Re: Losing interrupts
From: Andrew Morton (akpm_at_osdl.org)
Date: 07/15/04
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Date: Thu, 15 Jul 2004 14:04:58 -0700 To: Lee Revell <rlrevell@joe-job.com>
Lee Revell <rlrevell@joe-job.com> wrote:
>
> There was an issue several years ago where Matrox figured out they could
> get slightly better benchmark scores by not checking whether a FIFO on
> the video card was full before writing to it, which would cause the PCI
> bus to completely freeze until the FIFO had drained. Lots of vendors
> followed suit until one of the audio software vendors figred it out and
> called them on it, at which point they fixed their drivers. The effects
> (massive audio drouputs) and the steps to reproduce (drag a window
> around the screen slowly) were identical.
There's an XF86Config incantation which is supposed to prevent this: if you
set it, the driver will poll the FIFO-full bit before actually reading the
FIFO.
hm, according to http://www.xfree86.org/3.3.6/3DLabs3.html, the pci_retry
option _causes_ the bad behaviour, rather than avoiding it.
Oh, well. Have a play with that.
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