[ardour-users] Intel EM64T and Ardour+VST

Steven Chamberlain steven at pyro.eu.org
Thu Aug 24 08:47:41 PDT 2006

Andrew Johnston wrote:
>I am currently running a gentoo 64 bit install on my AMD64 dual core
>3800+. I do agree with the replies above, however I have chosen to
>stay with 64 bit after trying to redo my gentoo install with 32bit,
>and having huge problems.

Have you tried making a 32-bit chroot? On Debian this was quite easy for
me. In /var/chroot I have a fairly minimal 32-bit Debian install in
which I can compile and run software that only works in a 32-bit
userland. But I don't believe I've ever had problems running ardour or
ardour2 under a 64-bit userland -- except VST, because I couldn't get
WINE to compile in 64-bit. Perhaps this has changed since then, or if
not, it will no doubt work inside the 32-bit chroot. But with the huge
amount of progress Linux audio is making these days, I can quite easily
live without VST.

>The only problems I ever encounter is with JACK running my kernel
>with SMP support (a well known but as of yet unfixed bug).  I also
>find the system a little more unstable as a whole

I've been having a lot of these kind of problems ever since I got my
Athlon dual-core, but I didn't realise it was affecting other people.
I had to go back to 2.6.16-rt29 to find some stability with SMP enabled,
but I still battle with high latencies.

>On 8/24/06, George Chan <george at goodmusic.ca> wrote:
>>Most video codecs (like for mplayer, etc.) are available for 32bit

Again, I managed this with a 32-bit chroot. I'm not familiar with Gentoo
but for Debian I found this guide helpful:
(though there is a mistake in the guide: '-arch' should be '--arch')

>>Also, I was never able to get a low latency kernel working in
>>64bit.  I tried something like 25(!) different configurations.
>>Every single one hung at boot up.  On my single CPU, 32bit machine,
>>the low latency kernel worked fine on my first try.

Did you try a 64-bit, uniprocessor kernel? I had no problems with 64-bit
rt- patched kernels until I got an Athlon X2 and enabled SMP. I think
SMP kernels without the rt- patch were also stable.

>>Also, there were intermittent problems with my video files playing
>>back at double normal speeds.  Never was able to fix that one.

Timer problems seem to be widely reported with Athlon dual-cores, though
it's never affected me; apparently things can run at double speed (even
the keyboard), or the system clock can speed up under higher CPU load.
Your problem might be somehow related to that.

Steven Chamberlain
steven at pyro.eu.org

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