This is a possibility, there are a decent number of hardware supported offload engines built into ethernet cards nowadays....though I don't know how many support UDP...but if yours does then you could end up without UDP checksums until it actually goes out on the wire.
Very true... nearly every decent Ethernet card nowadays does IP checksums on its own, many of them probably do UDP checksums as well.
In linux, the only way to have the kernel offload IP/TCP checksumming to the NIC is to use the sendfile() call. AFAIK there's no possibility to have the kernel offload any UDP checksumming to the NIC
roy
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