For more information on these elements, see "packet-size". The packet size may be specified in coherence/ cluster-config/ packet-publisher/ packet-size/ maximum-length and preferred-length configuration elements. If your equipment uses a different MTU, then configure Coherence by specifying a packet size which is 32 bytes smaller then the network path's minimal MTU. Having a packet size which does not fill the MTU will result is an under used network. Higher level protocols such as TCP/IP and Coherence TCMP include their own flow-control mechanisms which are not subject to head of line blocking, and also negate the need for the lower level flow-control.īy default Coherence assumes a 1500 byte network MTU, and uses a default packet size of 1468 based on this assumption. Even in this setup head of line blocking can still occur, and thus it is advisable to disable Ethernet flow-control all together. Most switch vendors will recommend that Ethernet flow-control be disabled for inter switch links, and at most be used on ports which are directly connected to machines. This can induce a head of line blocking condition, where one overloaded machine on a switch effectively slows down all other machines.
Note that this pause blocks all traffic from the transmitting side, even traffic destined for machines which are not overloaded. This is implemented by the receiving end sending an Ethernet PAUSE frame to the transmitting end, the transmitting end will then halt transmissions for the interval specified by the PAUSE frame.
Oracle coherence slow initialize full#
Full duplex Ethernet includes a flow-control feature which allows the receiving end of a point to point link to slow down the transmitting end.
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