[Codel] [RFC PATCH] tcp: limit data skbs in qdisc layer

[Eric Dumazet]

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.