netdev - Re: [BUG] Thunderbolt network package forward speed problem.

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Message-ID: <20210308062136.GB2542@lahna.fi.intel.com>
Date:   Mon, 8 Mar 2021 08:21:36 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Jax Jiang <jax.jiang.007@...il.com>
Cc:     michael.jamet@...el.com, YehezkelShB@...il.com,
        netdev@...r.kernel.org
Subject: Re: [BUG] Thunderbolt network package forward speed problem.

Hi,

On Sat, Mar 06, 2021 at 11:33:57PM +0800, Jax Jiang wrote:
> Hi!
> Authors of Linux thunderbolt-network driver:
> 
> Problem:
> 
> Thunderbolt network <- Software Router(NUC 11) <- 10G NIC   Speed is normal=
>  about 9-10Gbps
> Thunderbolt network -> Software Router(NUC 11) -> 10G NIC   Speed is super =
> slow about 1Mbps-100Kbps

Have you tried without the 10G NIC? I mean what is the speed you
observe on NUC 11 in both directions?

What the other host is that you connect to NUC 11 over Thunderbolt
cable?

> Thunderbolt network <- Software Router(NUC 11) <- 2.5G NIC(I225-V)   Speed =
> is normal about 2.3-2.4Gbps
> Thunderbolt network -> Software Router(NUC 11) -> 10G NIC   Speed is super =
> slow about 1Mbps-100Kbps
> 
> I have already tested:
> MAC<-> Thunderbolt network <-> Software Router(NUC11)     17Gpbs on both tw=
> o direction.
> 
> Hardware: Intel NUC11 I5
> CPU: Intel TigerLake 1135G7 4Core 8Thread
> OS:  OpenWRT 19.07
> Linux Kernel Version: 5.10.20
> Already Tested Software that have problem: iperf3 smb
> Network Layout:
> 
>  PC(With 2.5G NIC)
> 
>            ^
> 
>            |
> 
>            v
> [macbook pro] <-----thunderbolt 3------------> Software
> Router<---------------> NAS(With 10G NIC)
>                            thunderbolt network         (NUC11 With 10G NIC)
> 
> I met problem like this in some network switch which does not support flow =
> control.
> So I guess maybe thunderbolt-network driver miss flow control support.
> 
> I am try to build a software router with using latest NUC hardware. Use thu=
> nderbolt network to trans 10G NIC card or 2.5G NIC to latest having thunder=
> bolt port laptop or devices. Latest intel mobile chip had internal thunderb=
> olt controller, which is cheaper than previous devices. I think it=1B$B!G=
> =1B(Bs a chance to bring high speed network to general consumer.
> I am a coder but not familiar with Linux kernel source code.
> At same time I am a want to build a cool product geek.
> Any help would be great  ;-)
> 
> Thanks
> 
> A want to build a geek products geek.
> Jax