From: "Joakim Tjernlund" <Joakim.Tjernlund@lumentis.se>
To: <romieu@fr.zoreil.com>
Cc: "Jeff Garzik" <jgarzik@pobox.com>, <linux-kernel@vger.kernel.org>
Subject: Re: NETIF_F_SG question
Date: Sat, 1 Feb 2003 23:16:45 +0100 [thread overview]
Message-ID: <006f01c2ca3f$9b691220$020120b0@jockeXP> (raw)
In-Reply-To: 20030201201627.A25670@electric-eye.fr.zoreil.com
> Joakim Tjernlund <Joakim.Tjernlund@lumentis.se> :
> [...]
> > Surley the copy operation will cost something?
>
> Cost is hidden while checksumming.
>
> --
> Ueimor
Yes, I realize that you can make the cost much smaller by checksumming and
copying at the same time. However for every word that is checksummed one must
execute an extra store. That store will also hit the L1 cache, flushing more
important data to memory, so maybe the cost is visible?
Jocke
next prev parent reply other threads:[~2003-02-01 22:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-01 15:08 NETIF_F_SG question Joakim Tjernlund
2003-02-01 17:40 ` Jeff Garzik
2003-02-01 18:42 ` Joakim Tjernlund
2003-02-01 19:16 ` romieu
2003-02-01 22:16 ` Joakim Tjernlund [this message]
2003-02-02 1:39 ` Joakim Tjernlund
2003-02-03 21:18 ` Ion Badulescu
2003-02-03 22:22 ` Joakim Tjernlund
2003-02-03 22:34 ` Ion Badulescu
2003-02-03 22:44 ` Joakim Tjernlund
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