Audet, Jean-Michel wrote: > Open IPMI does check that and use it when available. > > If your KCS transaction time is less than 20ms, open ipmi use it. > > Otherwise, use make menuconfig to select the high resolution timer, after > rebuild your kernel. > High-res timers only works in the MontaVista kernel, AFAIK, unless other distros have pulled in the high-res timer patch.
In newer kernels, there is a polling daemon which improves the performance without interrupts at the expense of, well, polling. If you have interrupts, this daemon is not necessary and is disables. Interrupts are preferable from a CPU use point of view, but with a newer kernel will not make any difference in performance. -Corey > JM > > -----Message d'origine----- > De : Andrzej Niemcewicz [mailto:[EMAIL PROTECTED] > Envoyé : Tuesday, December 05, 2006 10:31 AM > À : Audet, Jean-Michel > Cc : David A. Ranch; ipmitool-devel > Objet : Re: [Ipmitool-devel] KCS with interrupts > > How can I check if high resolution timer is available in my system? > > Andrzej > > Dnia 5-12-2006 o godz. 14:52 Audet Jean-Michel napisał(a): > >> It is for KCS transaction speed. >> >> Today, with the latest kernel and new timers with better resolution, the >> difference is not very big between an implementation in interrupt or in >> polling. >> >> When no high resolution timer was available, the KCS speed was at least >> 20 times slower than now. A transaction that is now taking 5ms to 10ms >> was taking 200ms before. >> >> Jean-Michel Audet >> >> -----Message d'origine----- >> De : [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] De la part de >> David A. Ranch >> EnvoyĂŠÂ : Monday, December 04, 2006 9:37 PM >> Ă : ipmitool-devel >> Objet : Re: [Ipmitool-devel] KCS with interrupts >> >> >> Curious, what's the benefit of an interrupt-based IPMI setup? Better >> response for things like traps, SOL, etc. compared to polling? As it >> stands, the dmidecode for these Supermicro cards doesn't say anything >> about interrupts: >> >> ... >> Handle 0x0030 >> DMI type 38, 12 bytes. >> IPMI Device Information >> >> [that's it for IPMI] >> >> --Davod >> >> >>> Hi, >>> Was anyone able to enable interrupts on KCS interface (Open IPMI >>> >> driver)? >> >>> When I send: >>> modprobe ipmi_si type=kcs irqs=9 >>> >>> after 'dmesg |grep ipmi' I get: >>> ipmi message handler version 33.11 >>> ipmi_si: Found SMBIOS-specified state machine at I/O address 0xca2, >>> >> slave addres >> >>> s 0x20 >>> >>> and 'cat /proc/ipmi/0/si_stats' shows: >>> interrupts_enabled: 0 >>> >>> Regards, >>> Andrzej >>> >>> ---------------------------------------------------- >>> Komedia dla całej rodziny - "Wpuszczony w kanał" - nowa, rewelacyjna >>> animacja twórców "Shreka" i "Madagaskaru" w kinach od 1 grudnia! >>> >>> >> http://klik.wp.pl/?adr=http%3A%2F%2Fadv.reklama.wp.pl%2Fas%2Fwkanal.html&sid=957 >> >>> >>> >>> >> ------------------------------------------------------------------------- >> >>> Take Surveys. Earn Cash. Influence the Future of IT >>> Join SourceForge.net's Techsay panel and you'll get the chance to >>> >> share your >> >>> opinions on IT & business topics through brief surveys - and earn cash >>> >>> >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> >>> _______________________________________________ >>> Ipmitool-devel mailing list >>> Ipmitool-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/ipmitool-devel >>> >>> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share >> your >> opinions on IT & business topics through brief surveys - and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> _______________________________________________ >> Ipmitool-devel mailing list >> Ipmitool-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/ipmitool-devel >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share >> your >> opinions on IT & business topics through brief surveys - and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> _______________________________________________ >> Ipmitool-devel mailing list >> Ipmitool-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/ipmitool-devel >> >> > > ---------------------------------------------------- > 2016 stron, 5000 ilustracji, 321 map i ponad 120 tys. definicji! > Encyklopedia Powszechna Larousse - Idealny prezent gwiazdkowy > nie tylko dla uczniów! Zobacz najbardziej popularną encyklopedię: > http://klik.wp.pl/?adr=http%3A%2F%2Fadv.reklama.wp.pl%2Fas%2Fd49.html&sid=955 > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Ipmitool-devel mailing list > Ipmitool-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ipmitool-devel > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Ipmitool-devel mailing list Ipmitool-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ipmitool-devel
