[wdmaudiodev] Re: WavePciStream runs out of mappings
- From: Markus Bollinger <bollinger@xxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 21 Feb 2012 14:22:57 +0100
Thank you Eugene for your idea.
I already did some first test. In case of my multi - waveminiport
implementation restricting everything to CPU 0 is not very good for
performance and increases the risc of glitches.
Perhaps each miniport should use a different CPU (if available), but would
this still fix the issue/problem/bug ?
When should the affinity restriction be canceled ? at
SetState(KSSTATE_STOP) ?
I don't think that there is a multi-core related bug in WavePCI sample
code, so this would mean that this fix avoids a problem somewhere in a
upper kernel or user space layer of the audio stack. Or do you have another
explanation why this should/could fix the issue ? Perhaps related to the
fact that you need a KeReleaseSpinLock before calling
PortStream->GetMapping or PortStream->ReleaseMapping ?
Thank you again and best regards.
Markus.
2012/2/20 Eugene Muzychenko <eugene@xxxxxxxxxxxxxx>
> Hello Markus,
>
> > But changing driver architecture or implementing my own streaming
> interface
> > is not really a solution that I expected to do....
>
> The only solution I have found for PortCls is to restrict affinity of
> the thread providing IOCTL_KS_READ_STREAM/IOCTL_KS_WRITE_STREAM IRPs
> to a single CPU (for example, CPU 0). Processing these IRPs, PortCls
> calls MappingAvailable so you can insert affinity restriction code
> into this function. Don't forget to save thread ID to an internal
> list/array to avoid calling affinity set functions every time.
>
> Regards,
> Eugene
>
> ******************
>
> WDMAUDIODEV addresses:
> Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
> Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
> Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
> Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
>
> URL to WDMAUDIODEV page:
> http://www.wdmaudiodev.com/
>
>
Other related posts:
