Date: Sun, 25 Apr 2004 13:34:34 +0000 From: "Atte Peltomaki" <koston@iki.fi> To: freebsd-current@freebsd.org Subject: Re: SMP weirdness in -CURRENT Message-ID: <20040425133434.GA67708@norsu.kameli.org> In-Reply-To: <20040424114043.GA25392@norsu.kameli.org> References: <200404201311.i3KDBY7C071099@anduin.net> <20040424114043.GA25392@norsu.kameli.org>
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> > So.. What's going on? Am I the only one who notices these things? I have a feeling this only happens when the system load is high, not when the user load is high. And the funny thing is - my openoffice build (in this case) is running with nice -n 10, so even its priority is low. > > > Is this related to SCHED_ULE, should I try with SCHED_BSD? I thought the real strengths of SCHED_ULE only shows on SMP, am I wrong? > > I have been experiencing same symptoms you described on two of my SMP > boxes, long time now. And I'm really going to get to the bottom of > this, tried switching NIC's, audio cards, UP kernel, with and without > ACPI.. I'll let you know when I come up with something useful. > > At least the symptoms surface a lot worse when all the -current kernel > debugging options are turned on (=more system cpu load) Allright, removing all debugging stuffs made things pretty good. With the debug symbols, cpu system load was constantly around 15%. Now, If I load the CPU a lot, like make -j10 buildworld, cpu loads are between 50% and 100% all the time, but music plays just fine without any kind of lag. But If I do something that puts system cpu load even over 30%, things get very jerky. No matter if the loading process is niced to 20 and xmms (or whatevery player) is niced -20. Atte Peltomaki http://kameli.org
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