* [Xenomai] Fwd: SMI problems with 2.6.2.1 and last weekends git version [not found] <CAN0BPY_SzMoNrgOF2fBwrMA=7scopqTKPC+pxkk12wtGMsWdGQ@mail.gmail.com> @ 2013-05-31 10:00 ` John Candlish 2013-05-31 11:20 ` Gilles Chanteperdrix 0 siblings, 1 reply; 4+ messages in thread From: John Candlish @ 2013-05-31 10:00 UTC (permalink / raw) To: xenomai Resent, because it bounced the first time. ---------- Forwarded message ---------- From: John Candlish <john.candlish@gmail.com> Date: Tue, May 28, 2013 at 9:08 PM Subject: SMI problems with 2.6.2.1 and last weekends git version To: xenomai@xenomai.org Hello This was originally about linuxCNC, but was reminded to post my SMI findings here. from the emc-developers list: http://thread.gmane.org/gmane.linux.distributions.emc.devel/9863 <quote> What I found out about RTAI and Xenomai? Xenomai 2.6.2.1 stable or GIT do not handle SMI masking correctly for my ICH7 chipsets. In the case of the stable download the chipset is detected but the SMI workaround fails to apply. --- May 25 07:42:05 sixis kernel: Xenomai: real-time nucleus v2.6.2.1 (Day At The Beach) loaded. May 25 07:42:05 sixis kernel: Xenomai: debug mode enabled. May 25 07:42:05 sixis kernel: Xenomai: SMI-enabled chipset found May 25 07:42:05 sixis kernel: Xenomai: SMI workaround failed! --- In the case of the GIT version the kernel command line parameter 'xeno_hal.smi=1' is not respected. --- May 26 08:31:48 sixis kernel: Xenomai: real-time nucleus v2.6.2.1 (Day At The Beach) loaded. May 26 08:31:48 sixis kernel: Xenomai: debug mode enabled. May 26 08:31:48 sixis kernel: Xenomai: SMI-enabled chipset found, but SMI workaround disabled May 26 08:31:48 sixis kernel: (see xeno_hal.smi parameter). You may encounter May 26 08:31:48 sixis kernel: high interrupt latencies! --- I was seeing latency as high as 100us with Xenomai, so it is currently not working for me. </quote> This is on a Dell gx620, Pentium D 820, ICH7 chipset machine. I could do more testing if it is a help. I would very much like to get Xenomai working for me, but both the stable version or the git version have SMI problems. Thanksyou jCandlish . ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Xenomai] Fwd: SMI problems with 2.6.2.1 and last weekends git version 2013-05-31 10:00 ` [Xenomai] Fwd: SMI problems with 2.6.2.1 and last weekends git version John Candlish @ 2013-05-31 11:20 ` Gilles Chanteperdrix 2013-05-31 14:03 ` [Xenomai] Fwd: " John Candlish 0 siblings, 1 reply; 4+ messages in thread From: Gilles Chanteperdrix @ 2013-05-31 11:20 UTC (permalink / raw) To: John Candlish; +Cc: xenomai On 05/31/2013 12:00 PM, John Candlish wrote: > Resent, because it bounced the first time. > > ---------- Forwarded message ---------- > From: John Candlish <john.candlish@gmail.com> > Date: Tue, May 28, 2013 at 9:08 PM > Subject: SMI problems with 2.6.2.1 and last weekends git version > To: xenomai@xenomai.org > > > Hello > > This was originally about linuxCNC, but was reminded to post my SMI > findings here. > > from the emc-developers list: > http://thread.gmane.org/gmane.linux.distributions.emc.devel/9863 > > <quote> > > What I found out about RTAI and Xenomai? > > Xenomai 2.6.2.1 stable or GIT do not handle SMI masking correctly for my > ICH7 chipsets. In the case of the stable download the chipset is detected > but the SMI workaround fails to apply. > > --- > May 25 07:42:05 sixis kernel: Xenomai: real-time nucleus v2.6.2.1 (Day At > The Beach) loaded. > May 25 07:42:05 sixis kernel: Xenomai: debug mode enabled. > May 25 07:42:05 sixis kernel: Xenomai: SMI-enabled chipset found > May 25 07:42:05 sixis kernel: Xenomai: SMI workaround failed! This usually means that your BIOS vendor disabled the "global SMI" bit, there is not much Xenomai can do about that. You may try other bits, though, maybe that works (I never tried actuallly, because I never had a computer where accessing the global SMI bit failed). > --- > > In the case of the GIT version the kernel command line parameter > 'xeno_hal.smi=1' is not respected. Makefile bug, this should be fixed now. But it will probably not change the fact that your BIOS vendor may prevent you from writing to the SMI disable bit. -- Gilles. