UART console based on interrupt

[John Pickwick]

Through the classical CPU_DumpUsage function call. Sometimes you need to reset the statitistics otherwise the wrapped counter gives wrong figures.

In my case of interrupt driven io I expected to get a lower CPU usage by the console task since I assumed it wakes up only "when there is something to process".  This is not the case, the figure is the same as with the polled version. :=(

John.
  ----- Original Message ----- 
  From: Grigori Khmyrov 
  To: rtems-users at rtems.org 
  Sent: Thursday, July 19, 2007 3:42 PM
  Subject: Re: UART console based on interrupt


  John,

  Can you please share or point to how do you measure CPU usage.

  Thank you,
  Grigori

  John Pickwick wrote:

    Hi to all,

    I recently re-compiled my SparcLEON2 BSP / RTEMS4.7.1 using the USE_CONSOLE_INTERRUPT macro and I compared the CPU usage with the default BSP version that uses polled UART.
    I have a task waiting on console input with getchar and I expected the interrupt driven version of the console to be less CPU consuming. Unfortunately I find the same CPU usage percentage for that one.

    Can someone explain this ? 

    Best regards,

    John
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