Dear Jan Kiszka: I re-enable ACPI_PROCESSOR in the kernel, but also the latency test seems no good,attached file is the new kernel config file. /*********************************************************************************************/RTT| 00:01:04 (periodic user-mode task, 100 us period, priority 99)RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worstRTD| 0.072| 0.785| 19.712| 2| 0| -0.177| 131.284RTD| 0.096| 2.280| 15.701| 2| 0| -0.177| 131.284RTD| 0.059| 1.573| 12.868| 2| 0| -0.177| 131.284RTD| 0.058| 2.512| 25.545| 2| 0| -0.177| 131.284RTD| 0.286| 1.928| 153.611| 3| 0| -0.177| 153.611RTD| 0.285| 2.834| 17.032| 3| 0| -0.177| 153.611RTD| 0.128| 2.104| 26.467| 3| 0| -0.177| 153.611RTD| 0.140| 1.105| 14.978| 3| 0| -0.177| 153.611RTD| 0.163| 0.950| 12.708| 3| 0| -0.177| 153.611RTD| 0.199| 1.012| 15.109| 3| 0| -0.177| 153.611RTD| 0.042| 1.007| 10.511| 3| 0| -0.177| 153.611RTD| 0.102| 0.763| 125.684| 4| 0| -0.177| 153.611RTD| 0.138| 0.810| 12.226| 4| 0| -0.177| 153.611RTD| 0.125| 1.312| 13.858| 4| 0| -0.177| 153.611RTD| 0.256| 0.854| 67.039| 4| 0| -0.177| 153.611RTD| 0.280| 0.841| 14.205| 4| 0| -0.177| 153.611RTD| 0.099| 0.631| 76.185| 4| 0| -0.177| 153.611RTD| 0.230| 0.953| 16.041| 4| 0| -0.177| 153.611RTD| 0.086| 0.985| 65.416| 4| 0| -0.177| 153.611RTD| 0.110| 0.856| 18.357| 4| 0| -0.177| 153.611/************************************************************************************/
-------------------------------- Best regards Kevin ----- 原始邮件 ----- 发件人：Jan Kiszka <[email protected]> 收件人：[email protected], xenomai <[email protected]> 主题：Re: Xenomai latency test not good 日期：2019年09月09日 17点46分 On 09.09.19 11:34, 鲁克文 via Xenomai wrote: > Dear Sir: > I have a Intel Atom J1900, using Ubuntu 16.04, Kernel version:4.9.24, patch > with xenomai 3.0.5, using ipipe-core-4.9.24-x86-2.patch. > When I start to run the latency test, I get this result(it is not > good):/******************************************************/RTT| 00:00:43 > (periodic user-mode task, 100 us period, priority 99)RTH|----lat min|----lat > avg|----lat max|-overrun|---msw|---lat best|--lat worstRTD| 0.192| > 0.621| 10.228| 5| 0| 0.070| 130.271RTD| 0.312| > 0.512| 116.038| 6| 0| 0.070| 130.271RTD| 0.311| > 0.513| 6.818| 6| 0| 0.070| 130.271RTD| 0.311| > 0.609| 13.132| 6| 0| 0.070| 130.271RTD| 0.178| > 0.643| 10.743| 6| 0| 0.070| 130.271RTD| 0.309| > 0.482| 4.416| 6| 0| 0.070| 130.271RTD| > 0.057| 0.549| 10.501| 6| 0| 0.057| 130.271RTD| > 0.297| 0.643| 16.239| 6| 0| 0.057| 130.271RTD| > 0.164| 0.683| 9.876| 6| 0| 0.057| 130.271RTD| > 0.308| 0.410| 2.888| 6| 0| 0.057| 130.271RTD| > 0.139| 0.474| 169.443| 7| 0| 0.057| 169.443RTD| > 0.318| 0.400| 2.924| 7| 0| 0.057| > 169.443RTD| 0.318| 0.442| 3.559| 7| 0| 0.057| > 169.443RTD| 0.137| 0.434| 3.379| 7| 0| 0.057| > 169.443RTD| 0.316| 0.465| 125.119| 8| 0| 0.057| > 169.443RTD| 0.316| 0.410| 5.106| 8| 0| > 0.057| 169.443RTD| 0.231| 0.477| 3.953| 8| 0| > 0.057| 169.443RTD| 0.303| 0.549| 5.225| 8| 0| > 0.057| 169.443RTD| 0.279| 0.443| 6.689| 8| 0| > 0.057| 169.443RTD| 0.218| 0.428| 6.521| 8| 0| > 0.057| 169.443RTD| 0.109| 0.468| 122.246| 9| 0| > 0.057| > 169.443/*****************************************************************************/ Your email client mangled the linefeeds. > For the Intel X86 SMI thing,here is my system setting(could not be > disabled):/**********************************************************************************/root@googol:/home/googol# > dmesg |grep -i xenomai[ 0.000000] Kernel command line: > BOOT_IMAGE=/vmlinuz-4.9.24 root=UUID=ba9a8ea7-08a9-4772-9744-da7b70a9360f ro > quiet splash vt.handoff=7 xenomai.smi=enabled[ 1.694624] [Xenomai] > scheduling class idle registered.[ 1.694626] [Xenomai] scheduling class rt > registered.[ 1.694670] [Xenomai] SMI-enabled chipset found[ 1.694688] > [Xenomai] SMI workaround failed![ 1.694731] I-pipe: head domain Xenomai > registered.[ 1.695859] [Xenomai] Cobalt v3.0.5 (Sisyphus's Boulder) > /**************************************************************************************/ > The attached file is my kernel config file.According to the testing result, > it seems that the system has large latency, so it is not good when doing > realtime control.Could you help me to improve its realtime behavior, or guide > me how to improve it? You may have to re-enable ACPI_PROCESSOR, even if Xenomai warns about this. I've seen cases where disabling it triggered the firmware to throttle the CPU and cause such high latencies. Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux -------------- next part -------------- A non-text attachment was scrubbed... Name: .config Type: application/xml Size: 200369 bytes Desc: not available URL: <http://xenomai.org/pipermail/xenomai/attachments/20190909/df057a8c/attachment.wsdl>
