Date: Mon, 23 Jan 2006 22:53:54 +0100 From: Tobias Roth <roth@iam.unibe.ch> To: Kris Kennaway <kris@obsecurity.org> Cc: stable@freebsd.org, glebius@freebsd.org Subject: Re: system laggy under load, SCHED_BSD Message-ID: <20060123215354.GA7996@droopy.unibe.ch> In-Reply-To: <20060122222532.GA62073@xor.obsecurity.org> References: <20060122220028.GB1379@droopy.unibe.ch> <20060122222532.GA62073@xor.obsecurity.org>
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On Sun, Jan 22, 2006 at 05:25:33PM -0500, Kris Kennaway wrote: > On Sun, Jan 22, 2006 at 11:00:28PM +0100, Tobias Roth wrote: > > Hi > > > > Since some time, I experience extremely bad system behaviour under > > load. For instance when compiling something, or unpacking a large > > archive, the system is almost unusable, even the mouse pointer > > reacts sloppy. > > > > My system: > > > > 6.0-STABLE FreeBSD 6.0-STABLE #7: Sun Jan 22 15:53:39 CET 2006 i386 > > > > I use SCHED_BSD. > > > > How can I diagnose the problem, or provide more information? What > > factors might influence what I experience? I cannot give a more precise > > point in time as when this started, since I switched versions and > > systems a few times recently. > > This has been discussed a number of times: the short answer is to look > for interrupt storms (vmstat -i), interrupt sharing (also vmstat -i), > and in particular shared interrupts involving usb or other drivers > still under Giant. Nothing out of the ordinary, when looking at those interrupts. However, turning on DMA for the harddisk made the mouse pointer sloppyness go away. Now hand me that pointy hat and let me sit in some dark corner... Thanks, Tobias
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