Re: turning off tcp checksums.

[Stephen Hemminger <shemminger@xxxxxxxx>]

On Fri, 28 Jan 2005 10:59:31 -0700
sudeep list <sudeep.list@xxxxxxxxx> wrote:

> hello,
> 
> I am trying to conduct some throughput experiments using a modified
> TcP/IP stack. One of the things that I would like to do is to turn off
> the TcP checksum. The idea is that the application computes its own
> checksum, and having tcp duplicate the effort with a weaker checksum
> doesnt make sense. This still leaves the tcp header without any
> checksum, but since this is a lab environment, I hope to get away with
> it for now :-)

Not allowed per RFC's and "forget about it", since the copy path
does checksumming at almost no cost. If you still think it is a
real issue then get a NIC that supports hardware checksumming.

-- 
Stephen Hemminger       <shemminger@xxxxxxxx>