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Forum Topic - x86 procnto-smp / bmp scheduling error:

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Matthias Ecker

12/09/2011 3:24 AM

post90495

x86 procnto-smp / bmp scheduling error

Hi,

I wonder if anybody else saw problems like that before: 

high priority processes are attached to an interrupt and forwarding the events using another mechnism (condvars). low 
priority processes are executing systemcalls like creating new processes (fork). 
In some situations a high priority process is scheduled ready, though is not allowed to run and another process with 
lower priority is still running (sometimes this is the idle thread). 
The error occurs fairly often in a bound multicore environment. 

Anyone saw that before? Or is using smp / bmp in a way like that? 

Cheers!
Matthias

Attachment:

qnx_bmp_error.png 28.6 KB

Alexander Koppel

12/14/2011 10:08 AM

post90615

RE: x86 procnto-smp / bmp scheduling error

This looks like a known issue to be fixed in the next release.

-----Original Message-----
From: Matthias Ecker [mailto:community-noreply@qnx.com] 
Sent: December-09-11 3:24 AM
To: ostech-core_os
Subject: x86 procnto-smp / bmp scheduling error

Hi,

I wonder if anybody else saw problems like that before: 

high priority processes are attached to an interrupt and forwarding the events using another mechnism (condvars). low 
priority processes are executing systemcalls like creating new processes (fork). 
In some situations a high priority process is scheduled ready, though is not allowed to run and another process with 
lower priority is still running (sometimes this is the idle thread). 
The error occurs fairly often in a bound multicore environment. 

Anyone saw that before? Or is using smp / bmp in a way like that? 

Cheers!
Matthias

_______________________________________________

OSTech
http://community.qnx.com/sf/go/post90495

Matthias Ecker

12/15/2011 4:05 AM

post90641

Re: RE: x86 procnto-smp / bmp scheduling error

will it seriously be a part of the next release or one of the following releases? 
When is the next release?

Cheers!
Matthias

Alexander Koppel

12/15/2011 10:15 AM

post90645

RE: RE: x86 procnto-smp / bmp scheduling error

Note that depending on support plan you may be entitled to experimental or priority patches. Please talk to your sales 
or support contact.

-----Original Message-----
From: Matthias Ecker [mailto:community-noreply@qnx.com] 
Sent: December-15-11 4:06 AM
To: ostech-core_os
Subject: Re: RE: x86 procnto-smp / bmp scheduling error

will it seriously be a part of the next release or one of the following releases? 
When is the next release?

Cheers!
Matthias

_______________________________________________

OSTech
http://community.qnx.com/sf/go/post90641

Matthias Ecker

12/16/2011 3:40 AM

post90658

Re: RE: RE: x86 procnto-smp / bmp scheduling error

done that, we're through that mess... 

don't get me wrong. QNX is a real good product and toolchain. As long as everything is properly working and there are no
 bugs. Whenever something is really wrong, the support is good in trying to find a workaround. In case there is no 
workaround, your're doomed. Never saw a customer unfriendly company like qnx, before!

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