[Issue 1001684] New: Cyg_RealTimeClock::dsr is taking too much time

[Issue 1001684] New: Cyg_RealTimeClock::dsr is taking too much time

[bugzilla-daemon]

Please do not reply to this email. Use the web interface provided at:
https://bugzilla.ecoscentric.com/show_bug.cgi?id=1001684

           Summary: Cyg_RealTimeClock::dsr is taking too much time
           Product: eCos
           Version: 2.0
          Platform: Custom (Customer specific)
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: normal
          Priority: normal
         Component: Kernel
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: fserban@dover-pidg.com
         QAContact: ecos-bugs@ecos.sourceware.org
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


Hello,

When Jonathan and Alex visited us last week, we discussed about one of our
problem.
We want to be determinastic with a high priority task that is woken up by a
timer DSR (by posting a semaphore)

The problem we are facing is that, sometimes the task is not awaken quickly
enough. There are some delay.

By using our debugger, I've seen that it is because Cyg_RealTimeClock::dsr
raises and takes too much time (I've attached the trace chart taken from our
debugger)

In this attached screenshot, we see that we spent mainly time in
Cyg_RealTimeClock::dsr and in Cyg_ThreadTimer::alarm

In our current source code,  we created one alarm (QF_alarm_handler) an we may
create a second one.

The question is, is it possible to put all the code in Cyg_RealTimeClock::dsr
in a task with a lower priority than our timer task, and only wake up this task
in the new Cyg_RealTimeClock::dsr?

Or maybe, you have some other advice to better fit our need?

Thank you!
Anthony

PS: eCos options: 
- CYGIMP_KERNEL_COUNTERS_SINGLE_LIST
- CYGIMP_KERNEL_COUNTERS_SORT_LIST is not defined

-- 
Configure issuemail: https://bugzilla.ecoscentric.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the issue.

[Issue 1001684] Cyg_RealTimeClock::dsr is taking too much time

[bugzilla-daemon]

Please do not reply to this email. Use the web interface provided at:
https://bugzilla.ecoscentric.com/show_bug.cgi?id=1001684

--- Comment #1 from Serban <fserban@dover-pidg.com> 2012-10-10 10:56:55 BST ---
Created an attachment (id=1955)
 --> (https://bugzilla.ecoscentric.com/attachment.cgi?id=1955)
trace screenshot

-- 
Configure issuemail: https://bugzilla.ecoscentric.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the issue.

[Issue 1001684] Cyg_RealTimeClock::dsr is taking too much time

[bugzilla-daemon]

Please do not reply to this email. Use the web interface provided at:
https://bugzilla.ecoscentric.com/show_bug.cgi?id=1001684

Paul Beskeen <paulb@ecoscentric.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |paulb@ecoscentric.com
         AssignedTo|ecc-bugs-int@ecoscentric.co |jifl@ecoscentric.com
                   |m                           |

-- 
Configure issuemail: https://bugzilla.ecoscentric.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the issue.

[Issue 1001684] Cyg_RealTimeClock::dsr is taking too much time

[bugzilla-daemon]

Please do not reply to this email. Use the web interface provided at:
https://bugzilla.ecoscentric.com/show_bug.cgi?id=1001684

--- Comment #1 from Serban <fserban@dover-pidg.com> 2012-10-10 10:56:55 BST ---
Created an attachment (id=1955)
 --> (https://bugzilla.ecoscentric.com/attachment.cgi?id=1955)
trace screenshot

-- 
Configure issuemail: https://bugzilla.ecoscentric.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the QA contact for the issue.
You are on the CC list for the issue.