Short sends returned in IORING

[Constantine Gavrilov <constantine.gavrilov@gmail.com>]

Jens:

This is related to the previous thread "Fix MSG_WAITALL for
IORING_OP_RECV/RECVMSG".

We have a similar issue with TCP socket sends. I see short sends
regarding of the method (I tried write, writev, send, and sendmsg
opcodes, while using MSG_WAITALL for send and sendmsg). It does not
make a difference.

Most of the time, sends are not short, and I never saw short sends
with loopback and my app. But on real network media, I see short
sends.

This is a real problem, since because of this it is not possible to
implement queue size of > 1 on a TCP socket, which limits the benefit
of IORING. When we have a short send, the next send in queue will
"corrupt" the stream.

Can we have complete send before it completes, unless the socket is
disconnected?


-- 
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Constantine Gavrilov
Storage Architect
Master Inventor
Tel-Aviv IBM Storage Lab
1 Azrieli Center, Tel-Aviv
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