A problem on TCP in High RTT Environment.

[Niu Zhixiong]

Thanks for your reminding. I tried hw.igb.num_queues=2 just now. But, the
throughput is still slow. And When I tested same things in my Virtual
machine-based environment(use Virtio), the throughput is similar(SCTP is 2x
than TCP).

Regards,
Niu Zhixiong
－－－－－－－－－－－－－－－
 kaiaixi at gmail.com


On Mon, Aug 11, 2014 at 3:08 PM, Eggert, Lars <lars at netapp.com> wrote:

> Hi,
>
> On 2014-8-10, at 5:48, Niu Zhixiong <kaiaixi at gmail.com> wrote:
> > I am using Intel I350-T4 NIC.
>
> igb driver?
>
> I've been having weird issues with this driver under 10-RELEASE, too. On
> one machine, I had to limit hw.igb.num_queues=2 in order to get any sort of
> useful connectivity. On another machine, I had to severely bump
> kern.ipc.nmbclusters & friends. I'm not sure this is the issue here, since
> SCTP seems to be working OK, but I'm not trusting igb NICs at the moment.
>
> Lars
>