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If the configured size is larger than the bandwidth-delay product, your BIG-IP may use more memory per connection than it can use at any given time, reducing the capacity of your system.Ī sending rate that exceeds the uncongested BDP of the path will cause router queues to build up and possibly overflow, resulting in packet losses. There's more on getting the proper RTT below. Therefore, we recommend that your send buffer be set to at least your (maximum achievable sending rate) * RTT, more generally known as the Banwidth-Delay Product (BDP). Regardless of whatever available bandwidth there happens to be, congestion and peer receive windows, and so on. (Sending Rate) = (send-buffer-size) / RTT

Generally, this means your sending rate is firmly limited to

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Then the other 5 will have to wait in the proxy buffer until at least the first 5 are acknowledged, which will take one full Round Trip Time (RTT). Say you have 10 packets to send (allowed by both congestion control and the peer's receive window) but only 5 spaces in the send buffer. The Send Buffer size is a practical limit on how much data can be in flight at once. However, note that you can force the configured send buffer limit to always apply by setting tm.tobuffertuning to 'disabled,' or force it to never apply by enabling tm.tcpprogressive. We fully recognize that this not an intuitive way to operate, and have plans to streamline it soon.

Otherwise, the maximum send buffer size is equal to the system variable tm.tcpprogressive.sndbufmax, which defaults to 16MB.

If the configured send buffer size AND the configured receive buffer size are 64K or less, the maximum send buffer size is 64K.

Given the conditions above, the send buffer maximum is one of two values, instead of the configured one: Note that none of these settings apply to the default TCP profile, so the default profile enforces the send buffer limit.

The system variable tm.tcpprogressive is set to 'enable' or 'mptcp'.

The virtual server executes an iRule with the ' TCP::autowin enable' command.

The Congestion Control algorithm is Vegas, Illinois, Woodside, CHD, CDG, Cubic, or Westwood.

It does not apply when the system variable tm.tobuffertuning is enabled, which is the default, AND at least one of the following attributes is set in the TCP profile: Through TMOS v12.1, there are important cases where the configured send buffer limit is not operative. Cases Where the Configured Send Buffer Limit Doesn't Apply Note that there are two send buffers in most connections, as indicated in the figure above: one for data sent to the client, regulated by the clientside TCP profile and one for data sent to the server, regulated by the serverside TCP profile.

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When an acknowledgment for some data arrives, there will be no retransmission and it can free that data.**Įach TCP connection will only take system memory when it has data to store in the buffer, but the profile sets a limit called send-buffer-size to cap the memory footprint of any one connection.

The send buffer exists because sent data might need to be retransmitted. With a few isolated exceptions*, data not yet sent is not in the buffer and remains in the proxy buffer, which is in the subject of different profile parameters. The TCP send buffer contains all data sent to the remote host but not yet acknowledged by that host. I also want to call your attention to cases where the setting doesn't do what you probably think it does.

Today I'll dive a little deeper into how the send buffer works, and why it's important.

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Earlier this year, my guide to TCP Profile tuning set out some guidelines on how to set send-buffer-size in the TCP profile.