On Mon, Oct 06, 2008 at 10:21:01PM +0200, Wojciech Puchar wrote: > is it possible on FreeBSD
No, I think. > i run asterisk with realtime priority. it works perfectly no matter how > much CPU is loaded by other non-telephony tasks. > > but with lots of VM pressure it starts to so... like like tha..that... > > what causes it to behave like that and how to fix it. Well, basically you are the only one who can answer that. And that's not a paradox or an attempt at humor. You should investigate. Maybe interrupts aren't processed fast enough (hardware sharing an interrupt?), or memory or kernel resources are low. > for example when lots of spam comes to server and lots of resource hungry > spamassassin processes are spawned our calls starts to be crappy. > > CPU load for asterisk rarely exceed few percent! Yes, but FreeBSD isn't a _hard_ real-time OS (see below). > i think having separate computer just for this is stupid, i would do this > having no other choice, but can it be done without this. > > realtime priority is realtime priority anyway - it should work. It does depend what you mean by real-time. Usually real-time systems are devided into the "soft" and "hard" categories. See the Wikipedia article on real-time computing [http://en.wikipedia.org/wiki/Real-time_computing] and operating systems [http://en.wikipedia.org/wiki/Real-time_operating_system]. Most hard real-time systems are embedded systems with a specific function (say, ECU, FADEC, ABS, digital music player). I don't think there are general use OS's which would classify as hard real-time (AFAIK, RTLinux runs Linux as a low-priority task on a real-time core). Most of them support soft real-time, as in "we'll try to get these tasks done before a specific deadline, but no promises." Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
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