14 Feb
2009
14 Feb
'09
9:24 a.m.
Greetings,
As some of you know, I've had nothing but trouble with Ubuntu's rt
kernel, specifically 2.6.27-3-rt from the current repos. As a result
I've been working in non-realtime, and I'm not happy about it.
So, what's my best procedure here ? Shall I compile my own kernel, and
if so, what's the currently recommended kernel source package ? I want
decent realtime performance from this machine, a 2 GHz notebook, and I'm
willing to do some building if necessary.
Is the patch for ALSA (that showed up on this list) included in any
contemporary sources ?
Is anyone here running Ubuntu 8.10 with an rt kernel, and if so, which one ?
Best,
dp
14 Feb
14 Feb
9:46 a.m.
On Sat, Feb 14, 2009 at 8:24 AM, Dave Phillips <dlphillips(a)woh.rr.com> wrote:
So, what's my best procedure here ? Shall I
compile my own kernel, and
if so, what's the currently recommended kernel source package ? I want
decent realtime performance from this machine, a 2 GHz notebook, and I'm
willing to do some building if necessary.
Is the patch for ALSA (that showed up on this list) included in any
contemporary sources ?
I'm using 2.6.26.8-rt12 with the midi seq patch, works fine....testing
the latest rt at kernel.org a little later.
--
aRDy Music and Rick Dicaire present:
http://www.ardynet.com
http://www.ardynet.com:9000/ardymusic.ogg.m3u
10:06 a.m.
Den Saturday 14 February 2009 14:24:30 skrev Dave Phillips:
...
As some of you know, I've had nothing but trouble
with Ubuntu's rt
kernel, specifically 2.6.27-3-rt from the current repos. As a result
I've been working in non-realtime, and I'm not happy about it.
I'm not 100% sure what your problem was, it was xruns even after using an
external card and a machine with an Intel card? Anyway, I have a dual core 1.3
CPU machine with an internal Intel card and Ubuntu 8.10 with the KDE 4.2 (I
used to have open box when running rt-kernel) desktop and an external USB
card. I did have plenty of xruns even with the external card and nothing
helped before I started using jackdmp 1.9.
Now, I have no more xruns (using 2.6.27-3-rt on 8.10 with KDE 4.2 desktop) and
the latency I use when recording is normally 1.45 ms on my lap top with acpi
off. The USB card is an old M-audio Mobile PreUSB (44100 16-bit). I do not
record often with on my lap top, but everything works fine when I have to use
it.
So you might give the 2.6.27-3-rt the last chance with some help from jackdmp
1.9 (the upcoming jack 2.0). I have used jackdmp around 11 months now and it's
IMO the only choice on a 64 bits machine with more than one core. I also use
jackdmp on my studio machine and are really happy with it.
I hope this helps.
Jostein
10:45 a.m.
Jostein Chr. Andersen wrote:
... I have no more xruns (using 2.6.27-3-rt on 8.10
with KDE 4.2
desktop) and the latency I use when recording is normally 1.45 ms on
my lap top with acpi off. The USB card is an old M-audio Mobile PreUSB
(44100 16-bit). I do not record often with on my lap top, but
everything works fine when I have to use it.
So you might give the 2.6.27-3-rt the last chance with some help from
jackdmp 1.9 (the upcoming jack 2.0). I have used jackdmp around 11
months now and it's IMO the only choice on a 64 bits machine with more
than one core. I also use jackdmp on my studio machine and are really
happy with it.
I hope this helps.
Hi Jostein,
This is interesting. Did you patch the rt sources at all or are you
running the kernel as it came from the repo ? Did you simply drop-in the
jackdmp version of jackd (./waf configure --prefix=/usr) or was any
other action required ?
Btw, I determined that the rt kernel was causing many of the troubles I
had with 8.10. Running the non-rt kernel eliminates those problems,
specifically the system hang at logout or shutdown. Of course, it also
leaves me without an rt-capable kernel. :(
Best,
dp
11:46 a.m.
