CURRENT branch and older OSes

[Russ Allbery]

Julien ÉLIE <julien at trigofacile.com> writes:

>> Normally, Nagle's algorithm is a performance optimization that we want
>> (think collecting the pieces of an OVER reply into one packet).

> HDR, OVER and XPAT use stdio and such little pieces are sent with
> PushIOb only when they reach the size of BIG_BUFFER, as you once
> mentioned.  So it should not affect these replies.  The only replies it
> will affect are LIST replies (Printf on each line) but I did not notice
> a slow on Debian.  With Wireshark, I saw that there was not a packet for
> each line but that they were sent grouped, as though TCP_NODELAY were
> overriden by another thing elsewhere.

You're right, I'd forgotten that we'd already done that work.  Hm.  Maybe
we should just enable it unconditionally, then, if it still makes a
difference.  I suspect that it may change based on the TCP behavior of the
client, since the interaction with TCP delayed acknowledgements would be
with whether the client is delaying acknowledgements.

-- 
Russ Allbery (rra at stanford.edu)             <http://www.eyrie.org/~eagle/>

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