Date: Tue, 26 Aug 2008 10:00:09 +1000 From: Andrew Reilly <andrew-freebsd@areilly.bpc-users.org> To: Jeff Roberson <jroberson@jroberson.net> Cc: freebsd-multimedia@freebsd.org, freebsd-arch@freebsd.org Subject: Re: SCHED_ULE problem: slow single processor, realtime prio vs network stack Message-ID: <20080826000009.GA77044@duncan.reilly.home> In-Reply-To: <20080820214627.C30593@desktop> References: <20080819025019.GA27997@duncan.reilly.home> <20080818215813.H952@desktop> <20080819134005.GA85664@duncan.reilly.home> <20080820214627.C30593@desktop>
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Hi Jeff, Sorry for the slow follow-up. It's actually quite a pain to tweak the kernel on that machine: it's often in use and it's slow at compiling kernels. Will see if I can get on to it soon. On Wed, Aug 20, 2008 at 09:47:01PM -1000, Jeff Roberson wrote: > On Tue, 19 Aug 2008, Andrew Reilly wrote: > > >On Mon, Aug 18, 2008 at 10:00:12PM -1000, Jeff Roberson wrote: > >>Can you tell me what % cpu the audio application uses while running? Have > >>you tried nice -20 instead of rtprio? > > > >It's currently using about 10%, maybe a bit more. I expect > >it to get heavier as I add more to it. I have hopes of it > >continuing to work even at 60 to 80% of CPU. > > > >I haven't tried nice -20 because I don't want the priority to > >drift or change, which is something that I thought the normal > >levels did. I'll give it a go though, and report back. > > With such a low cpu utilization I wouldn't expect it's the scheduling > algorithm. It may be a difference in preemption settings. Is preemption > enabled in both kernels? Yes, all of the premption and POSIX realtime options (that are usually on, aren't they?) are on in each case. Only difference is selection of scheduler: (This is the whole config file) include GENERIC ident GURNEY nocpu I486_CPU nocpu I586_CPU nooptions SCHED_ULE options SCHED_4BSD Cheers, Andrew
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