> > >> > If i want to enable SMP, cores should be of same version( ex: both >> > core should ARM 7 ) or we could enable SMP on different version. >> >> Do you have a machine that has cores of different versions of a CPU? If >> so, what are they? >> >> thanks, >> >> greg k-h Madhu, SMP requires a single computer with multiple cores. If and when you buy a computer with multiple cores, I encourage you to buy one where all the cores are the same. BTW: in both Arm and Intel, the lowest end multi-core CPU PCs use a single socket solution, so you have absolutely no option of having different architectures on that single socket. Greg (not KH) ^ permalink raw reply [flat|nested] 8+ messages in thread
* SMP on different cores. 2016-09-22 11:16 SMP on different cores Madhu K 2016-09-22 12:17 ` Greg KH @ 2016-09-22 14:29 ` Valdis.Kletnieks at vt.edu 1 sibling, 0 replies; 8+ messages in thread From: Valdis.Kletnieks at vt.edu @ 2016-09-22 14:29 UTC (permalink / raw) To: kernelnewbies On Thu, 22 Sep 2016 16:46:12 +0530, Madhu K said: > If i want to enable SMP, cores should be of same version( ex: both core > should ARM 7 ) or we could enable SMP on different version. There's kernel support for the bigLITTLE architecture in some ARM chips, but since it depends on being able to migrate execution streams between them, the various processors really *do* need to be compatible. You *really* don't want to try to make things work when some cores are ARM6 and some are ARM7, for instance - that way lies madness if you ever reschedule onto a different processor (and I'm not even sure our toolchains are able to generate a mixed-architecture binary without complaint). -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 484 bytes Desc: not available Url : http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160922/e06e0ad3/attachment-0001.bin ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2016-09-24 8:21 UTC | newest] Thread overview: 8+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2016-09-22 11:16 SMP on different cores Madhu K 2016-09-22 12:17 ` Greg KH 2016-09-22 13:04 ` Daniel. 2016-09-22 13:05 ` Daniel. 2016-09-23 11:00 ` Madhu K 2016-09-23 12:00 ` Greg KH 2016-09-24 8:21 ` Greg Freemyer 2016-09-22 14:29 ` Valdis.Kletnieks at vt.edu
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