Subject: Re: [Fwd: [linux-audio-dev] info point on linux hdr]
From: Stephen C. Tweedie (sct_AT_redhat.com)
Date: Mon Apr 17 2000 - 21:06:57 EEST
Hi,
On Mon, Apr 17, 2000 at 01:45:15PM -0400, Paul Barton-Davis wrote:
> >> 2) Why am I not having any of these problems ? Unlike Benno's code, I
> >> Seagate 4.5GB Cheetah U2W 10K rpm IBM 9GB UltraStar U2W 10K rpm
> >> Quantum 4.5GB Viking U2W 7.5K rpm 3 x IBM 18GB UltraStar
> >
> >Ahh --- SCSI. The request queuing for SCSI is very different to
> >that for non-SCSI devices.
>
> Different enough that you feel its likely to explain the significant
> difference between my experience and that of both Benno and Juhana
> when trying to record to disk ?
Potentially, yes.
> Is it different enough to explain why
> the buffer cache write-behind batching doesn't seem to show up as a
> problem for me ?
Again, yes. It's definitely worth trying the elevator fix.
> Stephen - thanks for paying attention and giving us time on this. I
> know you have a lot to work on, and that HDR is not what most people
> consider to be a hot Linux application;
No problem. Actually, many of the problems you are encountering
have parallels in high-end server systems too. This is definitely
an area where there is a lot of potential for interesting optimisations.
--Stephen
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