[hafqa] [hafqa] [Bug 2838] New: Transfers speeds to MMC/SD cards is very low on N800 with OS2008

[From: bugzilla-daemon at lists.maemo.org]

https://bugs.maemo.org/show_bug.cgi?id=2838

           Summary: Transfers speeds to MMC/SD cards is very low on N800
                    with OS2008
           Product: System software
           Version: 4.0
          Platform: All
               URL: http://intr.overt.org/blog/?p=66
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Low
         Component: mmc-and-usb
        AssignedTo: kimmo.hamalainen at nokia.com
        ReportedBy: maemobugs.philipl at overt.org
         QAContact: mmc-and-usb-bugs at maemo.org


SOFTWARE VERSION:
2.2007-50

STEPS TO REPRODUCE THE PROBLEM:
Try and read from an MMC or SD card

EXPECTED OUTCOME:
Transfer rates above 4.5MB/s

ACTUAL OUTCOME:
Transfer rates of about 4.5MB/s

REPRODUCIBILITY:
always

EXTRA SOFTWARE INSTALLED:
modest

OTHER COMMENTS:
With os2007, I benchmarked a number of cards and was getting transfer rates
exceeding 7MB/s and with my 48MHz patch, I could hit 13MB/s. Now, with OS2008,
all these cards are transfering at about 4.5MB/s.

Amazingly, if load is placed on the CPU, the transfer rate actually increases -
I've seen it go back up over 7MB/s with the right amount of load.

Seems like a problem with the cpu power saving logic. It's not speeding up to
cope with the data transfer.


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