From: Jeff Garzik <jgarzik@pobox.com>
To: Joakim Tjernlund <Joakim.Tjernlund@lumentis.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: NETIF_F_SG question
Date: Sat, 01 Feb 2003 12:40:20 -0500 [thread overview]
Message-ID: <3E3C0684.4010806@pobox.com> (raw)
In-Reply-To: <004701c2ca03$cb467460$020120b0@jockeXP>
Joakim Tjernlund wrote:
> I am thinking of implementing harware scatter/gatter support( NETIF_F_SG) in my
> ethernet driver. The network device cannot do HW checksuming.
>
> Will the IP stack make use of the SG support and will there be any significant performance
> improvement?
No; you need HW checksumming for NETIF_F_SG to be useful.
If HW checksumming is not available, scatter-gather is useless, because
the net stack must always make a pass over the data to checksum it.
Since it must do that, it can linearize the skb at the same time,
eliminating the need for SG.
Jeff
next prev parent reply other threads:[~2003-02-01 17:33 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 [this message]
2003-02-01 18:42 ` Joakim Tjernlund
2003-02-01 19:16 ` romieu
2003-02-01 22:16 ` Joakim Tjernlund
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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