From: Jaroslav Kysela <perex@suse.cz>
To: linux-sound@vger.kernel.org
Subject: Re: Bad MIDI performance : 10ms latency instead of the expected
Date: Thu, 26 Aug 1999 20:51:18 +0000 [thread overview]
Message-ID: <marc-linux-sound-93570827715277@msgid-missing> (raw)
In-Reply-To: <marc-linux-sound-93568883025986@msgid-missing>
On Thu, 26 Aug 1999, Alan Cox wrote:
> > > 200bytes/sec is just rudiculous , how do you plan to drive an external synth
> > > with that little MIDI bandwidth ?
> >
> > I need a timer around 2000Hz for some good code. I won't support polling
> > mode (busy loop) in any case.
>
> Then your code will never be usable. Some hardware sucks, you have to do
> limited polling with a timer backoff. A well tuned polling loop will often
> work out nicely providing you are careful. Remember with irqs on you are
> just like busy in userspace no worse. You can even do
>
> while(poll_input()=0)
> {
> if(current->need_resched())
> schedule();
> }
>
> sort of stuff
Is possible to create some thread for this loop inside kernel module?
I don't want to suspend the application execution due to a broken
hardware. I did some tests with 2.2 kernels (using kernel_thread()) and
I've not been successful.
Jaroslav
-----
Jaroslav Kysela <perex@suse.cz>
SuSE Linux http://www.suse.com
ALSA project http://www.alsa-project.org
next prev parent reply other threads:[~1999-08-26 20:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-26 17:34 Bad MIDI performance : 10ms latency instead of the expected 1-1.5ms Benno Senoner
1999-08-26 18:42 ` Bad MIDI performance : 10ms latency instead of the expected Jaroslav Kysela
1999-08-26 19:38 ` Bad MIDI performance : 10ms latency instead of the expected 1-1.5ms Benno Senoner
1999-08-26 20:20 ` Bad MIDI performance : 10ms latency instead of the expected Alan Cox
1999-08-26 20:41 ` Alan Cox
1999-08-26 20:42 ` Bad MIDI performance : 10ms latency instead of the expected 1-1.5ms Benno Senoner
1999-08-26 20:51 ` Jaroslav Kysela [this message]
1999-08-26 21:04 ` Bad MIDI performance : 10ms latency instead of the expected Alan Cox
1999-08-26 21:53 ` Benno Senoner
1999-09-18 21:26 ` Bad MIDI performance : 10ms latency instead of the expected 1-1.5ms Peter Enderborg
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