20 Jul
2003
20 Jul
'03
5:25 a.m.
Have any of the many gentoo users tried the mm-sources. Is it
just the low-latency patch? Does this mean anything for 2.5 and
now, wow, I see 2.6?
--ant
25 Jul
25 Jul
11:52 a.m.
Finally, another gentoo user!
I am not sure about the mm-sources, but I do know that other sources
come with preemptable kernel and low latency, like the gentoo source,
gaming sources and I beleive that the ac-sources do as well.
I am building a machine to do just this (ordering parts today, infact),
and was wondering the same thing. I asked this question on the gentoo
forum here: http://forums.gentoo.org/viewtopic.php?t=49131&highlight=
I received some advice there, but I did not get the prolific response I
was hoping for however. I hope someone else has something
earth-shattering to say here :0).
Good luck on your quest anthony, I will be watching this thread as well!
Chris
Anthony wrote:
Have any of the many gentoo users tried the mm-sources.
Is it
just the low-latency patch? Does this mean anything for 2.5 and
now, wow, I see 2.6?
--ant
12:53 p.m.
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On Friday 25 July 2003 11:37, Chris wrote:
Finally, another gentoo user!
Not the only one here... :-)
- - Burkhard
- --
GNU/Linux in Education Wiki Project: http://book.schoolforge.net
public key ID:0xFD82303B - hkp://blackhole.pca.dfn.de
FP:0A65 5E83 F44F 47A5 3DFC 19C5 7779 E411 FD82 303B
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3:34 p.m.
On Fri, Jul 25, 2003 at 04:50:41PM +0200, Burkhard Woelfel wrote:
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On Friday 25 July 2003 11:37, Chris wrote:
Indeed. I'm running gentoo on my main box for a few months now.
Regarding kernel patches, with just a little grepping in the portage
tree I was able to glean the following info...
source latency-related info
------- ---------------------
ck-sources "in general his kernels are known to be VERY
low latency."
doesn't say what patches are contained, but
based on notes in other sources, I guess
LL, PE, and O(1)
gaming-sources ebuild contains a URL of a page that tells all:
http://members.optusnet.com.au/ckolivas/kernel/
... at which you can see it contains LL, PE,
and O(1) among other things.
Also read the FAQ, it mentions some notable bugs
e.g. hdparm is broken at least with gaming-sources
for 2.4.21:
http://members.optusnet.com.au/ckolivas/kernel/#faq
gentoo-sources "Based heavily on ck-sources-2.4.20-r2..."
contains LL,PE,O(1)
gs-sources contains LL, PE
gentoo-hardened - ck7-base (O(1), preempt, low latency)
mm-sources This is for 2.5/2.6 kernels, which I have not
really paid attention to. Contains some patches
from Andrew Morton.
wolf-sources "replaced:LowLatency in favor of lowlatency
fixes from latest -AA"
Note that you still have to pay attention to configuration options:
e.g. if you don't enable lowlatency and preemptible during kernel
config, the patches might as well not be there :-)
--
Paul Winkler
http://www.slinkp.com
Finally, another gentoo user!
Not the only one here... :-) 
5:51 p.m.
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Yet another Gentooer here!
On Friday 25 July 2003 19:14, Paul Winkler wrote:
On Fri, Jul 25, 2003 at 04:50:41PM +0200, Burkhard
Woelfel wrote:
My most favorite kernel tree... Unfortunately there have been
some issues with
XFS on the .21 releases so I stick to 2.4.20-ck6 atm. Very responsive even at
extreme CPU usage (gcc doing some serious work on a console). Less responsive
than other low-lat versions when your HDD goes postal on I/O. Pretty stable
though.
Keep out of version 2.4.20-ck5... it had some bitter issues
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On Friday 25 July 2003 11:37, Chris wrote:
Indeed. I'm running gentoo on my main box for a few months now.
Regarding kernel patches, with just a little grepping in the portage
tree I was able to glean the following info...
source latency-related info
------- ---------------------
ck-sources "in general his kernels are known to be VERY
low latency."
doesn't say what patches are contained, but
based on notes in other sources, I guess
LL, PE, and O(1) Finally, another gentoo user!