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Xenomai] Fwd: Fwd: SMI problems with 2.6.2.1 and last weekends git version 2013-05-31 11:20 ` Gilles Chanteperdrix @ 2013-05-31 14:03 ` John Candlish 2013-05-31 20:16 ` Gilles Chanteperdrix 0 siblings, 1 reply; 4+ messages in thread From: John Candlish @ 2013-05-31 14:03 UTC (permalink / raw) To: xenomai Thank you for you timely reply. I'll check again with another of the same computer+bios as well as a core2 ICH7 machine. I should mention that the particular machine tested does respond to the rtai_smi.ko module, in that the presence of that module significantly reduces (eliminates actually) the periodic smi latencies. It is curious. I'll look again. Thanks jCandlish . ---------- Forwarded message ---------- From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> Date: Fri, May 31, 2013 at 1:20 PM Subject: Re: [Xenomai] Fwd: SMI problems with 2.6.2.1 and last weekends git version To: John Candlish <john.candlish@gmail.com> Cc: xenomai@xenomai.org On 05/31/2013 12:00 PM, John Candlish wrote: > Resent, because it bounced the first time. > > ---------- Forwarded message ---------- > From: John Candlish <john.candlish@gmail.com> > Date: Tue, May 28, 2013 at 9:08 PM > Subject: SMI problems with 2.6.2.1 and last weekends git version > To: xenomai@xenomai.org > > > Hello > > This was originally about linuxCNC, but was reminded to post my SMI > findings here. > > from the emc-developers list: > http://thread.gmane.org/gmane.linux.distributions.emc.devel/9863 > > <quote> > > What I found out about RTAI and Xenomai? > > Xenomai 2.6.2.1 stable or GIT do not handle SMI masking correctly for my > ICH7 chipsets. In the case of the stable download the chipset is detected > but the SMI workaround fails to apply. > > --- > May 25 07:42:05 sixis kernel: Xenomai: real-time nucleus v2.6.2.1 (Day At > The Beach) loaded. > May 25 07:42:05 sixis kernel: Xenomai: debug mode enabled. > May 25 07:42:05 sixis kernel: Xenomai: SMI-enabled chipset found > May 25 07:42:05 sixis kernel: Xenomai: SMI workaround failed! This usually means that your BIOS vendor disabled the "global SMI" bit, there is not much Xenomai can do about that. You may try other bits, though, maybe that works (I never tried actuallly, because I never had a computer where accessing the global SMI bit failed). > --- > > In the case of the GIT version the kernel command line parameter > 'xeno_hal.smi=1' is not respected. Makefile bug, this should be fixed now. But it will probably not change the fact that your BIOS vendor may prevent you from writing to the SMI disable bit. -- Gilles. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Xenomai] Fwd: Fwd: SMI problems with 2.6.2.1 and last weekends git version 2013-05-31 14:03 ` [Xenomai] Fwd: " John Candlish @ 2013-05-31 20:16 ` Gilles Chanteperdrix 0 siblings, 0 replies; 4+ messages in thread From: Gilles Chanteperdrix @ 2013-05-31 20:16 UTC (permalink / raw) To: John Candlish; +Cc: xenomai On 05/31/2013 04:03 PM, John Candlish wrote: > Thank you for you timely reply. I'll check again with another of the same > computer+bios as well as a core2 ICH7 machine. > > I should mention that the particular machine tested does respond to the > rtai_smi.ko module, in that the presence of that module significantly > reduces (eliminates actually) the periodic smi latencies. > > It is curious. I'll look again. Well, the RTAI module does not check if clearing the SMI bit actually work, this was added later in Xenomai. So, I would say the result is the same, only you do not see it. Another difference is that the RTAI module does not do the "pci_device_put" right away, which prevents loading other kernel modules which would like to request the LPC PCI device. I doubt that could make a difference though. -- Gilles. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-05-31 20:16 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <CAN0BPY_SzMoNrgOF2fBwrMA=7scopqTKPC+pxkk12wtGMsWdGQ@mail.gmail.com> 2013-05-31 10:00 ` [Xenomai] Fwd: SMI problems with 2.6.2.1 and last weekends git version John Candlish 2013-05-31 11:20 ` Gilles Chanteperdrix 2013-05-31 14:03 ` [Xenomai] Fwd: " John Candlish 2013-05-31 20:16 ` Gilles Chanteperdrix
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