[lwip-devel] [patch #7060] Patch to optionally inline ip checksum

[Bill Auerbach]

Follow-up Comment #5, patch #7060 (project lwip):

I agree, but I saw it use only one register - for the accumulating checksum. 
If there is no register for this, then yes, this patch has a penalty in one
extra write per item.  The extra read cancels the read that would have
resulted in the call to inet_chksum.

You could also extrapolate that if the processor can't store this checksum in
a register, it can't store the loop count in inet_chksum either and so that
routine is going to be very slow as well.

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