Hi Dave,
Den Saturday 14 February 2009 15:45:58 skrev Dave Phillips:
Jostein Chr. Andersen wrote:
I use the repo RT kernel without patches but , but almost all the other music
related stuff are compiled from sources. I also pass acpi=off to the kernel
parameter (2.6.27-3-rt) in /boot/grub/menu.lst.
My use of waf does probably do the same as you suggested, here is my
configure recipe:
PREFIX=/usr ./waf configure
./waf build
sudo ./waf install.
This way, 1.9 will replace your current jack installation. Some programs might
probably complain because 1.9 do have a slightly different API, but my Ardour
2.7.1, Rosegarden 1.7.2, CVS version of the Linuxsampler apps and all
important LV2 and LADSPA plugins works just fine, so I'm happy.
Jostein
... I have no more xruns (using 2.6.27-3-rt on
8.10 with KDE 4.2
desktop) and the latency I use when recording is normally 1.45 ms on
my lap top with acpi off. The USB card is an old M-audio Mobile PreUSB
(44100 16-bit). I do not record often with on my lap top, but
everything works fine when I have to use it.
So you might give the 2.6.27-3-rt the last chance with some help from
jackdmp 1.9 (the upcoming jack 2.0). I have used jackdmp around 11
months now and it's IMO the only choice on a 64 bits machine with more
than one core. I also use jackdmp on my studio machine and are really
happy with it.
I hope this helps.
Hi Jostein,
This is interesting. Did you patch the rt sources at all or are you
running the kernel as it came from the repo ? Did you simply drop-in the
jackdmp version of jackd (./waf configure --prefix=/usr) or was any
other action required ? 
12:29 p.m.
On Saturday 14 February 2009 09:45:58 Dave Phillips wrote:
Jostein Chr. Andersen wrote:
Dave, fyi I am running 2.6.24-23-rt #1 SMP PREEMPT RT Mon Jan 26 02:29:24 UTC
2009 i686 GNU/Linux" on a box that shows "Welcome to Ubuntu 8.04 LTS!" in
firefox. iirc, this was a box installed and then apt-get install
ubuntu-studio at some point in the past.
This box used to shut of properly at first, then at some point after an
upgrade, it started having the hang on shutdown problem. (Especially if the
net connection was down. The box was also extremely unresponsive if it booted
with no net connection.) While it was having that problem, it did not always
hang but did quite a lot. I got the feeling that there was less chance of a
hang if I shut down all apps and waited for some time before starting the
shutdown. After a recent upgrade, I haven't noticed the hang on shutdown for
a good long while.
I hope this long ramble may give you some things to try.
... I have no more xruns (using 2.6.27-3-rt on
8.10 with KDE 4.2
desktop) and the latency I use when recording is normally 1.45 ms on
my lap top with acpi off. The USB card is an old M-audio Mobile PreUSB
(44100 16-bit). I do not record often with on my lap top, but
everything works fine when I have to use it.
So you might give the 2.6.27-3-rt the last chance with some help from
jackdmp 1.9 (the upcoming jack 2.0). I have used jackdmp around 11
months now and it's IMO the only choice on a 64 bits machine with more
than one core. I also use jackdmp on my studio machine and are really
happy with it.
I hope this helps.
Hi Jostein,
This is interesting. Did you patch the rt sources at all or are you
running the kernel as it came from the repo ? Did you simply drop-in the
jackdmp version of jackd (./waf configure --prefix=/usr) or was any
other action required ?
Btw, I determined that the rt kernel was causing many of the troubles I
had with 8.10. Running the non-rt kernel eliminates those problems,
specifically the system hang at logout or shutdown. Of course, it also
leaves me without an rt-capable kernel. :(
Best,
dp
all the best,
drew
1:52 p.m.
