Re: PATCH - MIDI on ice1724 - real-time kernel problem SOLVED(?)

From: Pavel Hofman <pavel.hofman@insite.cz>
To: "Martin Krüger" <m_a_krueger@gmx.de>
Cc: Takashi Iwai <tiwai@suse.de>, alsa-devel@alsa-project.org
Subject: Re: PATCH - MIDI on ice1724 - real-time kernel problem SOLVED(?)
Date: Sat, 07 Jun 2008 23:36:55 +0200	[thread overview]
Message-ID: <484AFF77.3030901@insite.cz> (raw)
In-Reply-To: <483ED652.6020805@insite.cz>

Pavel Hofman wrote:
> 
> Martin Krüger wrote:
>> Pavel Hofman schrieb:
>>> Hi Martin,
>>>
> ...............
>> Hi Pavel,
>>
>> now i'm confused. I just compiled the current daily snapshot with
>> "./configure --with-isapnp=no --with-sequencer=yes --with-oss=no 
>> --with-debug=verbose --with-cards=ice1724".
>>
>> That should give as much debug messages as i need, as i understood. I 
>> get only one Message, telling me that ice1724 is using the defined 
>> eeprom. After using the midi output port, there is no more message in 
>> any log at all.
> 
> That is OK, it means the loop-detection code does not kick in, i.e. 
> there is no problem with clearing interrupt status bits.
> 
>> Due to this, it is really hard to understand the problem, for me it 
>> looks like a complete freeze. If i would get "just" a heavy overload, 
>> the numlock should still react within 10 minutes, and the cpu cooler 
>> should be louder. Both of this should also happen during an irq flood, 
>> if i understood that right.
> 
> My IRQ flood loaded the PC heavily, but I could still switch windows and 
> move mouse around, with long delays. Yours looks like a real freeze.
> 
>> Do you have any idea how to find out whats happening there? 
> 
> I just add debug printk's to major code points all the way down to 
> bottom functions. It takes many compiling and rebooting (after freezes). 
>   Unfortunately I do not know of any other way to hunt the bug down.

Ubuntu Studio 7.10 with kernel upgraded to 2.6.25 according to 
http://74.125.39.104/search?q=cache:0fDGNG0KRbwJ:forum.zackyfiles.com/showthread.php%3Fp%3D3351188+gutsy+2.6.25+package&hl=en&ct=clnk&cd=1 

Latest download of alsa from git, compiled by ./gitcompile.

Ancient Duron 1GHz, Audiotrak Prodigy 192

Both MIDI input (amidi -p hw:0 -d) and output (amidi -p hw:0 -S 
F0411042110C000000000074FF0411042110C0000000000\
74F7F0411042110C000000000074F7F0411042110C0F0411\
042110C000000000074FF0411042110C000000000074F7F0\
411042110C000000000074F7F0411042110C0)
work fine, no problems.

Regards,

Pavel.
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