Re: [LAU]

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To: A list for linux audio users <linux-audio-user@...>
Subject: Re: [LAU]
Date: Thursday, May 31, 2012 - 11:14 am

On 05/31/2012 07:16 AM, Gabriel M. Beddingfield wrote:

Interesting! Thanks for sharing.

> While it has very good audio performance -- it has significantly less

LOL.

> * Processor has a high performance hit for inefficient

Clearly. i5 has 8192KB L1 cache.
I have not seen an ATOM CPU with more than 512KB.

> * Processor doesn't benefit as much from SIMD (SSE)

Only a few Atom models support >2GB. The D525 for instance does.

> Finally, all this experience is in 32-bit mode. I've been running in

For audio (read: jackd) 64 bit should make no difference. It's all 32
bit floats, anyway.

The Atom D525 that Egor and i recommended is not that bad. I don't have
access to an Atom N450, but the N270 is waaaay /slower/:

Here's a quick jconvolver benchmark:

A - Intel(R) Core(TM) Duo CPU @ 1.66GHz (32 bit - 2 cores, 2 CPUs)
B - Intel(R) Core(TM) i5 CPU @ 2.80GHz (64 bit - 4 cores, 4 CPUs)
C - Intel(R) Atom(TM) CPU D525 @ 1.80GHz (64 bit - 2 cores, 4 CPUs)
D - Intel(R) Atom(TM) CPU N270 @ 1.60GHz (32 bit - 1 core, 2 CPUs)

1) `jackd -d alsa -p1024` ;
4 instatances of `jconvolver weird.conf` in series
first and last instance connected to system:*

A: CPU-load: 16% (all CPUs) jack-DSP-load: 7.1%

B: CPU-load: 6% (all CPUs) jack-DSP-load: 6.2%

C: CPU-load: 13% (all CPUs) jack-DSP-load: 10.6%

D: CPU-load: 56% (all CPUs) jack-DSP-load: 24.9%

2) `jackd -d alsa -p64`
4 instatances of `jconvolver weird.conf` in series
first and last instance connected to system:*

A: CPU-load; 27% (all CPUs) jack-DSP-load: 13.0%

B: CPU-load: 8% (all CPUs) jack-DSP-load: 7.3%

C: CPU-load: 18% (all CPUs) jack-DSP-load: 20.3%

D: -- jconv exit with 2nd instance: processor can't keep up ---

ciao,
robin
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Messages in current thread:
[LAU] , Sciss, (Wed May 30, 1:09 pm)
Re: [LAU] , Robin Gareus, (Wed May 30, 3:59 pm)
Re: [LAU] , Sciss, (Wed May 30, 4:21 pm)
Re: [LAU] , Gabriel M. Beddingfield, (Thu May 31, 5:17 am)
Re: [LAU] , Joshua D. Boyd, (Fri Jun 1, 5:39 am)
Re: [LAU] , Gabriel M. Beddingfield, (Fri Jun 1, 3:46 pm)
Re: [LAU] , Robin Gareus, (Thu May 31, 11:14 am)
Re: [LAU] , S. Massy, (Thu May 31, 3:57 pm)
Re: [LAU] , Robin Gareus, (Wed May 30, 4:58 pm)
Re: [LAU] , Leigh Dyer, (Wed May 30, 11:24 pm)
Re: [LAU] , Egor Sanin, (Wed May 30, 6:10 pm)
Re: [LAU] , Kelly Hirai, (Wed May 30, 5:56 pm)
Re: [LAU] , Egor Sanin, (Wed May 30, 3:58 pm)
Re: [LAU] , Sciss, (Wed May 30, 4:08 pm)