Hi Jason,
thank you for your reply. The SUN link was very descriptive.
Firstly, it appears the problem is still there with the kernel build you
suggested/ After a few megabytes, the connection closes telling me;
"Corrupted MAC on input".
But interestingly it seems to have solved another problem that I was
having with one of our ROACH boards. It would be great if you could send
me the .config file for that build so I can compare it with mine. I have
a custom kernel as I like ext3 support and a few other bits and pieces,
but have been having some issues getting the network to establish a
stable link.
Now, back to the problem; We have a locally attached harddrive that we
are writing our data to over USB. Occasionally we want to connect and
download these. That's why I am using ssh. I can't really use KATCP for
this, can I?
Thanks again,
Kjetil
Jason Manley wrote:
Um, no, this is probably a different problem. You are getting these
errors while using SSH/SCP, right? The hardware problem with faulty
PHY manifests as one or more of the PHY LEDs flashing on/off (there
are three red ones next to the PHY chip). If your link is stable, then
I believe the hardware is fine.
The "MAC" problem appears to be software related, and comes and goes
depending on the kernel build. It does not refer to the MAC address,
but rather ssh's Machine Authentication Code. Check out http://blogs.sun.com/janp/entry/ssh_messages_code_bad_packet
for some info.
Dave's made various changes to try'n fix it, and increasing some
software buffer has solved it for me. I no longer see this problem,
but it's probably been masked rather than solved. Also, you never see
it using KATCP, which is one more reason to use that method for larger
transfers.
WRT large (>1GB) transfers, remember that it will take a long time to
pull that much data off the FPGA. It does so in pages of ~4000Bytes at
a time. Also make sure you're using the latest kernel. We discovered a
bug in this paging system during the workshop. http://casper.berkeley.edu/svn/trunk/roach/sw/binaries/linux/uImage-20091006-mmcfix
should be good. I have never tried pulling such volumes over the SSH
shell, but it works fine with KATCP.
I will ask him to comment further.
Jason
On 30 Oct 2009, at 01:25, John Ford wrote:
casper collaborators,
appended below is further info on roach ethernet problems seen at
CSIRO:
any ideas?
If I recall correctly, Alan mentioned this problem at the workshop,
and
the problem was that some of the PHY chips were faulty at one
point. This
may be what's going on. Hopefully someone knows for sure!
John
thanks,
dan
-------- Original Message --------
Subject: Re: SPDO ROACH spectrometer
Date: Fri, 30 Oct 2009 09:19:01 +1100
From: Kjetil Wormnes <kjetil.worm...@csiro.au>
To: Dan Werthimer <d...@ssl.berkeley.edu>
Hi Dan and Wan
I can confirm that we are seeing at least some of the problems with
another ROACH board as well. This time it is connected directly to a
computer with a short CATY5 cable.
So maybe this indicates that it is less likely to be a hardware
problem?
Incidentally, the error message that happens when attempting to
download
a large file over sftp is "Corrupted MAC on input".
cheers
Kjetil
Dan Werthimer wrote:
hi wan,
i don't know of anyone who has roach ethernet
problems at 100 Mbit/sec.
i'm cc'ing casper community to see if anyone has any ideas.
in general, it's good to post questions to cas...@lists,
so that everyone can help answer, and everyone can see the answers,
and the info will be captured in the wiki/email archive.
if you want you can buy or ask digicom if they can send you
another national PHY chip and see if this helps.
also you might want to try using short cable, and/or a cat6 cable.
is your roach connected directly to a computer, or going
through a switch? might be interesting to try a different NIC
or different switch or different computer.
best,
dan
On 10/29/2009 02:47 PM, wan.ch...@csiro.au wrote:
Hi Dan:
I believe you have done a very nice job.
My problem is Ethernet port is not very reliable. Even running at
100MHz, the Ethernet port will be disconnected at some times.
Normally,
it can resume after reboot whole system.
And I could not transfer big file through ethernet. Small files
like a
few MB are all right. But I could not download 1GB file from
Roach at
all.
So Dan, could this problem be solved by replacing the on board PHY?
Thanks
Wan
