Peter Lieven e058e825bf socket: break receive loop if there are no more outstanding PDUs ...

If the length of iscsi->waitpdu and iscsi->inqueue are the same
then except for any target initiated NOPs or async messages
we should have received any and all possible pdus from this
socket and can abort early.

This avoids running the loop one more time just to fail with EAGAIN
at the recs/readv. Just avoiding that recv/readv syscall will shave
at least 10us off this function and thus the latency.

Suggested-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Peter Lieven <pl@kamp.de>

2017-01-03 11:13:06 +01:00

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