scheduling problems in X with 2.6.0

[martin f krafft <madduck@madduck.net>]

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Hi all,

Ever since I moved to 2.6.0, I have been experiencing something I'd
like to call scheduling problems while working in X. I have tried
using preemptive mode, and turning it off, but the symptoms are the
same:

whenever there is continuous disk access (e.g. tar, rsync, dd),
X will not respond for a couple of seconds every couple of seconds.
With that I mean that the mouse will freeze as well as all screen
output, and then resume after a couple of seconds.

I wonder if I am the only one with that problem. The machine in
question is a dual AMD 2400+ with 2Gb of RAM and a Maxtor DiamondMax
drive spinning at 7200 RPM. The drive is configured as follows
(hdparm):

 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 16383/255/63, sectors = 241254720, start = 0
 Model=IC35L120AVV207-0, FwRev=V24OA63A, SerialNo=VNVD06G4C1NXZL
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
 BuffType=DualPortCache, BuffSize=1821kB, MaxMultSect=16, MultSect=16
 CurCHS=65535/1/63, CurSects=4128705, LBA=yes, LBAsects=241254720
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a: 

I would appreciate any pointers to the source of the problem, or
general hints!

-- 
martin;              (greetings from the heart of the sun.)
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