From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264309AbTKZVey (ORCPT ); Wed, 26 Nov 2003 16:34:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264334AbTKZVey (ORCPT ); Wed, 26 Nov 2003 16:34:54 -0500 Received: from node-d-1fcf.a2000.nl ([62.195.31.207]:14987 "EHLO laptop.fenrus.com") by vger.kernel.org with ESMTP id S264309AbTKZVew (ORCPT ); Wed, 26 Nov 2003 16:34:52 -0500 Subject: Re: Fire Engine?? From: Arjan van de Ven Reply-To: arjanv@redhat.com To: "David S. Miller" Cc: Andi Kleen , linux-kernel@vger.kernel.org In-Reply-To: <20031126113040.3b774360.davem@redhat.com> References: <20031125183035.1c17185a.davem@redhat.com.suse.lists.linux.kernel> <20031126113040.3b774360.davem@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-AfvByX5m7dtelqx36vds" Organization: Red Hat, Inc. Message-Id: <1069882450.5219.1.camel@laptop.fenrus.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7) Date: Wed, 26 Nov 2003 22:34:10 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --=-AfvByX5m7dtelqx36vds Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2003-11-26 at 20:30, David S. Miller wrote: > > - Doing gettimeofday on each incoming packet is just dumb, especially > > when you have gettimeofday backed with a slow southbridge timer. > > This shows quite badly on many profile logs. > > I still think right solution for that would be to only take time stamps > > when there is any user for it (=3D no timestamps in 99% of all systems)= =20 >=20 > Andi, I know this is a problem, but for the millionth time your idea > does not work because we don't know if the user asked for the timestamp > until we are deep within the recvmsg() processing, which is long after > the packet has arrived. question: do we need a timestamp for every packet or can we do one timestamp per irq-context entry ? (eg one timestamp at irq entry time we do anyway and keep that for all packets processed in the softirq) --=-AfvByX5m7dtelqx36vds Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQA/xRxSxULwo51rQBIRAgC3AKCWFd5plGl3bRxwRWGFp3KLOa4angCdGfjs aJFAxz3ugdodxVGZ+oHo6ZY= =Kx1O -----END PGP SIGNATURE----- --=-AfvByX5m7dtelqx36vds--