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socket.7: Enhance the description of SO_INCOMING_CPU 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2017-02-19 09:19:57 +01:00
parent b7f97e8ea5
commit a99fa5fb93
1 changed files with 6 additions and 2 deletions
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8
man7/socket.7
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@ -504,8 +504,12 @@ setsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, &cpu, &len);
.fi
.in
The typical use case is one listener per RX queue, as the associated listener
should accept only flows handled in softirq by the same CPU.
Because all of the packets for a single stream
(i.e., all packets for the same 4-tuple)
arrive on the single RX queue that is associated with a particular CPU,
the typical use case is to employ one listening process per RX queue,
with the incoming flow being handled by a listener
on the same CPU that is handling the RX queue.
This provides optimal NUMA behavior and keeps CPU caches hot.
.TP
.B SO_KEEPALIVE