[Intel-gfx] high number of wakeups/second shown with 2.5 branch
eric at anholt.net
Mon Oct 20 09:41:22 PDT 2008
On Mon, 2008-10-20 at 08:29 +0200, Tino Keitel wrote:
> after I switched to the pre-2.5 driver, I often see a high number of
> wakeups/second like this:
> Top causes for wakeups:
> 76.7% (1268.1) <interrupt> : i915 at pci:0000:00:02.0
> 16.3% (269.4) <kernel IPI> : Rescheduling interrupts
> 5.2% ( 85.5) <interrupt> : PS/2 keyboard/mouse/touchpad
> 0.8% ( 13.6) <interrupt> : extra timer interrupt
> 0.2% ( 3.1) <kernel IPI> : function call interrupts
> 0.2% ( 3.1) firefox-bin : futex_wait (hrtimer_wakeup)
> 0.1% ( 1.5) Xorg : schedule_timeout (process_timeout)
> This wasn't the case with the 2.4 driver. Currently, I use the version
> 2.4.98 on the ThinkPad X61s with i965.
> Is there a specific reason for this behaviour with the 2.5 branch?
Without knowing your specific workload it's hard to tell if there's a
problem or not, but we've replaced busy-waiting with using interrupts in
the 2d driver.
eric at anholt.net eric.anholt at intel.com
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