linuxaudio.org

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Thanks to my neighbor a few hours north, Brent for the confirmation.=A0 Was=

 not aware of any "quota" on questions and did not mean to monopolize anyth=

ing, just trying to learn some things here. Apologies if error was made.
Thanks to Brent's assist, am now aware that those are IRQ statements, but s=

till uncertain where to plug those in. Guess will keep googling in search o=

f answers.

=A0=A0 Paul
--- On Tue, 8/4/09, Brent Busby  wrote:
From: Brent Busby

Subject: Re: [LAU] resubmitting questions from last week

To: "Linux Audio User" , "Paul Neave=

ill"

Date: Tuesday, August 4, 2009, 1:35 PM
On Mon, 3 Aug 2009, Paul Neaveill wrote:
> Sorry if someone responded and we missed it, but despite much googling an=

d all of that, am still working on getting my own kernel(s) [2 machines] go=

ing with the following as had been suggested last week:

quoted text
>=20

> preempt_RCU

> No_Hz

> HZ_1000

>=20

> and the other Rock-solid low-latency audio tweaks

> 99 ff migration

> 99 ff posixcputmr

> 98 ff IRQ-8 (real-time clock)

> 97 ff audio IRQ

> 80 rr Jack

>=20

> Found the preempt_RCU and HZ_1000 spots in the debian/ubuntu kernel hack,=

 still looking for the rest please.?

quoted text
>=20

> ** Would really appreciate the assistance with figuring out where/how to =

put those.

I never did get an answer to some of those questions either, so I figured m=

aybe I'd been asking too many.=A0 (I have been posting a lot of them lately=

.)
I think the ones you've got at the top for kernel options should be safe.=

=A0 I'm going to try -- at least initially -- not adjusting any IRQ priorit=

ies though.=A0 It might work, considering I've got a fast machine, and from=

 what I hear, there are even people getting away with ordinary non-RT kerne=

ls these days.
Preempt RCU was supposed to be buggy for awhile, but tested now for two yea=

rs...=A0 (Source:=A0 LKML)
Somebody said NO_HZ was actually a good thing on a laptop being used for pr=

o-audio, and I suppose if you can do well on a laptop you can do well anywh=

ere...=A0 (Source:=A0 Some guy with a laptop.)
And HZ_1000 is recommended almost everywhere.
I don't know what the meaning of NO_HZ and HZ_1000 is together, but I guess=

 it'd mean a jiffy rate of 1000Hz, but only when interrupts are needed?
I'm just putting stuff together from lots of googling too...
-- + Brent A. Busby=A0=A0=A0=A0=A0+ "We've all heard that a million monkeys

+ UNIX Systems Admin=A0=A0=A0=A0=A0+=A0 banging on a million typewriters wi=

ll

+ University of Chicago=A0=A0=A0=A0=A0+=A0 eventually reproduce the entire =

works of

+ Physical Sciences Div. +=A0 Shakespeare.=A0 Now, thanks to the Internet,

+ James Franck Institute +=A0 we know this is not true." -Robert Wilensky

=0A=0A=0A

--0-462239088-1249426224=:56897

Content-Type: text/html; charset=iso-8859-1

Content-Transfer-Encoding: quoted-printable
Thanks to my neighbor a few hours north, Bren=

t for the confirmation.  Was not aware of any "quota" on questions and=

 did not mean to monopolize anything, just trying to learn some things here=

. Apologies if error was made.Thanks to Brent's assist, am now awar=

e that those are IRQ statements, but still uncertain where to plug those in=

. Guess will keep googling in search of answers.  =

 Paul--- On Tue, 8/4/09, Brent Busby <brent@key=

corner.org> wrote:From: Brent B=

usby <brent@keycorner.org>Subject: Re: [LAU] resubmitting questio=

ns from last weekTo: "Linux Audio User" <linux-audio-user@lists.linu=

xaudio.org>, "Paul Neaveill" <boycotthell2005@yahoo.com>Date:

 Tuesday, August 4, 2009, 1:35 PMOn Mon, 3=

 Aug 2009, Paul Neaveill wrote:> Sorry if someone responded and =

we missed it, but despite much googling and all of that, am still working o=

n getting my own kernel(s) [2 machines] going with the following as had bee=

n suggested last week:> > preempt_RCU> No_Hz> H=

Z_1000> > and the other Rock-solid low-latency audio tweaks> 99 ff migration> 99 ff posixcputmr> 98 ff IRQ-8 (real-=

time clock)> 97 ff audio IRQ> 80 rr Jack> > Fou=

nd the preempt_RCU and HZ_1000 spots in the debian/ubuntu kernel hack, stil=

l looking for the rest please.?> > ** Would really appreciate=

 the assistance with figuring out where/how to put those.I never di=

d get an answer to some of those questions either, so I figured maybe I'd b=

een asking too many.  (I have been posting a lot of them

 lately.)I think the ones you've got at the top for kernel options =

should be safe.  I'm going to try -- at least initially -- not adjusti=

ng any IRQ priorities though.  It might work, considering I've got a f=

ast machine, and from what I hear, there are even people getting away with =

ordinary non-RT kernels these days.Preempt RCU was supposed to be b=

uggy for awhile, but tested now for two years...  (Source:  LKML)=

Somebody said NO_HZ was actually a good thing on a laptop being use=

d for pro-audio, and I suppose if you can do well on a laptop you can do we=

ll anywhere...  (Source:  Some guy with a laptop.)And HZ_=

1000 is recommended almost everywhere.I don't know what the meaning=

 of NO_HZ and HZ_1000 is together, but I guess it'd mean a jiffy rate of 10=

00Hz, but only when interrupts are needed?I'm just putting stuff to=

gether from lots of googling too...-- + Brent A.

 Busby     + "We've all heard that a million monke=

ys+ UNIX Systems Admin     +  banging on =

a million typewriters will+ University of Chicago   &nbs=

p; +  eventually reproduce the entire works of+ Physical Scie=

nces Div. +  Shakespeare.  Now, thanks to the Internet,+ Jame=

s Franck Institute +  we know this is not true." -Robert Wilensky<=

/div>=0A=0A=0A=0A

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