netdev - Re: RFC: Nagle latency tuning

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Date:	Tue, 09 Sep 2008 16:36:49 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Snook <csnook@...hat.com>
Cc:	Rick Jones <rick.jones2@...com>, Netdev <netdev@...r.kernel.org>
Subject: Re: RFC: Nagle latency tuning

Chris Snook <csnook@...hat.com> writes:
>
> I'd like to know where the 40 ms magic number comes from. 

>From TCP_ATO_MIN

#define TCP_ATO_MIN     ((unsigned)(HZ/25))

> That's the
> one that really hurts, and if we could lower that without doing
> horrible things elsewhere in the stack, 

You can lower it (with likely some bad side effects), but I don't think it 
would make these apps very happy in the end because they likely want
no delay at all.

-Andi
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