netdev - Re: [PATCH] net_sched: sfq: add optional RED on top of SFQ

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Date:	Fri, 06 Jan 2012 11:43:38 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Dave Taht <dave.taht@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Kathleen Nichols <nichols@...lere.com>,
	Jim Gettys <jg@...edesktop.org>
Subject: Re: [PATCH] net_sched: sfq: add optional RED on top of SFQ

On 01/06/2012 11:33 AM, Eric Dumazet wrote:
> Le vendredi 06 janvier 2012 à 10:30 -0800, Rick Jones a écrit :
>
>> netperf nitpick :)  While I doubt that Dave Taht is running it that way,
>> one can have multiple requests in flight on a single _RR test via the
>> test-specific -b<additionaltrans>  option.  That option is enabled by
>> default (--enable-burst on the configure) in 2.5.0 and later.
>
> Ah Rick, I dont think we can tune IP_TOS with netperf -t UDP_{STREAM|
> RR} ?
>
> I ask because it could be a good thing to set ECT(0) on datagrams to
> check our ECN capabilities and get in the final report from receiver a
> count/percentage of CE frames.

Funny you should mention that :)  In the top-of-trunk (perhaps it is in 
2.5.0 too, I do not recall) there is the global -Y option:

$ src/netperf -Y
src/netperf: option requires an argument -- 'Y'

Usage: netperf [global options] -- [test options]

Global options:
...
     -y local,remote   Set the socket priority
     -Y local,remote   Set the IP_TOS. Use hexadecimal.

So long as you either use the omni code directly, or indirectly by not 
undoing WANT_MIGRATION those should work - for some definition of work 
anyway...I would not be surprised to learn there are bugs in the support.

However, there is nothing presently in the netperf code to cause any 
*individual* send to be so marked independently of the others.

happy benchmarking,

rick jones
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