This is a stress test, it creates 4 processes and each process will do 1000 transfers using streams, so the trace is: STRM_Issue -> WMD_CHNL_AddIOReq -> IO_Schedule IO_Schedule schedules a call to IO_DPC using task let. IO_DPC -> IO_DispatchChnl -> InputChnl -> CHNLSM_InterruptDSP2 Also IO_DispatchChnl -> OutputChnl -> CHNLSM_InterruptDSP2. As we can call a lot CHNLSM_InterruptDSP2 in this test, there is a problem with the timeout. However running other tests, videos and mp3 there no problems. I think we should change to 10ms, only to make sure there is no problem when CHNLSM_InterruptDSP2 is called a lot. Let me know if you are agreed. Or have some comments about it. Regards, Fernando. -----Original Message----- From: Felipe Contreras [mailto:felipe.contreras@xxxxxxxxx] Sent: Thursday, March 19, 2009 3:35 PM To: Guzman Lugo, Fernando Cc: linux-omap@xxxxxxxxxxxxxxx; Kanigeri, Hari; Hiroshi DOYU; Ameya Palande; Felipe Contreras Subject: Re: [PATCH B 3/3] tidspbridge: decreate timeout to a saner value On Thu, Mar 19, 2009 at 11:19 PM, Guzman Lugo, Fernando <x0095840@xxxxxx> wrote: > > Yes, I applied this; in fact I have applied all the patches. If I increase the timeout there are no problems. The test I run creates 4 process and each one does several a lot of calls to InputChnl and OutputChnl, so I think this test is using the mailbox a lot and would be better a bigger timeout. What do you think? How fast are these messages sent? Can you track down which functions are calling CHNLSM_InterruptDSP2 and making these timeouts happen. I think it's safe to leave the timeout at 10, but that means it's possible the code will be busy-looping up to 10 ms which will increase the CPU load. Somebody from Nokia (Siarhei?) suggested to idle-wait for the mbox empty irq, I think that's the best way to implement this, but at least for the use cases I'm interested in (video encoding/decoding) timeouts don't seem to be an issue anymore. -- Felipe Contreras -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
