tcp_output starving -- is due to mbuf get delay?

[Terry Lambert]

Mattias Pantzare wrote:
> > The products that Jeffrey Hsu and I and Alfred and Jon Mini
> > worked on at a previous company had no problems at all on a
> > 1Gbit/S saturating the link, even through a VLAN trunk through
> > Cisco and one other less intelligent switch (i.e. two switches
> > and a VLAN trunk).
> 
> A key factor here is that the testst where on a link with a 20ms
> round-tip time, and using a singel TCP connection. So the switches
> where in addition to a few routers on a 10Gbit/s network.

Sorry, but tis is not a factor.  If you think it is, then you
are running with badly tuned send and receive maximum window
sizes.

Latency = pool retention time = queue size

-- Terry