On Mon, 2004-08-23 at 17:01, Ingo Molnar wrote:
> i've uploaded the -P8 patch:
> 
> http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P8
> 
> Changes since -P8:
> 
>  - fixes the DRI/DRM latency in radeon (and other drivers). The concept 
>    was investigated/tested by Dave Airlie.
> 
>  - reduce netdev_max_backlog to 8 (Mark H Johnson)


With -P8 I have not seen a latency over 100 usecs yet.  The most common
latencies are those involving zap_pte_range, journal_get_undo_access and
netdev_process_backlog (even with netdev_max_backlog set to 4).

Traces:

http://krustophenia.net/testresults.php?dataset=2.6.8.1-P8

Lee

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