Can someone confirm? tg3 MTU issues.

 have tried everything possible short of testing a different
network card
 because I do not have one. I have delt with IMB support but
since I run
 gentoo they are not much if any help at all. I compiled the
drivers they
 provide with the same results. I tried booting from gentoo
live disk.. I am
 running out of ideas. I have tried doing this on different
network switches
 differnt cables... and still nothing.

 I can not lower the mtu on *any* on my Broadcom Corporation
NetXtreme nics.
 I
 have 5 of these boxes! Same results on all.

 my test is this:
 
 ping -s 5000 somehost.inmy.lan

 works as expected.

 ifconfig eth0 mtu 1492
 ping -s 5000 somehost.inmy.lan

 nothing.. and of course I set my mtu back to 1500
everything works fine.

 I have done this same test with machines with different
nics and everything
 works.

 I am building 2.6.20 now in hopes it may fix something.

 Any ideas?

 Thanks

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Hi there,
>  ifconfig eth0 mtu 1492
>  ping -s 5000 somehost.inmy.lan
>
>  nothing.. and of course I set my mtu back to 1500
everything works fine.
>
>  I have done this same test with machines with
different nics and everything
>  works.
>   
I'm running about 15 servers on tg3 drivers with kernels
ranging from
2.6.17 to 2.6.19. I just tested it on one machine with
2.6.19 and it
works as expected.

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Ok, this is great. In saying that do you have any idea what
I should look at?

Again same tests on any of my servers running different nics
work fine
connected to the same switch. I have the latest nic firmware
from ibm... I
guess it could be something else ibm specific?

These are the two cards I am having issues with.

Broadcom Corporation NetXtreme BCM5721
Broadcom Corporation NetXtreme BCM5703X

I probably should have noted that seeing the tg3 supports a
wide range of
nics ..
Could you test on a machine using one of these cards or did
you already?

thanks for the response.

On 07:12 Wed 07 Feb     , frilled wrote:
> Hi there,
> >  ifconfig eth0 mtu 1492
> >  ping -s 5000 somehost.inmy.lan
> >
> >  nothing.. and of course I set my mtu back to 1500
everything works fine.
> >
> >  I have done this same test with machines with
different nics and everything
> >  works.
> >   
> I'm running about 15 servers on tg3 drivers with
kernels ranging from
> 2.6.17 to 2.6.19. I just tested it on one machine with
2.6.19 and it
> works as expected.
> 
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Hi there,

> Ok, this is great. In saying that do you have any idea
what I should look at?
>   
Sorry - if I had I'd have said it. Possibly really specific
to some
hardware? It worked on BCM5751 and BCM5703X here. I could
test a BCM5701
(that would be glass, I think), but that'd need some  time,
since wiring
glass isn't really an easy thing to do here right now.

But the BCM5703X is the one giving you problems, and it
works for me.
Those are actually the copper gbit cards in all our HP
ProLiants.
Hmm. Very strange indeed. Your best guess might be a network
tester
(like Fluke), I think. Does the switch log anything
interesting to syslog?

Regards,

frilled

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Well thanks for testing this out for me. I appreciate it.

Also I changed the title in hopes to grab someone with an
IBM xseries who
could test..

Also does anyone recommend another list I could post to in
hopes of figuring
this out?

comments in line:

> On 14:36 Wed 07 Feb     , frilled wrote:
> Hi there,
> 
> > Ok, this is great. In saying that do you have any
idea what I should look at?
> >   
> Sorry - if I had I'd have said it. Possibly really
specific to some
> hardware? 

Yea I am truly at a lose right now and have no idea what it
could be.

> It worked on BCM5751 and BCM5703X here. I could test a
BCM5701
> (that would be glass, I think), but that'd need some 
time, since wiring
> glass isn't really an easy thing to do here right now.
> 
> But the BCM5703X is the one giving you problems, and it
works for me.
> Those are actually the copper gbit cards in all our HP
ProLiants.
> Hmm. Very strange indeed. Your best guess might be a
network tester
> (like Fluke), I think.

I will be looking into this.

> Does the switch log anything interesting to syslog?

This particular switch is a un-managed netgear Gigabit
switch.. It does not
log to anything I have set up... But again other machines
connect to this
switch work as expected.

