netdev - Re: [RFC PATCH] tcp: limit data skbs in qdisc layer

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Date:	Mon, 09 Jul 2012 10:03:56 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	ycheng@...gle.com, dave.taht@...il.com, netdev@...r.kernel.org,
	codel@...ts.bufferbloat.net, therbert@...gle.com,
	mattmathis@...gle.com, nanditad@...gle.com, ncardwell@...gle.com,
	andrewmcgr@...il.com
Subject: Re: [RFC PATCH] tcp: limit data skbs in qdisc layer

On Mon, 2012-07-09 at 00:08 -0700, David Miller wrote:

> I'm suspicious and anticipate that 10G will need more queueing than
> you are able to get away with tg3 at 1G speeds.  But it is an exciting
> idea nonetheless :-)

I tested the patch on 10G NIC and had no problem on netperf tests.

Only that ixgbe is not yet BQL enabled so I could not add
skb_try_orphan() in its start_xmit() : So if TX completion is a bit
delayed, we can have a throughput slowdown.

I added a /proc/sys/net/ipv4/tcp_limit_output_segs to play with various
limits.



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