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From: Max Laier <max@love2party.net>
To: freebsd-current@freebsd.org, martin.mato@wanadoo.fr
Date: Fri, 6 Aug 2004 00:35:40 +0200
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Subject: Re: txcsum seems  not working with  my 3com 3c905 TX
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On Friday 06 August 2004 00:24, Martin MATO wrote:
> hayes# ifconfig xl0
> xl0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         options=3D9<RXCSUM,VLAN_MTU>
>         inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
>         inet6 fe80::250:daff:fe42:fc4%xl0 prefixlen 64 scopeid 0x1
>         ether 00:50:da:42:0f:c4
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
>
>
> the tx checksum offloading is not  enabled y default at boot and :
> ifconfig xl0 txcsum
> give me this message:
>
> hayes# ifconfig xl0 txcsum
> ifconfig: txcsum: Invalid argument
>
>
> nota: the rxcsum and -rxcsum  flags are working, and -txcsum  has no
> error messages
>
>
> any ideas?

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/pci/if_xl.c#rev1.168 :
"Disable hardware TX checksumming for 3c905 series chips, as we have
solid reports that it is buggy *and* that it slows down transmit speed."

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