Re: A case AGAINST checksum offload

[John Heffner <jheffner@xxxxxxx>]

On Fri, 12 Nov 2004, David S. Miller wrote:

> The data could just as easily be corrupted on the way to the CPU when
> doing a copy+checksum operation.  It's the same problem you say exists
> with your networking card case except the path of the corruption is
> RAM-->CPU instead of RAM-->PCI Controller-->Networking Card
>
> I really don't buy this. :-)

Sure.  But we can get a check on one point of failure nearly free.  I've
measured about a 1% difference in CPU use with checksum on vs. off at 1
gigabit.

Probably not a big deal (yeah, somethings buggy anyway and needs to be
fixed or replaced), but I thought it worth pointing out.

  -John