From: Wei Yongjun <[EMAIL PROTECTED]>
Date: Thu, 03 Aug 2006 11:46:58 -0400
> I modified my patch by add a flag to sacked when retransmit, and it
> work well.
This is the most timing critical code path of the TCP stack output
packet processing, and you're adding a read-modify-write operation
just to get some statistics correct.
Let's look for a cheaper test, perhaps something like:
if (!before(TCP_SKB_CB(skb)->seq, tp->snd_nxt))
TCP_INC_STATS(TCP_MIB_OUTSEGS);
Would that work?
It should, because tp->snd_nxt always advances on new data
via update_send_head().
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