Re: RFC: Nagle latency tuning

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To: Andi Kleen <andi@...>
Cc: Netdev <netdev@...>
Date: Tuesday, September 9, 2008 - 1:22 am

Andi Kleen wrote:

How variable is it?  I've never seen any value other than 40 ms, from 
2.4.21 to the latest rt kernel.  I've tweaked every TCP tunable in 
/proc/sys/net/ipv4, to no effect.

The people who would care enough to tweak this would be more than happy 
to accept an increase in the number of packets.  They're usually asking 
us to disable the behavior completely, so if we can let them tune the 
middle-ground, they can test in their environments to decide what values 
their network peers will tolerate.  I have no interest in foisting this 
on the unsuspecting public.


Perhaps a messaging-optimized non-default congestion control algorithm 
would be a suitable way of addressing this?

-- Chris
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Messages in current thread:
RFC: Nagle latency tuning, Christopher Snook, (Mon Sep 8, 5:56 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 8, 6:55 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Tue Sep 9, 1:22 am)
Re: RFC: Nagle latency tuning, Rick Jones, (Mon Sep 8, 6:39 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Tue Sep 9, 1:10 am)
Re: RFC: Nagle latency tuning, Rick Jones, (Tue Sep 9, 12:33 pm)
Re: RFC: Nagle latency tuning, Chuck Lever, (Tue Sep 9, 12:54 pm)
Re: RFC: Nagle latency tuning, Rick Jones, (Tue Sep 9, 1:54 pm)
Re: RFC: Nagle latency tuning, Arnaldo Carvalho de Melo, (Tue Sep 9, 1:21 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Tue Sep 9, 10:36 am)
Re: RFC: Nagle latency tuning, Chris Snook, (Tue Sep 9, 2:40 pm)
Re: RFC: Nagle latency tuning, David Miller, (Tue Sep 9, 3:59 pm)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 6:49 am)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 7:09 am)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 22, 4:30 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Mon Sep 22, 6:22 pm)
Re: RFC: Nagle latency tuning, Rick Jones, (Mon Sep 22, 6:47 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Mon Sep 22, 6:57 pm)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 6:26 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Mon Sep 22, 7:00 pm)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 7:13 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 22, 7:24 pm)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 7:21 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 22, 8:14 pm)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 9:40 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 22, 10:23 pm)
Re: RFC: Nagle latency tuning, David Miller, (Mon Sep 22, 10:28 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 22, 10:41 pm)
Re: RFC: Nagle latency tuning, Rick Jones, (Mon Sep 22, 8:33 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Mon Sep 22, 10:12 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Tue Sep 9, 4:25 pm)
Re: RFC: Nagle latency tuning, Andi Kleen, (Tue Sep 9, 3:07 pm)
Re: RFC: Nagle latency tuning, Chris Snook, (Thu Sep 11, 12:08 am)
Re: RFC: Nagle latency tuning, Arnaldo Carvalho de Melo, (Tue Sep 9, 3:21 pm)
Re: RFC: Nagle latency tuning, David Miller, (Tue Sep 9, 1:17 am)
Re: RFC: Nagle latency tuning, Chris Snook, (Tue Sep 9, 1:56 am)
Re: RFC: Nagle latency tuning, Evgeniy Polyakov, (Tue Sep 9, 2:22 am)
Re: RFC: Nagle latency tuning, Arnaldo Carvalho de Melo, (Tue Sep 9, 9:00 am)
Re: RFC: Nagle latency tuning, Chris Snook, (Tue Sep 9, 2:28 am)
Re: RFC: Nagle latency tuning, David Miller, (Tue Sep 9, 2:02 am)
Re: RFC: Nagle latency tuning, Mark Brown, (Tue Sep 9, 6:31 am)
Re: RFC: Nagle latency tuning, David Miller, (Tue Sep 9, 8:05 am)
Re: RFC: Nagle latency tuning, Mark Brown, (Tue Sep 9, 8:09 am)
Re: RFC: Nagle latency tuning, David Miller, (Tue Sep 9, 8:19 am)