RE: [PATCH v2 1/2] udp: UDP socket send queue repair

[David Laight]

From: Bui Quang Minh
> Sent: 13 August 2021 12:08
...
> The reason we want to dump the packet in send queue is to make to state of the
> application consistent. The scenario is that when an application sends UDP
> packets via UDP_CORK socket or with MSG_MORE, CRIU comes and checkpoints the
> application. If we drop the data in send queue, when application restores, it
> sends some more data then turns off the cork and actually sends a packet. The
> receiving side may get that packet but it's unusual that the first part of that
> packet is missing because we drop it. So we try to solve this problem with some
> help from the Linux kernel.

Patient: It hurts if I do xxx.
Doctor: Don't do xxx then.

It has to be more efficient to buffer partial UDP packets
in userspace and only send when all the packet is available.

	David

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