Subject: Re: [linux-audio-dev] Low Latencies. Which hardware to use?
From: Benno Senoner (sbenno_AT_gardena.net)
Date: Mon Jun 11 2001 - 12:51:32 EEST
I can only tell you from my personal experiences:
Soundcards: SB AWE64, TurtleBeach Tropez+ (ISA) , SB Live PCI
Gfx cards: S3 Virge PCI, ATI PCI, Matrox G400 AGP, Nvidia Riva TNT AGP
The above hw has never given me problems and all boxes seem to meet
3-4msec latencies (running a LL kernel).
The SB Live PCI seems the weakest one showing bigger and more frequent peaks
(still within the 3-4msec range) than the other cards, but I think this is is
only a driver issue.
All tests were performed stressing X very heavily.
I don't think that the GeForce is a piece of problematic hw, perhaps you have
only to tweak settins ? (AFAIK XF4.0 is a bit lowlatency unfriendly but it
can be tweaked (correct me if I'm wrong) , any infos here ?)
I tried LL kernels on an Acer Travelmate laptop too, but the only sounddriver
that works is the commercial OSS driver and it does not work with LL kernels.
Both ALSA and OSS/Free does not recognize the 256AV chipset.
But I guess that a properly tuned laptop (with supported audio hw) can deliver
good latencies too.
PS: If nothing goes wrong, I will be at Linuxtag, so if someone brings a few
large samples in gigasampler format we could demonstrate the disksampler
(EVO) in action.
The testversion I have here (not published yet because its a work in
progress) does not support looping and the loading of multiple instruments
that's why we would need long unlooped samples. (compressed samples are
unsupported too)
It does not support any other interface than an external MIDI in, so the only
way to drive it is through a masterkeyboard or an external PC feeding the
MIDI data.
Benno.
On Sunday 10 June 2001 21:46, you wrote:
> Hi,
>
> just where we have this latency discussion going again, I would
> be interested which hardware people use besides RME Hammerfall,
> that give low latency. At least with my combination of SB AWE32
> and Hoontech Yamaha XG I've got some problems (still without low latency
> kernel). I can test sampling yet with the Hoontech card, because neither
> the oss nor the alsa driver support sampling atm. The Ess Maestro builtin
> in my laptop doesn't make me happy either. Would be nice to use a laptop
> as portable guitar effect though :)
> Has anyone actually experienced side effects with X? Paul: How do you cope
> with X in ardour? If I for example move a window with the mouse in X
> I get dropouts (using a Geforce 2MX). AGP usually takes one interrupt,
> so it's not surprising to get dropouts during gfx card activity.
>
> Cheers, Alex
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