realtime troubles ...( Please help :x)

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realtime troubles ...( Please help :x)

(16 posts) (3 voices)

Started 10 months ago by fplolz
Latest reply from hassad

Tags:

rt realtime kernel hang crash

fplolz
Member

i recently got the reatltime kernel from aur for my multimedia needs.

Yes ..things when out well ...got my video driver reinstalled again ...and gotten the low latency i wanted

However , when i do play games or any thing that produces intensive sounds , the system would just lock up on me ...I managed to get a quick glimpse at top before the system crashed and i realised cpu usage was maxed..

So ...i was wondering if there is any way to trottle the cpu usage of the sound ( realtime threaded) applications

my /etc/security/limits.conf
@audio hard rtprio 100
@audio hard nice -1
@audio hard memlock 1048576

my /etc/sysctl.conf

dev.rtc.max-user-freq=1024
dev.hpet.max-user-freq=1024
fs.inotify.max_user_watches = 524288

is there anything wrong in the settings? ( and more info required? )

i still get those hangs when i play games and so on...3d games like urban terror...and so on
is there anywy to fix this?

Posted 10 months ago #
agi
Member

hi fplolz,

i'll be migrating my laptop this week. i hope i can help you with too sooner :-) currently, please provide us with a dmesg output when this occurred.. i might suggest a few things based on the messages.. is this related (or the same) as post #76?

personally i haven't delve with the realtime kernel mods yet, a kid can pull the plug on the gaming habits :-) and he did since i had mine.

Posted 10 months ago #
fplolz
Member

Hi agi :D

um...yes this problem is quite similiar to post 74 except its no longer limited to wine application and games ...:x

hm...yea . i am currently keeping 2 kernels ...just for different purposes..lol
Omgosh..pulling the plug of the gaming habits ? :o ...i would like too ...but its the holiday season for me now...so playing somehow comes to my mind :X ...and yes i am still a kid...( okok...a young teenager)

Posted 10 months ago #
agi
Member

hehe.. that's understandable :-) there's still a kid inside of me too, just can't find the time to play like i did before (like playing freeciv up until the roosters crow). oh, those were the times..

so anything on the logs? i'm interested to see if some segfaults also occur in your setup.

Posted 10 months ago #
fplolz
Member

i am not too sure if theres a log ..cause i have to alt magic sys req key after the crash..or hang

hm...i will try to see if there is ..

Edit : there doesnt seem to be any errors...do you have any idea where to look at?
i was looking through the everything log

Posted 10 months ago #
agi
Member

after a hang and a reboot.. check the /var/log/messages, something should be on there before the startup messages start. The times should coincide with the approximate time the crash occurred.. Or send (eijhei<at>gmail.com) me a copy of /var/log/message after a crash+reboot..

Posted 10 months ago #
fplolz
Member

I have sent the message.log
the one i got after a crash + reboot

thanks for your help (:

Posted 10 months ago #
agi
Member

i read through the log.. it seems the kernel doesn't flag anything occurring as weird during the crash, no seg faults or even memory access faults. does the kb or mouse become unresponsive during the crash, and does the graphics also stop moving (assuming you're trying to play a game)..

Posted 10 months ago #
agi
Member

also try to look for some logs of the game itself..

Posted 10 months ago #
agi
Member

alternatively try running the game on the shell with stdout/stderr redirection..

$ 'game' 2&> 'log'

Posted 10 months ago #
fplolz
Member

hm...only the mouse and graphics along with the sound become unresponsive.
the sound kinda ;...um like repeats itself on the part where it hangs.. over and over again

i will try running the game on the shell soon when i get back home

thanks for your help :D

Posted 10 months ago #
fplolz
Member

i tried the game log ...and yes it was as per normal..no errors shown ..

on there hand , i realised , it was only my usb ( tried ps/2 mouse too) mouse not responding..
the cursor was kinda stuck there..

Managed to check the log through the terminal...
Another funny thing was ...
after issueing the shutdown command from gnome shutdown button(using keyboard shortcuts )
upon restart , it told the super block or somthing like that was written in the future...roughly bout 1 day ahead of the system's time ...

Any ideas ? :x

yours truely
a very puzzuled kid

Ps : it somehow leads me to think that the realtime somehow screws the way the kernel deals with the hardware...

Posted 10 months ago #
agi
Member

yup.. i heard about that too from others. something to do with tickless setup or something. i'm not well versed at it too right. but that will change :-) hehe..

i'm taking my time on my migrating my systems and blogging my adventures as it relates to my work here. hope you'll be patient with me while i do that..

back on the issue.. this topic (realtime vs. low-latency) has been a hot topic on the kernel since con kolivas entered with his patches :-) on my excursions on virtualizations i also noticed this clock problems and hadn't found a real reasonable explanation why..

Posted 10 months ago #
fplolz
Member

Hey :D thanks alot
really appreciate your help...

wil try picking up a few more things about kernels on google...

i really gotta sit down one of these days and start learning seriously bout all this stuff.

Posted 10 months ago #
hassad
Member

Lots of people have similar problems with video freezing, and while most of them seem to be solved by getting the right video card drivers installed, most of them are running XP, so if this is a Vista compatibility problem, then video card drivers may not be of any help to you.

Here are the results of a forum search for "video freeze". Hopefully something in there will help you.

good luck,

Posted 3 months ago #
hassad
Member

Lots of people have similar problems with video freezing, and while most of them seem to be solved by getting the right video card drivers installed,

http://discountedzhuhamsterpets.com/1/zhu-zhu-pets

Posted 3 months ago #

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