Re: [ts-7000] Avoiding task preemption by Linux kernel

[Clark Dunson <>]

I am also interested, thanks.

Does anybody know whether compiling the main interrupt to use a slower speed,

and/or using nice or renice to set the scheduling priority like -19, or -20 will make 

much of a difference?

On Aug 12, 2011, at 4:17 PM, Walter Marvin wrote:

 

you can't avoid technologic has a user space semaphore that they test and force a tack switch if required the only way to avoid it is to down all technologic servers

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From: tourindorian <>
To: m("yahoogroups.com","ts-7000");">
Sent: Friday, August 12, 2011 9:04 AM
Subject: [ts-7000] Avoiding task preemption by Linux kernel

 

Hi,

I'm developing an application (C code) on the TS7550 board, using Linux 2.6. I got an issue trying to use continuously the SPI bus for 20ms.
Every 10ms, the communication is interrupted during about 0.5ms. I guess the Kernel scheduler interrupts the process.

Do you have any idea to fix it? Could I change the tick rate of the scheduler so that it is about 50 or 100ms instead of 10ms? Could I prevent the Kernel from preempting the task during that critical section?

Any idea would be useful :-)

Many thanks,

Dorian.

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