Okay so "man cmsg"
I've seen cards (ethtool) that support several time options - what are
they and how do I use them?
Also cmsg doesn't make it clear what these auxiliary headers might
actually be, so that doesn't really leave me able to use this?
Is it ALWAYS there? What about receive offload?
Alec
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On 2021-12-14 20:57, Hal Murray wrote:
[email protected] said:
I've seen SO_TIMESTAMP and friends in ethtool but I have no idea what
it is
or how it works, can you point me in the right direction please?
man 7 socket on a Linux box. Then man recvmsg and man cmsg
There are several variations on various OSes.
The basic idea is that the OS input processing grabs a time stamp when
the
packet arrives. On Linux, that's done by the kernel thread that looks
in the
packet headers to figure out which input queue the packet goes on.
The basic idea is that you get a time stamp when the packet arrives
rather
than when the user program gets around to read/recv-ing it.
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