Date: Tue, 12 Mar 2013 16:53:25 +0000 From: Max Brazhnikov <makc@freebsd.org> To: Kevin Oberman <rkoberman@gmail.com> Cc: freebsd-x11@freebsd.org, freebsd-usb@freebsd.org Subject: Re: high system load when using i915kms Message-ID: <1974063.Ti2gy7L6k6@mercury.ph.man.ac.uk> In-Reply-To: <CAN6yY1u%2BSi3YebRpkimTNda0CvWdZoYM5LrVT_VwySQaE1w0OA@mail.gmail.com> References: <2460779.xZBtdeG4eu@mercury.ph.man.ac.uk> <1382092.A6MSmtKV3F@mercury.ph.man.ac.uk> <CAN6yY1u%2BSi3YebRpkimTNda0CvWdZoYM5LrVT_VwySQaE1w0OA@mail.gmail.com>
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On Fri, 08 Mar 2013 11:38:13 -0800 Kevin Oberman wrote: > On Fri, Mar 8, 2013 at 10:03 AM, Max Brazhnikov <makc@freebsd.org> wrote: > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU > > COMMAND > > 11 root 2 155 ki31 0K 32K RUN 1 4:16 120.35% idle > > 12 root 18 -84 - 0K 288K WAIT 0 0:57 76.34% intr > > > > I've got this after second boot today, although I couldn't reproduce it > > yesterday even after ten attempts. But sometimes it's quite nasty and I > > have > > to reboot the system several times to get rid of it. > > > > Max > > > > So the issue is that that the interrupts from one or another of the USB > devices has exploded from near zero to around 40K when the kernel module is > loaded? Exactly. > A couple of possibly irrelevant questions. Do you normally manually load > the module? I did not research the issue, but when I manually load the > module I was seeing things just grind to a halt. If I started Gnome, the > module was loaded automatically by X, and things worked. No I don't usually load it manually, I was just wondering what causes the interrupt storm. > Why loading the Intel KMS module would cause a massive increase in > interrupts on a USB interface completely baffles me, but I suspect some > sort of race is going on when the module is pre-loaded. It happens if I allow X to load the module also, the problem is not due to pre-loading. Max
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