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

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Date:	Fri, 6 Jan 2012 18:36:07 +0100
From:	Dave Taht <dave.taht@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	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 Fri, Jan 6, 2012 at 6:07 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le vendredi 06 janvier 2012 à 17:56 +0100, Dave Taht a écrit :
>> On Fri, Jan 6, 2012 at 5:31 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> > Adds an optional Random Early Detection on each SFQ flow queue.
>>
>> netperf -t TCP_RR is useful
>> -t TCP_MAERTS will be interesting.
>> simultaneous ping?
>>
>
> I dont know what you expect from pings, since they are already coming in
> new flows (unless a ping flood is in effect), so RED doesnt fire for
> these packets.
>
> Same for TCP_RR : Since at most one packet is in flight per flow, RED
> cannot fire.
>
> So there is no differences for them.

Your environment is rather different than mine, and I like having
baseline numbers around... but I can live without as I was hovering
over the build button in my bql tree, and I'm building now.

Up until the world changed, a few days ago, those two did matter when
comparing results against QFQ and
various combinations of it's sub-qdiscs. I'm at the point now where I
have to do cdf plots against large data sets in order to see
*anything*, and I'm looking forward to seeing how well this does
against wireless, which is really noisy...

TCP_MAERTS tests activity in the other direction and (again, your
environment is different) does interesting things against byte
oriented red, or rather, 'did' when last I checked several eons
(months) ago, which was prior to the avqueue fixes.

Another excellent test is the 'apache benchmark', ab, while under a
saturating load from something else.

At some point I'd like to try iobench against nfs and samba, even
iscsi against multiple initiators...

-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
FR Tel: 0638645374
http://www.bufferbloat.net
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