From: "Dennis Cook" <cook@sandgate.com>
To: linux-kernel@vger.kernel.org
Cc: kernelnewbies@nl.linux.org
Subject: Re: Deactivating TCP checksumming
Date: Wed, 2 Apr 2003 15:47:35 -0500 [thread overview]
Message-ID: <b6fi8m$j4g$1@main.gmane.org> (raw)
In-Reply-To: 20030402203653.GA2503@gtf.org
What I was looking for is a general capability to keep the SW transport
stack from
computing outgoing TCP/UDP/IP checksums so that the HW can be allowed to do
it,
similar to Windows checksum offload capability.
"Jeff Garzik" <jgarzik@pobox.com> wrote in message
news:20030402203653.GA2503@gtf.org...
> On Wed, Apr 02, 2003 at 02:22:59PM -0500, Dennis Cook wrote:
> > Using RH Linux kernel 2.4.18, setting "features" bit NETIF_F_IP_CSUM
does
> > not appear
> > to keep a valid IP checksum from being computed in packets presented to
my
> > driver
> > for transmission. So having HW compute outgoing checksum buys nothing.
>
> You are not using sendfile(2), which is required to activate h/w csum.
>
> Jeff
>
>
>
next prev parent reply other threads:[~2003-04-02 20:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-01 12:12 Deactivating TCP checksumming shesha bhushan
2003-04-01 12:28 ` Matti Aarnio
2003-04-02 19:22 ` Dennis Cook
2003-04-02 20:36 ` Jeff Garzik
2003-04-02 20:47 ` Dennis Cook [this message]
2003-04-02 20:58 ` Jeff Garzik
2003-04-03 20:34 ` Dennis Cook
2003-04-03 20:47 ` Jeff Garzik
2003-04-03 20:57 ` Dennis Cook
2003-04-04 14:20 ` Jeff Garzik
2003-04-04 14:08 ` Abhishek Agrawal
2003-04-04 4:41 ` Ion Badulescu
2003-04-02 21:03 ` Richard B. Johnson
2003-04-02 21:22 ` Dennis Cook
-- strict thread matches above, loose matches on Subject: below --
2003-04-01 9:47 shesha bhushan
2003-04-01 10:58 ` Matti Aarnio
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