Re: [PATCH RFC net-next 2/2] tcp: Add Redundant Data Bundling (RDB)

Jonas Markussen
2015-10-27T19:15:42Z

On 26 Oct 2015, at 22:58, Yuchung Cheng <ycheng@google.com> wrote:
> but would RDB be voided if this developer turns on RDB then turns on
> Nagle later?

The short answer is answer is "kind of"

My understanding is that Nagle will delay segments until they're
either MSS-sized or until segments "down the pipe" are acknowledged.

As RDB isn't able to bundle if the payload is more than MSS/2, only
an application that that sends data less frequent than an RTT would
still theoretically benefit from RDB even if Nagle is on.

However, in my opinion this is a scenario where Nagle itself is void:

If you transmit more rarely than the RTT, enabling Nagle makes no
difference.

If you transfer more frequent than the RTT, enabling Nagle makes
RDB void.

-Jonas