Re: [LAU] Advice needed: hardware vendors

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To: Chris Metzler <cmetzler@...>
Cc: <linux-audio-user@...>
Date: Tuesday, April 8, 2014 - 9:39 pm

On Tue, 8 Apr 2014, Chris Metzler wrote:

> So, I'm looking to find out about hardware vendors. Specifically, I

I am certainly not an expert, but I have learned a few things and tend to
build all my machines rather than buy. The first thing to point out is
that gaming and low latency are two very different needs. Gaming is well
supported, but low latency is not (in any OS). When looking at a cpu for
low latency, the cheaper cpu with no hyperthreading will give better low
latency all else being equal. Most all in one cpu/gpu/etc chips are not
good for low latency (unless something new is any better) because these
kind of cpus the extra stuff on the chip steals time from the cpu outside
of the OS knowledge/control.

I can't remember where right now, but there is a real time site that has
latency results for a lot of mother board cpu combinations, I think I
actually got it from someone on this list.

PCI slots seem to have become a problem, they seem to be PCIe bridged
slots on most new MB.

A flexable BIOS can be very helpful for getting good low latency
performance.

Expect to run your CPU at a lower speed than full for audio work. This can
be set on the fly so speed can be ondemand for gaming and set to 70-80%
full speed for audio. Many people just set performance mode for audio, but
this may make things too hot and the cpu temp sensor may change the cpu
speed on you in the middle of your best take giving a glitch. I have found
that even running my MB at half speed I get better latency/no xruns as
compaired to the faster ondemand setting. The main thing is to force a
single speed for audio while not creating too much heat. The MB/CPU
manufactures seem to have learned a lot from the overclocking crowd and
most new MB effectively over clock all the time and regulate the speed by
temperature. We don't want to do that for audio.

Intel GPUs are open but nvidia seem to perform better and Linux drivers
are available. The choice here is how close you want to stick to all open
SW. I have not heard anything to recomend AMD GPUs and so I have no
experience with them either. The intel video on the atom boards are not
open and poorly supported, but I didn't think you were buying one of these
anyway even though their low latency performance is quite good. (can be
anyway)

Firewire ports don't come on MB that I have seen, Make sure you can get an
interface that will fit whatever MB you want to use.

--
Len Ovens
www.ovenwerks.net

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Messages in current thread:
[LAU] Advice needed: hardware vendors, Chris Metzler, (Tue Apr 8, 5:34 am)
Re: [LAU] Advice needed: hardware vendors, Len Ovens, (Tue Apr 8, 9:39 pm)
Re: [LAU] Advice needed: hardware vendors, Ede Wolf, (Wed Apr 9, 9:57 am)
Re: [LAU] Advice needed: hardware vendors, Len Ovens, (Wed Apr 9, 1:13 pm)
Re: [LAU] Advice needed: hardware vendors, Luke Hart, (Wed Apr 9, 2:41 pm)
Re: [LAU] Advice needed: hardware vendors, Len Ovens, (Wed Apr 9, 9:52 pm)
Re: [LAU] Advice needed: hardware vendors, Ede Wolf, (Wed Apr 9, 1:52 pm)
Re: [LAU] Advice needed: hardware vendors, Kevin Cosgrove, (Wed Apr 9, 12:30 am)
[LAU] hardware - Intel CPUs, Len Ovens, (Mon Apr 14, 1:12 am)
Re: [LAU] Advice needed: hardware vendors, Len Ovens, (Wed Apr 9, 1:47 am)
Re: [LAU] Advice needed: hardware vendors, Kevin Cosgrove, (Wed Apr 9, 3:26 pm)
Re: [LAU] Advice needed: hardware vendors, Patrick Shirkey, (Wed Apr 9, 8:23 am)
Re: [LAU] Advice needed: hardware vendors, Neil, (Tue Apr 8, 11:00 pm)
Re: [LAU] Advice needed: hardware vendors, Patrick Shirkey, (Tue Apr 8, 6:59 am)
Re: [LAU] Advice needed: hardware vendors, Charles Z Henry, (Tue Apr 8, 8:58 pm)
Re: [LAU] Advice needed: hardware vendors, Tilo Kremer, (Tue Apr 8, 9:59 pm)