From mboxrd@z Thu Jan  1 00:00:00 1970
From: Harald Welte <laforge@gnumonks.org>
Subject: Re: packet re-ordering on SMP machines.
Date: Sun, 15 Sep 2002 10:42:01 +0200
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To: Andi Kleen <ak@suse.de>
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On Tue, Aug 27, 2002 at 03:13:17PM +0200, Andi Kleen wrote:
>=20
> On Tue, Aug 27, 2002 at 05:06:30PM +0400, A.N.Kuznetsov wrote:
> > Hello!
> >=20
> > > Of course. The only problem is that the clock can be non mononotonous=
=20
> > > sometimes and not be in sync with gettimeofday, but at least the kern=
el=20
> > > users of packet timestamps do not care.
> >=20
> > What kernel users? Where did you find them? :-)
>=20
> Hmm, I thought TCP used it, but it seems to use jiffies directly.
>=20
> Ok, no kernel users then. Not sure about sunrpc and out of tree stuff
> like SCTP.

The iptables ULOG target passes the skb receive timestamp to userspace, whe=
re
it is (depending on local ulogd configuration) written in logging/accounting
databases. (ULOG is in the kernel tree).=20=20

The issue is that ULOG is batching multiple packets (or parts of packets) i=
nto
one netlink message sent to userspace.  If userspace would make a timestamp,
it would be very inaccurate.

There is at least one more iptables extension (out of the kernel tree) using
it - but I wouldn't consider this as important.

> -Andi

--=20
Live long and prosper
- Harald Welte / laforge@gnumonks.org               http://www.gnumonks.org/
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