On Sat, Feb 14, 2009 at 5:24 AM, Dave Phillips <dlphillips(a)woh.rr.com> wrote:
Greetings,
As some of you know, I've had nothing but trouble with Ubuntu's rt
kernel, specifically 2.6.27-3-rt from the current repos. As a result
I've been working in non-realtime, and I'm not happy about it.
So, what's my best procedure here ? Shall I compile my own kernel, and
if so, what's the currently recommended kernel source package ? I want
decent realtime performance from this machine, a 2 GHz notebook, and I'm
willing to do some building if necessary.
Is the patch for ALSA (that showed up on this list) included in any
contemporary sources ?
Is anyone here running Ubuntu 8.10 with an rt kernel, and if so, which one ?
Best,
dp
Dave,
I guess I could use a little more info before I even suggest a path
for you to take. when you say the "Ubuntu rt kernel" is this just the
standard rt kernel but supplied by Ubuntu, or is this an Ubuntu kernel
(i.e. - a kernel.org kernel patched with Ubuntu patches) and then
further patched with the rt stuff?
My #1 suggestion is to make sure you are just using the standard rt
kernel. I had a bit of trouble with 2.6.25-rt so I stayed with 2.6.24
for a while and just recently moved to 2.6.26.8-rt12 which is working
fine for me but did require that I reconfigure it from scratch instead
of using make oldconfig so building it was a little more painful. It's
working well though.
I guess it's just me but I don't understand the motivation for
running the newest rt kernel. I upgrade every 2-3 major kernel
revisions these days, or when I hear about a major bug, security
issue, etc. I used 2.6.21, 24 and now 26.
- Mark
2:09 p.m.
Mark Knecht wrote:
On Sat, Feb 14, 2009 at 5:24 AM, Dave Phillips
<dlphillips(a)woh.rr.com> wrote:
Hi Mark,
According to its Synaptic entry the 2.6.27-3-rt kernel is built from the
2.6.27 sources with Ingo Molnar's patch for 2.6.25.5-rt9.
As some of you know, I've had nothing but
trouble with Ubuntu's rt
kernel, specifically 2.6.27-3-rt from the current repos. As a result
I've been working in non-realtime, and I'm not happy about it.
...
I guess I could use a little more info before I even suggest a path
for you to take. when you say the "Ubuntu rt kernel" is this just the
standard rt kernel but supplied by Ubuntu, or is this an Ubuntu kernel
(i.e. - a kernel.org kernel patched with Ubuntu patches) and then
further patched with the rt stuff?
My #1 suggestion is to make sure you are just using
the standard rt
kernel. I had a bit of trouble with 2.6.25-rt so I stayed with 2.6.24
for a while and just recently moved to 2.6.26.8-rt12 which is working
fine for me but did require that I reconfigure it from scratch instead
of using make oldconfig so building it was a little more painful. It's
working well though.
I don't mind the configuration, even though it's been a while. I can
hack it. :)
I guess it's just me but I don't understand
the motivation for
running the newest rt kernel. I upgrade every 2-3 major kernel
revisions these days, or when I hear about a major bug, security
issue, etc. I used 2.6.21, 24 and now 26.
I'll be pleased to have *any* working rt kernel on this system.
Btw, will I still need the LAU list patch for ALSA ?
Best,
dp
2:23 p.m.
On Sat, Feb 14, 2009 at 10:09 AM, Dave Phillips <dlphillips(a)woh.rr.com> wrote:
It won't be hacking, knowing you. More likely a minor work or art. ;-)
?????? What's that? We need a kernel patch to make the LAU list work? ;-)
Here are the links that Steven posted when -rt14 was released. You
might start with these and take a copy of my -rt12 .config file. you'd
probably only need to change chipset stuff to get it working:
There's also an -rt15 but I didn't see much traffic on that.
- Mark
Mark Knecht wrote:
Right there it seems inconsistent. Why isn't it built with the patches
that were released for 2.6.27?
On Sat, Feb 14, 2009 at 5:24 AM, Dave Phillips <dlphillips(a)woh.rr.com>
wrote:
Hi Mark,
According to its Synaptic entry the 2.6.27-3-rt kernel is built from the
2.6.27 sources with Ingo Molnar's patch for 2.6.25.5-rt9.