Not the only one here... :-) gaming-sources ebuild contains a URL of a page that
tells all:
http://members.optusnet.com.au/ckolivas/kernel/
... at which you can see it contains LL, PE,
and O(1) among other things.
Also read the FAQ, it mentions some notable bugs
e.g. hdparm is broken at least with gaming-sources
for 2.4.21:
http://members.optusnet.com.au/ckolivas/kernel/#faq
gaming is another gentoo
spin-off based heavily upon ck-sources (ck == Con
Kolivas, also author of the contest kernel benchmark)
gentoo-sources "Based heavily on
ck-sources-2.4.20-r2..."
contains LL,PE,O(1)
if it's still based on -r2, it's not the most
brilliant one. This is one of
the first ck kernels to implement the "elevator" idea for time slices.
gs-sources contains LL, PE
Never tried it...
I believe it's the tree gentoo uses for its liveCDs. Which
means "proven to work on most hardware..." So, if you have issues with other
preemptive, low-lat kernels, I guess this is the one safe choice.
gentoo-hardened - ck7-base (O(1), preempt, low
latency)
Ok, this contains the most relevant bits for low latency but I think is
supposed to concentrate more on security patches.
mm-sources This is for 2.5/2.6 kernels, which I have
not
really paid attention to. Contains some patches
from Andrew Morton.
I avoid experimental kernels like the plague... A bug in the
FS handling could
be devastating for me... Let's see how 2.6.x turns out, although it's rather
early since there are already some news on failed compiles when using this
kernel.
wolf-sources "replaced:LowLatency in favor of
lowlatency
fixes from latest -AA"
Actually it's WOLK: Working Overloaded Linux
Kernel. The name says it all...
Tried it once, back in the days of 2.4.18. You'll have nightmares in the
night about make menuconfig... There is so much extra stuff in there you
wouldn't believe. Of course, stability is not one of its strengths and it
seams that there is a pattern of time-related "entropy" to the kernel. After
uptimes of > 3 days, things just didn't feel so right. Reboot, and optimal
performance was back. Wouldn't reccomend it for production (making music
after all, IS production) unless you DO need some of the extra patches.
Note that you still have to pay attention to
configuration options:
e.g. if you don't enable lowlatency and preemptible during kernel
config, the patches might as well not be there :-)
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28 Jul
28 Jul
11:44 p.m.
I built a Gentoo audio system a little over a month ago. I kept a weblog
of the whole thing.
http://www.fallingforward.net/bbs/viewtopic.php?t=62
Regarding the gentoo-mm sources, I could not run that kernel with my
hardware. It would compile but kernel panic when I rebooted. Strangely
enough, I had to take the kernel config from a Mandrake installation, and
plug it into a stock kernel from kernel.org to get not only low-latency
but also DMA to work.
My gentoo system is alright now, but Rosegarden won't build, due to some
obscure little dependancy conflicts documented here:
http://www.all-day-breakfast.com/rosegarden/faq.html#toc13
And the most super obscure problem that just happened is Rosegarden CVS
won't autoconf because it thinks gentoo's autoconf version is 2.13 when
the package manager says it's 2.57-r1!
-l[e^2]
------------------------------
http://www.fallingforward.net/
people experimenting with music, art and technology
On Fri, 25 Jul 2003, Chris wrote:
Finally, another gentoo user!
I am not sure about the mm-sources, but I do know that other sources
come with preemptable kernel and low latency, like the gentoo source,
gaming sources and I beleive that the ac-sources do as well.
I am building a machine to do just this (ordering parts today, infact),
and was wondering the same thing. I asked this question on the gentoo
forum here: http://forums.gentoo.org/viewtopic.php?t=49131&highlight=
I received some advice there, but I did not get the prolific response I
was hoping for however. I hope someone else has something
earth-shattering to say here :0).
Good luck on your quest anthony, I will be watching this thread as well!
Chris
Anthony wrote:
Have any of the many gentoo users tried the
mm-sources. Is it
just the low-latency patch? Does this mean anything for 2.5 and
now, wow, I see 2.6?
--ant
7842
days inactive
7850
days old
linux-audio-user@lists.linuxaudio.org
5 comments
6 participants
participants (6)
-
Anthony -
Burkhard Woelfel -
Chris -
Gerasimos Grammatikopoulos -
Lee Azzarello -
Paul Winkler