Re: Interrupt stom on cardbus device

By stuttering I mean that animated gears stop, and FPS count is greatly
reduced 900FPS->20FPS
However, in real 3D accelerated apliccations FPS count is the same as
before, so I'm happy.

best regards, 
-Jakub Lach
 

Robert Noland wrote:
> 
> On Sun, 2009-03-01 at 01:15 -0800, Jakub Lach wrote:
>> Hello.
>> 
>> I also had such problems with interrupt storm _at_ IRQ 16. Hardware is
>> Lenovo
>> T400 (X4500,GM45) Patch greatly helped, although it  introduces other
>> problem. As long as output from glxgears is at ttyv0, it is working fine.
>> I
>> output is _at_ xterm window, it stutters while writing the FPS count. If
>> output
>> is at ttyv0 and I switch terminal from X11 to ttyv0 while glxgears is
>> working glxgears stutters too. 
> 
> Ok, I can try to look into this at some point, but right now it is not
> high priority.  When you VT switch, the irq handler gets uninstalled,
> and the vblank counters get reset in hardware.  We attempt to deal with
> that case, but it's not optimal.  As for stutter when printing while in
> X, it could be text rendering performance ( which kinda sucks right now,
> at least on intel ), it could also be that the G45 handles vblank
> counters differently.
> 
> But I'm glad that the patch resolved the interrupt storm.  It's likely
> that it will help other devices than graphics cards as well...
> 
> robert.
> 
>> dmesg
>> 
>> drm0: <Mobile IntelÂŽ GM45 Express Chipset> on vgapci0
>> info: [drm] MSI enabled 1 message(s)
>> vgapci0: child drm0 requested pci_enable_busmaster
>> info: [drm] AGP at 0xd0000000 256MB
>> info: [drm] Initialized i915 1.6.0 20080730
>> drm0: [ITHREAD]
>> error: [drm:pid26643:gm45_get_vblank_counter] *ERROR* trying to get
>> vblank
>> count for disabled pipe 0
>> drm0: [ITHREAD]
>> drm0: [ITHREAD]
>> drm0: [ITHREAD]
>> 
>> best regards, 
>> Jakub Lach
> -- 
> Robert Noland <rnoland_at_FreeBSD.org>
> FreeBSD
> 
>  
> 

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