Re: [patch] voluntary-preempt-2.6.8.1-P8

Lee Revell
2004-08-23T23:47:14Z

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