delayed_ack and Nagle's algorithm interaction

[Adrian Chadd]

What's the time interval between transmissions? Is it something dumb
like bad timer behaviour?


-a


On 3 March 2014 07:04, Andriy Gapon <avg at freebsd.org> wrote:
>
> Guys,
>
> my knowledge of TCP and our TCP/IP stack is quite basic.
> It seems that we are running into a problem described here or something with
> very similar symptoms:
> http://www.stuartcheshire.org/papers/NagleDelayedAck/
> At least, if I either disable delayed_ack or use TCP_NODELAY option, then the
> problem goes away.  Otherwise, we see quite significant extra latencies.
> Maybe an important detail: the problem is observed for communication between a
> local host client and a server in a jail.  So, all traffic is local (via
> loopback interface).
>
> I have a pcap file that captures the problem.
> Ideas, suggestion, etc are welcome.
> Thanks!
> --
> Andriy Gapon
>
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