[Bug 267297] New: bad RAID disk performance

[wbrana at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=267297

           Summary: bad RAID disk performance
           Product: kde
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: wbrana at gmail.com


Version:           unspecified (using KDE 4.6.0) 
OS:                Linux

KDE is badly affecting performance of RAID10. 
dd is reading disk with speed 353 MB/s if system is booted with non-KDE e.g.
IceWM.
If KDE is started, speed drops to approx. 180-190 MB/s. 
Any disk operations are obviously slower. 
Logout from KDE, don't restore speed.



Reproducible: Didn't try

Steps to Reproduce:
echo 3 > /proc/sys/vm/drop_caches
dd if=/dev/md2 of=/dev/null bs=4M count=128

Actual Results:  
128+0 records in
128+0 records out
536870912 bytes (537 MB) copied, 2.94772 s, 182 MB/s

Expected Results:  
128+0 records in
128+0 records out
536870912 bytes (537 MB) copied, 1.52247 s, 353 MB/s

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