Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt

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Subject: Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt
From: Stefan Nitschke (stefan_nitschke_AT_hotmail.com)
Date: Wed Nov 20 2002 - 15:27:09 EET

>From: Maarten de Boer <mdeboer_AT_iua.upf.es>
>Date: Wed, 20 Nov 2002 08:29:31 +0100
>
>On 19 Nov 2002 15:29:19 -0500
>jfm3 <jfm3_AT_ouroboros-complex.org> wrote:
>
> > I'm running the low latency and preemption kernel patches on 2.4.19. I'm
> > getting disk copy latency of around 10ms. Since I'm a real time person
> > (according to M. Goggins) who doesn't use the hd in real time, I can
> > live with this, but it bugs me. I've tried ext2 and ext3, no difference.
> > Any other tips?
>
>Do you have support for your chipset unabled under "IDE, ATA and ATAPI
>Block devices" in your kernel configuration, and "Use PCI DMA by default
>when available"? I believe this is rather important.
>
On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33
get LL working fine. (<3ms)

- Stefan

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