linux-kernel - Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

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Message-Id: <20060919.124751.24100694.davem@davemloft.net>
Date:	Tue, 19 Sep 2006 12:47:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kuznet@....inr.ac.ru
Cc:	master@...torb.msk.ru, ak@...e.de, hawk@...u.dk,
	harry@...os.washington.edu, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

From: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Date: Tue, 19 Sep 2006 02:00:38 +0400

> * I do not undestand what the hell dhcp needs timestamps for.

I can't even find a reference to SIOCGSTAMP in the
dhcp-2.0pl5 or dhcp3-3.0.3 sources shipped in Ubuntu.

But I will note that tpacket_rcv() expects to always get
valid timestamps in the SKB, it does a:

	if (skb->tstamp.off_sec == 0) { 
		__net_timestamp(skb);
		sock_enable_timestamp(sk);
	}

so that it can fill in the h->tp_sec and h->tp_usec
fields.
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