netdev - Re: Minimizing TCP latency

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Message-ID: <1269919203.8653.435.camel@localhost>
Date:	Tue, 30 Mar 2010 04:20:03 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Ben Hoyt <benhoyt@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Minimizing TCP latency

On Tue, 2010-03-30 at 15:36 +1300, Ben Hoyt wrote:
> > Choose low-latency NICs.  Read the tuning guide, but run your own
> > benchmarks.
> 
> Is this the tuning guide you're referring to?
> http://fasterdata.es.net/TCP-tuning/linux.html

No, and that doesn't say anything about latency.

There are quite a few generic tuning knobs (buffer and ring sizes,
interrupt moderation and affinity).  However, many vendors of
high-performance NICs, including Solarflare, provide a performance
tuning guide as part of their documentation, which can include
hardware-specific advice.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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