drm on i965GM is very sluggish

[Steve Kargl]

Kernel and world are from today sources.  If I start firefox3,
redraws become painfully slow.  Top(1) shows

last pid: 22285;  load averages:  0.06,  0.06,  0.02    up 0+20:53:52  19:14:55
52 processes:  1 running, 51 sleeping
CPU:  0.0% user,  0.0% nice,  0.4% system,  0.0% interrupt, 99.6% idle
Mem: 123M Active, 15M Inact, 170M Wired, 5228K Cache, 110M Buf, 671M Free
Swap: 1024M Total, 8K Used, 1024M Free

  PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
22281 kargl         8  96    0 59440K 39328K ucond   0   0:01  7.81% firefox-bi
22190 kargl         1  96    0   286M   270M drmwtq  1   0:13  2.20% Xorg

REMOVE:kargl[33] dmesg | grep drm
drm0: <Intel i965GM> on vgapci0
info: [drm] MSI enabled 1 message(s)
vgapci0: child drm0 requested pci_enable_busmaster
info: [drm] AGP at 0xe0000000 256MB
info: [drm] Initialized i915 1.6.0 20080730
drm0: [ITHREAD]
error: [drm:pid1757:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
drm0: [ITHREAD]
error: [drm:pid21228:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled pipe 0
drm0: [ITHREAD]

-- 
Steve