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Date:      Wed, 11 Feb 2004 16:19:39 +0100
From:      "Petr Holub" <hopet@ics.muni.cz>
To:        "Dag-Erling Smrrgrav" <des@des.no>
Cc:        current@freebsd.org
Subject:   RE: storm of stray interrupts
Message-ID:  <02c001c3f0b2$77934150$2136fb93@kloboucek>
In-Reply-To: <xzp65edbqoj.fsf@dwp.des.no>

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> hmm, drm0 doesn't show up in your vmstat output...  does it normally
> show up on irq 16 when you use it?

drm0 say it allocates irq 11 when starting up:
drm0: <Matrox G550 (AGP)> mem
0xfd000000-0xfd7fffff,0xfdefc000-0xfdefffff,0xf8000000-0xf9ffffff irq 11 at
device 0.0 on pci1
info: [drm] AGP at 0xf0000000 128MB
info: [drm] Initialized mga 3.1.0 20021029 on minor 0
drm0: [MPSAFE]

When I unload the firewire module I get

-su-2.05b# vmstat -i
interrupt                          total       rate
irq1: atkbd0                       14670          0
irq6: fdc0                             4          0
irq8: rtc                       20292380        128
irq12: psm0                       106557          0
irq13: npx0                            1          0
stray irq13                            1          0
irq14: ata0                       117802          0
irq15: ata1                           30          0
irq16: fwohci0                 430097959       2712
stray irq16                            1          0
irq17: pcm0                       548028          3
irq18: bktr0                      428987          2
irq19: uhci0 bktr1                   987          0
irq20: em0                       1301800          8
irq0: clk                      158552995       1000
Total                          611462202       3857

=> no drm0 appears either. But there is no problem with interrupt
storm, glxgears are happy, and there is no excessive time spent in
interrupts according to both top and 'systat -vmstat 1' (something
beteen 0.1 to 0.4%).

> can you try moving the graphics adapter to a different PCI slot?

No. It's AGP Matrox G550 and there is the only AGP slot.

Petr


================================================================
                            Petr Holub
CESNET z.s.p.o.                       Supercomputing Center Brno
Zikova 4                             Institute of Compt. Science
162 00 Praha 6, CZ                            Masaryk University
Czech Republic                     Botanicka 68a, 60200 Brno, CZ
e-mail: Petr.Holub@cesnet.cz               phone: +420-549493944
                                             fax: +420-541212747
                                       e-mail: hopet@ics.muni.cz




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