Donagh McCabe b434be452e Use TCP_NODELAY on outgoing connections ...

On a loopback device (e.g., when proxy-server and object-server are on
same node), PUTs in the range 64-200K may experience a delay due to the
effect of Nagel interacting with the loopback MTU of 64K.

This effect has been directly seen by Mark Seger and Rick Jones on a
proxy-server to object-server PUT. However, you could expect to see a
similar effect on replication via ssync if the object being replicated
is on a different drive on the same node.

A prior change [1] related to Nagel set TCP_NODELAY on responses. This change
sets it on all outgoing connections.

[1] I11f86df1f56fba1c6ab6084dc1f580c395f072dc

Change-Id: Ife8885a42b289a5eb4ac7e4698f8889858bc8b7e
Closes-bug: 1408622

2015-01-15 10:43:42 +00:00

7.1 KiB

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