> 
> Regards,
> 
> frilled

Thanks Again,
Brett

> 
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Brett Curtis wrote:
> Ok, this is great. In saying that do you have any idea
what I should look at?
> 
> Again same tests on any of my servers running different
nics work fine
> connected to the same switch. I have the latest nic
firmware from ibm... I
> guess it could be something else ibm specific?
> 
> These are the two cards I am having issues with.
> 
> Broadcom Corporation NetXtreme BCM5721
> Broadcom Corporation NetXtreme BCM5703X
> 
> I probably should have noted that seeing the tg3
supports a wide range of
> nics ..
> Could you test on a machine using one of these cards or
did you already?
> 
> thanks for the response.

I'm seeing the same behavior on my Dell SC servers BCM5751
and BCM5721. 
2.6.17-gentoo-r4 in both cases. I might have a newer kernel
I can try 
later. One thing to note is that both of these are PCI
Express.

Oddly changing to MTU 1492 on the e1000 chips (82541GI)
locks the 
interface for about 20-30 seconds before it responds again
after which 
the ping -s 5000 does work. 2.6.19-gentoo-r5 on those
servers and the 
Intel is PCI Express as well.

kashani

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Hello
On 11:25 Wed 07 Feb     , kashani wrote:
> Brett Curtis wrote:
> >Ok, this is great. In saying that do you have any
idea what I should look 
> >at?
> >
> >Again same tests on any of my servers running
different nics work fine
> >connected to the same switch. I have the latest nic
firmware from ibm... I
> >guess it could be something else ibm specific?
> >
> >These are the two cards I am having issues with.
> >
> >Broadcom Corporation NetXtreme BCM5721
> >Broadcom Corporation NetXtreme BCM5703X
> >
> >I probably should have noted that seeing the tg3
supports a wide range of
> >nics ..
> >Could you test on a machine using one of these
cards or did you already?
> >
> >thanks for the response.
> 
> I'm seeing the same behavior on my Dell SC servers
BCM5751 and BCM5721. 
> 2.6.17-gentoo-r4 in both cases.
> I might have a newer kernel I can try 
> later. One thing to note is that both of these are PCI
Express.
> 

I have tried almost every kernel from 2.6.12 up to 20 still
with no luck. All
of my nics that are failing when lowering the mtu are also
on PCI Express.

> Oddly changing to MTU 1492 on the e1000 chips (82541GI)
locks the 
> interface for about 20-30 seconds before it responds
again after which 
> the ping -s 5000 does work. 2.6.19-gentoo-r5 on those
servers and the 
> Intel is PCI Express as well.

Works fine with my intel nic. (82546EB) again also on PCI
Express.


> 
> kashani

Thanks, I wonder where I should go now.. Wonder if its a tg3
kernel bug.
> 
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Hi Brett,
on Wednesday, 2007-02-07 at 08:11:19, you wrote:
> These are the two cards I am having issues with.
> 
> Broadcom Corporation NetXtreme BCM5721
> Broadcom Corporation NetXtreme BCM5703X

Seems I'm having the same problems with the latter chip.
Early last year
I tried to enable jumbo frames on our ProLiant ML370 and
some
workstations and didn't succeed. As it was just a
nice-to-have I didn't
investigate any further and just switched back to MTU 1500,
but now this
sounds very familiar. It was kernel 2.6.12-hardened or
something back
then, I'll check again one of these days.

cheers!
	Matthias
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Hi!

>> These are the two cards I am having issues with.
>>
>> Broadcom Corporation NetXtreme BCM5721
>> Broadcom Corporation NetXtreme BCM5703X
> 
> Seems I'm having the same problems with the latter
chip. Early last year
> I tried to enable jumbo frames on our ProLiant ML370
and some
> workstations and didn't succeed. As it was just a
nice-to-have I didn't
> investigate any further and just switched back to MTU
1500, but now this
> sounds very familiar. It was kernel 2.6.12-hardened or
something back
> then, I'll check again one of these days.
I've expected the same issue with the former NIC (NetXtreme
BCM5721) 
while trying to increase the MTU value higher than 1500.
The Broadcom support confirmed that this NIC doesn't support
jumbo frames :(

regards	
Chris
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