As some of you know, I've had nothing but trouble with Ubuntu's rt
kernel, specifically 2.6.27-3-rt from the current repos. As a result
I've been working in non-realtime, and I'm not happy about it.
...
I guess I could use a little more info before I even suggest a path
for you to take. when you say the "Ubuntu rt kernel" is this just the
standard rt kernel but supplied by Ubuntu, or is this an Ubuntu kernel
(i.e. - a kernel.org kernel patched with Ubuntu patches) and then
further patched with the rt stuff?
My #1 suggestion is to make sure you are just
using the standard rt
kernel. I had a bit of trouble with 2.6.25-rt so I stayed with 2.6.24
for a while and just recently moved to 2.6.26.8-rt12 which is working
fine for me but did require that I reconfigure it from scratch instead
of using make oldconfig so building it was a little more painful. It's
working well though.
I don't mind the configuration, even though it's been a while. I can hack
it. :)
I guess
it's just me but I don't understand the motivation for
running the newest rt kernel. I upgrade every 2-3 major kernel
revisions these days, or when I hear about a major bug, security
issue, etc. I used 2.6.21, 24 and now 26.
I'll be pleased to have *any* working rt kernel on this system.
Btw, will I still need the LAU list patch for ALSA ?
4:11 p.m.
Mark Knecht wrote:
On Sat, Feb 14, 2009 at 10:09 AM, Dave Phillips
<dlphillips(a)woh.rr.com> wrote:
Sometimes I wonder, sometimes I wonder... :)
Someone posted a patch that fixed an ALSA problem. I still have the
message, I'll find it and apply the patch. IIRC it's a one-line fix
Btw, will I still need the LAU list patch for
ALSA ?
?????? What's that? We need a kernel patch to make the LAU list work? ;-)
Here are the links that Steven posted when -rt14 was
released. You
might start with these and take a copy of my -rt12 .config file. you'd
probably only need to change chipset stuff to get it working:
There's also an -rt15 but I didn't see much traffic on that.
He's already up to rt16 but I'll stick with rt14 for now. Please do send
your kernel config file, I don't mind starting from scratch but it'll be
helpful to have a head start. :)
Now that I think of it, I'm not sure when I last compiled a Linux
kernel. It's been a while.
Best,
dp
4:31 p.m.
On Sat, 14 Feb 2009 15:11:02 -0500
Dave Phillips <dlphillips(a)woh.rr.com> wrote:
Mark Knecht wrote:
I'm not sure whether you are referring to starting from the default config
or just the incremental changes vs your current kernel config but in case
it's helpful to anyone, you can get your current kernel config from
/boot/config-`uname -r` and all the other kernels you have installed
via the package manager (including make-kpkg kernels you compiled yourself).
are in /boot too.
pete.
On Sat, Feb 14, 2009 at 10:09 AM, Dave Phillips
<dlphillips(a)woh.rr.com> wrote:
Sometimes I wonder, sometimes I wonder... :)
Someone posted a patch that fixed an ALSA problem. I still have the
message, I'll find it and apply the patch. IIRC it's a one-line fix
Btw, will I still need the LAU list patch for
ALSA ?
?????? What's that? We need a kernel patch to make the LAU list work? ;-)
Here are the links that Steven posted when -rt14
was released. You
might start with these and take a copy of my -rt12 .config file. you'd
probably only need to change chipset stuff to get it working:
There's also an -rt15 but I didn't see much traffic on that.
He's already up to rt16 but I'll stick with rt14 for now. Please do send
your kernel config file, I don't mind starting from scratch but it'll be
helpful to have a head start. :)
6:07 p.m.
Sent file off list. Best of luck!
