Date: Thu, 15 Jan 2009 17:38:43 -0500 (EST) From: Daniel Eischen <deischen@freebsd.org> To: Pramod Srinivasan <pramod@juniper.net> Cc: freebsd-threads@freebsd.org Subject: Re: Priority scheduling in 6.x Message-ID: <Pine.GSO.4.64.0901151736190.3533@sea.ntplx.net> In-Reply-To: <C594F65D.5677C%pramod@juniper.net> References: <C594F65D.5677C%pramod@juniper.net>
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On Thu, 15 Jan 2009, Pramod Srinivasan wrote: > Hi Daniel > > Thanks for your response. > > On 1/14/09 7:25 PM, "Daniel Eischen" <deischen@freebsd.org> wrote: > >> On Wed, 14 Jan 2009, Pramod Srinivasan wrote: >> >>> Hi, >>> >>> I have 3 threads low, medium and high , and the scheduling policy is set to >>> SCHED_FIFO. The priority of the threads are at 28,29,30 respectively. Looks >>> like on FreeBSD 6.x, the priority of the threads are not honored while >>> scheduling the threads, but the same test on FreeBSD 7.x seems to work fine. >>> Are there known issues with the priority scheduling in FreeBSD 6.x or am I >>> doing something wrong? (I am using libthr) >> >> Are you using libpthread or libthr on 6.3? > > I am using libthr on 6.1, but had similar issues on 6.2 as well. > >> >> If you are using libthr, then you need to be running with >> superuser privileges for SCHED_FIFO to work. I'm not sure >> if this works correctly at all in 6.3. > > I am running the program with super user privileges on 6.1, tried this on > 6.2 as well. Priority scheduling using libthr does not work, unless I am > missing something very basic?. The same program works fine on 7.1, any > ideas? I'm not sure what kernel scheduler you are using (ULE or BSD), but you can try switching it. Other than that, it probably just won't ever work correctly on 6.x. -- DE
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