2012/4/23 Philippe Gerum <r...@xenomai.org>: > On 04/23/2012 03:51 AM, Willy Lambert wrote: >> >> Hi, >> >> I have a message in dmesg about SMI workaround : >> Xenomai: SMI-enabled chipset found, but SMI workaround disabled >> (check CONFIG_XENO_HW_SMI_WORKAROUND). You may encounter >> high interrupt latencies! >> >> My kernel should be configured properly and following the "In case of >> high latencies" of >> http://www.xenomai.org/index.php/Configuring_x86_kernels thread, I did >> some tests. >> >> Latency test is here (if it is us it should be ok no ?): >> > > Yes, this looks ok, but you need to run this test longer, and try a few > usual suspects like plugging in/out USB devices while doing so (e.g. mouse, > netdev). > > The point of this message is to tell you that your chipset is known to > create latency issues in some cases (like most Intel chipset these days), > but you did not enable the Xenomai code which works around such issues by > shutting down problematic SMI sources. That may be right, or even required > to leave all the SMI sources enabled (e.g. thermal control), but this might > also lead to unacceptable latency spots. YMMV. > > This is basically a heads up message. > > -- > Philippe.
Ok, thanks for answers. I did the test again , playing with usb and using the stress program to generate CPU load. The max latency for now is 15us in 4 mins. So I think it will be ok to keep SMI on for the time. Please let me know if this test is still stoo short. ^C---|-----------|-----------|-----------|--------|------|------------------------- RTS| 0.604| 2.332| 15.161| 0| 0| 00:03:59/00:03:59 Do you know by chance where I can found infos about SMI sources ? I suppose it is not in the ICH8M docs, it would be in my board doc ? Or have I a soft way to do this check so that I don't have to spend time with my vendor which will obviously have hard time to answer that ? _______________________________________________ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
