From: Joe Malicki <jmalicki@metacarta.com>
To: David Miller <davem@davemloft.net>
Cc: andi@firstfloor.org, johnpol@2ka.mipt.ru, dada1@cosmosbay.com,
denys@visp.net.lb, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, juhlenko@akamai.com,
sammy@sammy.net
Subject: Re: loaded router, excessive getnstimeofday in oprofile
Date: Thu, 28 Aug 2008 02:28:12 -0400 (EDT) [thread overview]
Message-ID: <21915755.1327801219904892242.JavaMail.root@ouachita> (raw)
In-Reply-To: <20080827.201020.17601834.davem@davemloft.net>
----- "David Miller" <davem@davemloft.net> wrote:
>
> Every application using AF_PACKET sockets gets timestamps by
> default. And we do know of several specific cases where the
> timestamps are unnecessary.
>
> Even for other cases, why in the world does a DHCP client need
> accurate timestamps? Give me a break. :)
>
I've worked with systems where SO_TIMESTAMP has been used for
H.323 videoconferencing systems to synchronize audio and video
where remote systems' timestamps on the protocol streams proved
to be inaccurate (based off of different, unsynchronized clocks).
I can't see any other realistic use of this, but trying to get
timestamps for quasi-realtime protocols may be an important use
case - and in that case, you want the time when it hits the
interface, NOT when it hits the socket.
What utility does the time of hitting the socket get you?
next prev parent reply other threads:[~2008-08-28 6:46 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-22 1:57 loaded router, excessive getnstimeofday in oprofile Denys Fedoryshchenko
2008-08-22 2:23 ` Denys Fedoryshchenko
2008-08-26 9:51 ` Jarek Poplawski
2008-08-26 10:29 ` Denys Fedoryshchenko
2008-08-26 10:47 ` Jarek Poplawski
2008-08-26 10:49 ` Denys Fedoryshchenko
2008-08-26 11:07 ` Jarek Poplawski
2008-08-26 11:15 ` Jarek Poplawski
2008-08-26 11:16 ` Denys Fedoryshchenko
2008-08-26 11:32 ` Jarek Poplawski
2008-08-26 11:32 ` Denys Fedoryshchenko
2008-08-26 20:14 ` Evgeniy Polyakov
2008-08-26 20:44 ` Eric Dumazet
2008-08-26 20:51 ` Evgeniy Polyakov
2008-08-27 12:09 ` Denys Fedoryshchenko
2008-08-27 12:36 ` Evgeniy Polyakov
2008-08-27 14:00 ` Denys Fedoryshchenko
2008-08-27 14:23 ` Evgeniy Polyakov
2008-08-27 12:54 ` Andi Kleen
2008-08-27 16:07 ` Rick Jones
2008-08-27 16:27 ` Andi Kleen
2008-08-27 16:49 ` Rick Jones
2008-08-27 16:56 ` Andi Kleen
2008-08-27 16:57 ` Rick Jones
2008-08-27 17:27 ` Eric Dumazet
2008-08-27 18:32 ` loaded router, excessive getnstimeofday in oprofile\ Andi Kleen
2008-08-27 22:23 ` David Miller
2008-08-27 22:38 ` Andi Kleen
2008-08-27 22:18 ` loaded router, excessive getnstimeofday in oprofile David Miller
2008-08-27 22:39 ` Andi Kleen
2008-08-28 0:45 ` Nick Piggin
2008-08-28 0:48 ` David Miller
2008-08-28 1:07 ` Nick Piggin
2008-08-27 16:17 ` Stephen Hemminger
2008-08-27 17:14 ` Jarek Poplawski
2008-08-27 21:34 ` David Miller
2008-08-28 2:39 ` Jason Uhlenkott
2008-08-28 3:10 ` David Miller
2008-08-28 6:28 ` Joe Malicki [this message]
2008-08-28 7:22 ` Andi Kleen
2008-08-28 15:02 ` Denys Fedoryshchenko
2008-08-28 19:01 ` Ilpo Järvinen
2008-08-28 19:31 ` David Miller
2008-08-28 16:48 ` Denys Fedoryshchenko
2008-08-28 16:56 ` Andi Kleen
2008-08-28 18:57 ` Eric Dumazet
2008-08-28 19:25 ` Denys Fedoryshchenko
2008-08-28 19:37 ` Eric Dumazet
2008-08-28 19:55 ` Denys Fedoryshchenko
2008-08-29 15:43 ` Stephen Hemminger
2008-08-28 19:36 ` David Miller
2008-08-28 19:59 ` Denys Fedoryshchenko
2008-08-29 15:21 ` Joe Malicki
2008-08-29 15:30 ` Andi Kleen
2008-08-29 15:43 ` Joe Malicki
2008-08-29 20:43 ` Evgeniy Polyakov
2008-08-28 18:00 ` Rick Jones
2008-08-28 19:42 ` David Miller
2008-08-28 20:29 ` Rick Jones
2008-08-28 20:32 ` David Miller
2008-08-28 20:45 ` Rick Jones
2008-08-28 20:47 ` David Miller
2008-09-01 2:39 ` Valdis.Kletnieks
2008-09-01 3:51 ` David Miller
2008-09-01 4:08 ` Valdis.Kletnieks
2008-09-01 4:10 ` David Miller
2008-09-02 17:04 ` Rick Jones
2008-08-28 3:35 ` Stephen Hemminger
2008-08-28 8:49 ` Denys Fedoryshchenko
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