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List:       snap
Subject:    RE: [SNAP] Network features in Rel 1.0.5
From:       "Christian Blixt" <christian.blixt () imsystech ! com>
Date:       2007-04-03 9:01:22
Message-ID: NCBBIMLDODFMMFCFADJBKEMPGIAA.christian.blixt () imsystech ! com
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Hi,

OK, then the high multicast traffic is probably the cause. The symptoms seem
consistent with multicast overload.

We have fixed this in two ways: the efficiency of multicast filtering has
been greatly improved, and multicast reception is now turned off in hardware
when not used. This will all be available in the next firmware release,
which will be released next week if nothing comes up to prevent that. There
is not much you can do at the moment, I think.

You can force the Ethernet PHY to 10 Mb/s. Use the se.imsys.system.MDIO
class to modify the PHY's internal registers. You have SNAP modules of
revision D or earlier, right? Then the attached excerpt from the PHY
datasheet will give you the details of the registers. I think if you clear
bits 8 and 7 of register 4 and then set bit 9 of register 0 the link will go
to 10 Mb/s.

Regards,

Christian Blixt
Tel: +46 (0)8 594 110 82
christian.blixt@imsystech.com

Imsys Technologies AB
Tel: +46 (0)8 594 110 70
Fax: +46 (0)8 594 110 89
www.imsystech.com



-----Original Message-----
From: snap-bounces@listserver.songnetworks.se
[mailto:snap-bounces@listserver.songnetworks.se]On Behalf Of Giorgio
Bresciani
Sent: den 3 april 2007 09:08
To: snap@imsystech.com
Subject: Re: [SNAP] Network features in Rel 1.0.5


They told us that on the network multicast traffic is high.
What could I do at the moment? is it possible to filter it by setting
access.ini system file?
Another question: is it possible to set the eth0 rate fixed to 10 Mb/s, and
disable the automatic mode?

Regards.


----- Original Message -----
From: "Christian Blixt" <christian.blixt@imsystech.com>
To: <snap@imsystech.com>
Sent: Monday, April 02, 2007 3:34 PM
Subject: RE: [SNAP] Network features in Rel 1.0.5


> Hi,
>
> Is your network heavily loaded with multicast traffic? I don't know if
that
> could be the cause, but I know we recently (not released yet) improved
> multicast filtering.
>
> Could you try to type "ps -a" at the shell prompt of a system that behaves
> this way?
>
> I'm sorry I can't be of more help, but we haven't experienced this kind of
> behaviour here, even on nets with a high number of nodes.
>
> Regards,
>
> Christian Blixt
> Tel: +46 (0)8 594 110 82
> christian.blixt@imsystech.com
>
> Imsys Technologies AB
> Tel: +46 (0)8 594 110 70
> Fax: +46 (0)8 594 110 89
> www.imsystech.com
>
>
>
> -----Original Message-----
> From: snap-bounces@listserver.songnetworks.se
> [mailto:snap-bounces@listserver.songnetworks.se]On Behalf Of Giorgio
> Bresciani
> Sent: den 14 mars 2007 17:16
> To: snap@imsystech.com
> Subject: [SNAP] Network features in Rel 1.0.5
>
>
> My company recently upgraded ten boards in a plant from Tini to Snap.
> These ten units are connected through Ethernet network to a MSWindows
server
> that acquires data from them towards tcp/ip protocols. The java
application
> makes continuos socket communication on port 502 and occasional
> communication on port 8890, telnet, ftp.
> The units are connected to different subnets, and thanks to their gateways
> they are reachable from any PC in the LAN.
> After replacing Tini with Snap RevC rel1.0.5, we experienced problems on
> snap tcp/ip interface: it gets slower, looses frames, doesn't answer to
ping
> or telnet, tcp/ip data exchanges times out.
> Sometimes, the module hangs up.
> I need to know if Snap has been tested in the same environment (that LAN
is
> made of a large number of nodes hardwares) or anybody experienced a
similar
> problem.
> Regards.
>
>
> _______________________________________________
> Snap mailing list
> snap@imsystech.com
> http://www.imsystech.com/support/maillist.htm
>
>
> _______________________________________________
> Snap mailing list
> snap@imsystech.com
> http://www.imsystech.com/support/maillist.htm
>
>


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