- Mark
On Sat, Feb 14, 2009 at 12:11 PM, Dave Phillips <dlphillips(a)woh.rr.com> wrote:
Mark Knecht wrote:
On Sat, Feb 14, 2009 at 10:09 AM, Dave Phillips <dlphillips(a)woh.rr.com>
wrote:
Sometimes I wonder, sometimes I wonder... :)
Someone posted a patch that fixed an ALSA problem. I still have the message,
I'll find it and apply the patch. IIRC it's a one-line fix
Btw, will I still need the LAU list patch for ALSA ?
?????? What's that? We need a kernel patch to make the LAU list work? ;-)
Here are the links that Steven posted when -rt14
was released. You
might start with these and take a copy of my -rt12 .config file. you'd
probably only need to change chipset stuff to get it working:
There's also an -rt15 but I didn't see much traffic on that.
He's already up to rt16 but I'll stick with rt14 for now. Please do send
your kernel config file, I don't mind starting from scratch but it'll be
helpful to have a head start. :)
Now that I think of it, I'm not sure when I last compiled a Linux kernel.
It's been a while.
Best,
dp
17 Feb
17 Feb
9:17 a.m.
On Sat, 2009-02-14 at 08:24 -0500, Dave Phillips wrote:
Greetings,
As some of you know, I've had nothing but trouble with Ubuntu's rt
kernel, specifically 2.6.27-3-rt from the current repos. As a result
I've been working in non-realtime, and I'm not happy about it.
So, what's my best procedure here ? Shall I compile my own kernel
Stop using Ubuntu. Their realtime kernel is seriously flawed in many
ways. USB MIDI is broken, and there is little or no support for
binary-only drivers.
Since Ubuntu seems to be going down the Microsoft-like "You will do it
our way or you will not do it at all" route, I can no longer recommend
Ubuntu for any purpose.
Gordon
9:50 a.m.
Gordon J. C. Pearce MM3YEQ wrote:
Stop using Ubuntu. Their realtime kernel is seriously flawed in many
ways. USB MIDI is broken, and there is little or no support for
binary-only drivers.
I've been using 8.10 without the rt kernel and am fairly happy with it
as a general purpose system. However, for my music purposes I need an rt
kernel, hence the original post.
Since Ubuntu seems to be going down the Microsoft-like
"You will do it
our way or you will not do it at all" route, I can no longer recommend
Ubuntu for any purpose.
I assume you refer to Intrepid ? Hardy seems well-regarded and (IIRC) is
now the basis for the upcoming release of 64 Studio 3.0.
Best,
dp
18 Feb
18 Feb
2:55 p.m.
Dave-
While it has been a while since I compiled a kernel, I think you might
want to look at this if you are looking for stable...
http://linuxdevices.com/news/NS2660945418.html
Essentially the PREEMPT_RT patches are only considered stable at this time
on up to 2.6.26, the newer stuff should be considered dev. At least if I
understood the article correctly. At any rate this is probably where I
would start if I was going to compile one today from scratch.
Seablade
On Tue, Feb 17, 2009 at 8:50 AM, Dave Phillips <dlphillips(a)woh.rr.com>wrote;wrote:
Gordon J. C. Pearce MM3YEQ wrote:
Stop using Ubuntu. Their realtime kernel is seriously flawed in many
ways. USB MIDI is broken, and there is little or no support for
binary-only drivers.
I've been using 8.10 without the rt kernel and am fairly happy with it
as a general purpose system. However, for my music purposes I need an rt
kernel, hence the original post.
Since Ubuntu seems to be going down the
Microsoft-like "You will do it
our way or you will not do it at all" route, I can no longer recommend
Ubuntu for any purpose.
I assume you refer to Intrepid ? Hardy seems well-regarded and (IIRC) is
now the basis for the upcoming release of 64 Studio 3.0.
Best,
dp
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14 comments
8 participants
participants (8)
-
Dave Phillips -
drew Roberts -
Gordon J. C. Pearce MM3YEQ -
Jostein Chr. Andersen -
Mark Knecht -
pete shorthose -
R Dicaire -
Thomas Vecchione