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Due to Nagle, an OF message that an application sends might be not delivered to a switch immediately. This patch disables Nagle. This has bad effect on throughput. I think that the latency matters for any management channel. To avoid throughput drop, we could use TCP_CORK on Linux but it's linux specific. Reviewed-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>