Re: [Lse-tech] Re: (RFC): SKB Initialization

From: Mala Anand (
Date: Fri Aug 23 2002 - 18:14:26 EST

Rick wrote..
>Note that Mala said "I measured the cycles for only the
>initialization code in alloc_skb and __kfree_skb" which could mean that
>even other parts of alloc_skb() or __kfree_skb() may have gotten worse
>and you would not have known.
 Please look at my reply to Ben LeHaise which has the cycles for
 alloc_skb() and __kfree_skb(). You don't have to guess that.

> Later she admits, "As the scope of the
>code measured widens the percentage improvement comes down" and finally
>observes "We measured it in a web serving workload and found that we
>get 0.7% improvement" which is practically in the noise.
That was initial results which had more than the posted patch. We are
still working on getting numbers.

>observation was that it was slightly worse (0.35%).
Are you basing this 0.35% degradation on your profile. According to
Dave's SPECweb99 results there is a 2.97% improvement in simultaneous
connections with my patch. Is that right Dave?


   Mala Anand
   IBM Linux Technology Center - Kernel Performance
   Phone:838-8088; Tie-line:678-8088

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