Subject: Re: RFC: Nagle latency tuning

From: Andi Kleen <[email-masked]>
Date: Tue, 09 Sep 2008 16:36:49 +0200

Chris Snook <[email-masked]> 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