[Samba] Multichannel and RSS Not Detected

[L. van Belle]

At first, multi-channel ist only available if two hosts (e.g. server and client) are 
Interconnected with more then one NIC and all interfaces provides the same network speed. 
For example, to can use a server with 4x 1Gbps NICs and a client with 2x 1Gbps 
NICs connected to a switch (only two NICs will be used for multi-channel), 
but you can’t use a 100Mbps NIC + 1Gbps NIC for the client. 
Windows only uses NICs with the same speed for multi-channel!


Check if you get kernel 5.16+  
https://wiki.samba.org/index.php/LinuxCIFSKernel 

multiple improvements on multichannel code. 

And try adding VFS_object aio_pthread

Try with and without the bind interfaces lines. 

only things I can think of now. 

hope this helps, 

Greetz, 

Louis


> -----Oorspronkelijk bericht-----
> Van: samba <samba-bounces at lists.samba.org> Namens Chris Dos via samba
> Verzonden: maandag 20 juni 2022 00:40
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] Multichannel and RSS Not Detected
> 
> Ten months later and it is time to work on this again.  We used local storage
> to do the job we had to get done last year.  We have other projects coming
> up it will be nice to get this working.
> 
> I am at the point again where googling is not providing any answers.
> Essentially I have a server that RSS Multichannel does not seem to work on,
> but another one with the same NIC and a bit older hardware that works fine.
> I'm probably going to have to take a packet capture to provide help
> debugging this problem so what would the ports need to be or should I just
> dump everything on the interface?  Is there any debug logging that can be
> enabled for Multichannel?
> 
> We are running version 4.15.7 using apt.van-belle.nl Debian packages even
> though we are running Devuan (Debian Bullseye minus SystemD)
> 
> Here is part of my smb.conf file:
> [global]
>     netbios name = SB1
>     interfaces = "172.28.202.10;capability=RSS,speed=1000000000"
> "172.28.90.10;capability=RSS,speed=10000000000"
> "172.28.133.10;capability=RSS,speed=100000000000"
>     server multi channel support = yes
>     workgroup = GIANT
>     wins server = 172.28.202.5
>     os level = 20
>     log level = 3
>     client min protocol = SMB3
>     os level = 8
>     local master = No
>     domain master = No
>     ntlm auth = yes
>     log file = /var/log/samba/log.%m
>     max log size = 1000
>     server role = standalone server
>     obey pam restrictions = No
>     unix password sync = no
>     passwd program = /usr/bin/passwd %u
>     passwd chat = *Enter\snew\s*\spassword:* %n\n
> *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully*
>     invalid users = root
>     usershare path =
>     usershare allow guests = yes
>     guest account = nas
>     aio read size = 1
>     aio write size = 1
>     vfs objects = catia
>     mangled names = no
>     catia:mappings =
> 0x22:0xa8,0x2a:0xa4,0x2f:0xf8,0x3a:0xf7,0x3c:0xab,0x3e:0xbb,0x3f:0xbf,0x5c
> :0xff,0x7c:0xa6
>     posix locking = no
>     security = user
>     map to guest = bad user
>     store dos attributes = yes
>     dos filetimes = yes
> 
> [production]
>     path = /netshares/production
>     force user = nas
>     force group = nas
>     create mask = 770
>     force create mode = 770
>     directory mask = 2770
>     force directory mode = 2770
>     guest ok = yes
>     read only = no
>     hosts allow = 172.28.133. 172.28.90. 172.28.202.5
> 
> Any help would be appreciated.  I reached out to SerNet to see if Stefan
> Metzmacher (who was the main author of the Multichannel code) was
> available and received a support quote for them to help, but out
> management did not want to spend the money at the time.  So I'm back to
> using the mailing list.
> 
> I have found others that have not gotten Multichannel working for some
> reason or another and they just gave up.  I do have Multichannel working on
> three other servers running Devuan with a bit different hardware.  So why it
> is not working on the main server I need it working on I have no idea.
> 
>     Chris
> 
> On 8/21/21 15:45, Chris Dos via samba wrote:
> > Does Samba do any kind of logging for multichannel?  I have logging
> > turned up to 10 and all I see is is the option " oing parameter server
> > multi channel support = yes" and nothing else.  How does one debug why
> > Samba is not using multichannel when it's enabled?
> >
> > I'm actually having to work on my vacation right now to try and solve
> > this as we need it working this Tuesday for our project.  I'm
> > frustrated right now as I cannot see why this is not working.
> >
> > BTW, even though I'm frustrated, I very much appreciate the help being
> provided.
> >
> >     Chris
> >
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