In my BIOS-setup there is an option "PCI latency" which defaults to
32. First I changed it to 128. That worked perfect. Later I have decreased
it to 64, 48 and 40. But 40 still gave some problems (a little bit
distortion of my sound). After that I tried 44, but the disk was to slow
with this setting (30 MB/s instead of 40 MB/s). So now I have a PCI
latency of 48. The strange thing is that it seems not to work
directly. After the system boot when I do hdparm -t, I get about 5
MB/s. But then when I switch using_dma off and on again using hdparm, I
get the full 40 MB/s and no distortion of my es1371. Any ideas what might
cause this?
Regards,
Edward
---------- Forwarded message ----------
Date: Tue, 1 Jan 2002 18:14:41 +0100
From: Vojtech Pavlik <vojtech@suse.cz>
To: Edward Stempel <eazstempel@cal009001.student.utwente.nl>
Cc: linux-kernel mailinglist <linux-kernel@vger.kernel.org>
Subject: Re: DMA conflicts with soundcard for ide driver via82cxxx
On Fri, Dec 28, 2001 at 05:10:43PM +0100, Edward Stempel wrote:
> Excellent! That solved my problem.
What exactly did you have to change? It might be worth to include the
changing of the latency setting in the kernel.
>
> Thankx
>
> Edward
>
>
>
>
> Date: Fri, 28 Dec 2001 10:15:05 +0100
> From: Vojtech Pavlik <vojtech@suse.cz>
> To: Edward Stempel <eazstempel@cal009001.student.utwente.nl>
> Cc: linux-kernel mailinglist <linux-kernel@vger.kernel.org>
> Subject: Re: DMA conflicts with soundcard for ide driver via82cxxx
>
> On Fri, Dec 28, 2001 at 03:32:34AM +0100, Edward Stempel wrote:
>
> > I have an Asus a7v266 mother board and an Ensoniq sound card in it.
> > The ide chipset is a VIA VT8233 that is capable of UDMA100. So I built a
> > kernel with the es1371 sound driver and the via82cxxx ide driver
> > configured in it. Actually I tried the kernel 2.4.17 first, and the latest
> > I tried is 4.5.1 with the latest patch (patch-2.5.2-pre3) applied to it.
> > I also tried the kernel 2.5.1 with Vojtech patch (via-3.33.diff from
> > his email dated 2001-12-23 23:20:48) applied to it, with the same
> > (negative) results.
> >
> > The good thing is that hdparm reports appr. 40 MB/sec when using DMA and
> > about 6 MB/sec when not using DMA.
> > Unfortunately using DMA for ide results in some ugly distortion of the
> > sound from my soundcard whenever some IO to the disk is done. :((
> >
> > I have assigned different interrupts to the PCI-cards (ide is
> > on-board) and I even changed the sound card's PCI slot, so it shared
> > its interrupt with another device (acpi instead of USB). It did not solve
> > the problem. Because the problem only occurs when switching on using_dma
> > on the ide driver, I think it is a DMA problem with the ide driver. It may
> > be the es1371 driver as well off course, but I suspect it is the ide
> > driver (or chipset).
> >
> > Reading the list archive from linux-kernel, I discovered there have been
> > more problems with DMA using this chipset, but I did not find anyone
> > having the same problem as I have now.
> >
> > Has someone also dealt with these problems, or can someone help me
> > solving this problem? Please help!
> >
> > Below are some outputs using kernel 5.1 with patch-2.5.2-pre3.
>
> You may try changing the PCI latency settings on either the IDE
> controller or the sound card. Other than that, I don't know how to help.
>
> --
> Vojtech Pavlik
> SuSE Labs
-- Vojtech Pavlik SuSE Labs- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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