netdev - Re: Minimizing TCP latency

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Message-ID: <7c93bf1e1003282024p75e70011j31577b42f29cc153@mail.gmail.com>
Date:	Mon, 29 Mar 2010 16:24:04 +1300
From:	Ben Hoyt <benhoyt@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Minimizing TCP latency

> I'm happy to receive some pointers via this list [...]

Sorry, I should also have posted more about what I've done in terms of
reducing latency so far:

* We've already got TCP_NODELAY activated.

* We've also turned off interrupt coalescing on the network card (for
example, see http://www.29west.com/docs/THPM/latency-interrupt-coalescing.html).

* We've modified our process's CPU affinity so it runs on a core by
itself, reducing interrupt-handling latency slightly further.

* Our code is written in C, and we've tried to keep it as close to the
kernel's socket calls as possible.

So we're currently looking further into ways to reduce latency, which
currently looks like it'll mean digging deeper into the kernel's
networking options and innards.

FYI, we're using RHE release 4 and kernel version 2.6.9 on x86_64 machines.

-Ben
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