Messages in this thread | | | Date | Sat, 5 Jan 2002 18:19:42 +0100 | From | Vojtech Pavlik <> | Subject | Re: DMA conflicts with soundcard for ide driver via82cxxx |
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On Sat, Jan 05, 2002 at 06:03:59PM +0100, Edward Stempel wrote: > On Sat, 5 Jan 2002, Vojtech Pavlik wrote: > > > On Sat, Jan 05, 2002 at 05:17:28PM +0100, Edward Stempel wrote: > > > On Tue, 1 Jan 2002, Vojtech Pavlik wrote: > > > > > > > On Tue, Jan 01, 2002 at 11:03:52PM +0100, Edward Stempel wrote: > > > > > 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? > > > > > > > > You'd have to tell me all other settings in your setup first so I can > > > > guess the cause. What options do you use? Is DMA enabled automatically? > > > > Etc, etc ... > > > > > > I am not sure which settings you need. But I compiled a kernel with: > > > - Generic PCI IDE chipset support > > > - Sharing PCI IDE interrupt support > > > - Generic PCI bus-master DMA support > > > - Use PCI DMA by default when available > > > - VIA82CXXX chipset support > > > > > > After booting this kernel hdparm -v reports that I am using dma, but > > > hdparm -t only reports about 5 MB/s data transfer rate. When I switch the > > > using of dma off and on with hdparm -d the transfer rate becomes about > > > 40MB/s > > > > What does hdparm -i say before and after? Is there any difference (the > > asterisk)? > > Sorry, I cannot reproduce this behaviour again. (I just did a reboot) I am > not sure what happened, as I am using the same kernel and bios-setup. Kind > of strange non-deterministic behaviour here. However, as far as can > remember (it has been some days ago) I did not see something different in > hdparm -i before ore after the switching of and on. Both times udma-5 were > reported by hdparm. > > As I cannot reproduce this behaviour now, I suggest we forget about > it. Maybe I did something wird when this happened. I will contact you > whenever I notice the same behaviour again.
Ok; thanks.
> > > > > > > The PCI latency is set in the BIOS setup, and according to /proc/pci this > > > latency is applied to all PCI devices except my matrox G550 video card, > > > which has a latency of 64. > > > > > > > > > I hope this explains something. > > > > Not much yet. > > > > > > > > > > > > > > > > > > > > > > > > > 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 > > > > > > > > > > > > > > >
-- 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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