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Subject: Re: A problem on TCP in High RTT Environment.
From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de>
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Date: Mon, 11 Aug 2014 13:50:24 +0200
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To: Niu Zhixiong <kaiaixi@gmail.com>
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Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>,
 John-Mark Gurney <jmg@funkthat.com>, "Eggert, Lars" <lars@netapp.com>,
 Bill Yuan <bycn82@gmail.com>
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On 11 Aug 2014, at 09:32, Niu Zhixiong <kaiaixi@gmail.com> wrote:

> Thanks for your reminding. I tried hw.igb.num_queues=3D2 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).
So is the curve still the same or is it now constantly half of the SCTP =
throughput which
was almost constant for different RTTs...

Best regards
Michael
>=20
> Regards,
> Niu Zhixiong
> =EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=
=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D=EF=BC=8D
>  kaiaixi@gmail.com
>=20
>=20
> On Mon, Aug 11, 2014 at 3:08 PM, Eggert, Lars <lars@netapp.com> wrote:
> Hi,
>=20
> On 2014-8-10, at 5:48, Niu Zhixiong <kaiaixi@gmail.com> wrote:
> > I am using Intel I350-T4 NIC.
>=20
> igb driver?
>=20
> I've been having weird issues with this driver under 10-RELEASE, too. =
On one machine, I had to limit hw.igb.num_queues=3D2 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.
>=20
> Lars
>=20