[Bug 251492] New: Background tasks should run with idle IO scheduling priority

[Michael Schuerig]

https://bugs.kde.org/show_bug.cgi?id=251492

           Summary: Background tasks should run with idle IO scheduling
                    priority
           Product: kde
           Version: unspecified
          Platform: Debian unstable
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: michael at schuerig.de


Version:           unspecified (using KDE 4.4.5) 
OS:                Linux

KDE runs several background tasks that are not related to actions a user might
trigger and for whose completion they wait. Still, these tasks can take up
considerable resources and thereby even delay other tasks.

Notable offenders are http_cache_cleaner and virtuoso. Particularly after login
these task can drive the load so high that the system becomes effectively
unusable for a couple of minutes.

I consider this not just a desirable enhancement, but a downright performance
bug.

The cure? Setting the IO scheduling priority of these tasks to idle results in
a considerable improvement.

Reproducible: Didn't try

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