Re: Deactivating TCP checksumming

Jeff Garzik (jgarzik@pobox.com)
Wed, 2 Apr 2003 15:36:53 -0500

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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

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