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

[Lee Revell]

On Mon, 2004-08-23 at 17:01, Ingo Molnar wrote:

>  - reduce netdev_max_backlog to 8 (Mark H Johnson)
> 

On my system this setting has absolutely no effect on the skb related
latencies.  I tested setting netdev_max_backlog to every power of two 
between 1 and 128, and regardless of this setting, I can produce a
450-600 usec latency with:

ping -s 65507 -f $DEFAULT_GATEWAY

Looks like skb_checksum is the problem.  Here is one of the traces:

http://krustophenia.net/testresults.php?dataset=2.6.8.1-P8#/var/www/2.6.8.1-P8/trace14.txt

Lee

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