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From: Adam Schrotenboer <adam@tabris.net>
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To: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Scheduler ( was: Just a second ) ...
Date: Tue, 18 Dec 2001 09:21:08 -0500
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On Monday 17 December 2001 23:55, William Lee Irwin III wrote:
> On Mon, Dec 17, 2001 at 08:27:18PM -0800, Linus Torvalds wrote:
> > The most likely cause is simply waking up after each sound interrupt: you
> > also have a _lot_ of time handling interrupts. Quite frankly, web surfing
> > and mp3 playing simply shouldn't use any noticeable amounts of CPU.
>
> I think we have a winner:
> /proc/interrupts
> ------------------------------------------------
>            CPU0
>   0:   17321824          XT-PIC  timer
>   1:          4          XT-PIC  keyboard
>   2:          0          XT-PIC  cascade
>   5:   46490271          XT-PIC  soundblaster
>   9:     400232          XT-PIC  usb-ohci, eth0, eth1
>  11:     939150          XT-PIC  aic7xxx, aic7xxx
>  14:         13          XT-PIC  ide0
>
> Approximately 4 times more often than the timer interrupt.
> That's not nice...

FWIW, I have an ES1371 based sound card, and mpg123 drives it at 172 
interrupts/sec (calculated in procinfo). But that _is_ only when playing. And 
(my slightly hacked) timidity drives my card w/ only 23(@48kHz sample rate; 
21 @ 44.1kHz) interrupts/sec

Is this 172 figure right? (Not through esd either. i almost always turn it 
off, and sp recompiled mpg123 to use the std OSS driver)

>
> On Mon, Dec 17, 2001 at 08:27:18PM -0800, Linus Torvalds wrote:
> > Which sound driver are you using, just in case this _is_ the reason?
>
> SoundBlaster 16
> A change of hardware should help verify this.
>
>
> Cheers,
> Bill
> -
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