I have experienced the same
thing (only using mostly SSH) on the TS-7553.
The commands are being processed as you say,
it is merely the output being echoed back. I
have never seen such a thing before this
either, and had reported it to technologic. I
have also noticed that it's not just after a
period of time, it is dependent on how many
chars are waiting as well. Too many, and you
get a connection reset by peer, not enough and
it hangs up on the other side and when you
type something you get a write failed: broken
pipe instead. It appears TCP is fighting very
hard to keep it going but there is errors,
yet, if you look at the interface statistics
it says no such thing. So It appears to be an
issue at the kernel level (or perhaps also
hardware error that is just not being detected
by the kernel driver)...
I have also noticed, interestingly, the
problem happens much less often, but still
happens, when I boot from an SD card using the
Jun082011 image. I have not tried the sep06
image yet (and would be difficult to do so
since I've installed many custom packages).
Another observation I've made, which makes it
even more confusing, is that if I have
multiple SSH sessions open, it is only ONE of
them that is affected this way, I can still
access the other sessions normally. It's AS IF
scroll-lock was in effect on that one
terminal, even though it's not, and randomly
restarts with no intervention.
Have you tried the latest image?
On 09/28/11 06:16, naturalwatt wrote:
Hi.
Has anyone else experienced what
feels like lockups when connecting
to the TS7500/TS7550 boards using
telnet?
This is running Debian on the boards
and does not affect TS7250.
While typing away, every few minutes
(but not predictably or
consistently) it suddenly seems to
go dead, only to carry on where you
left off after around 30 seconds or
so. It is not related to filesystem
access as far as I can tell. I wrote
a program to usleep and produce a
histogram of delays, and this shows
it is not a system wide lockup - in
addition the watchdog does not go
off.
If you have another telnet session
to the same board, that will
experience lockups at different
times to the first one.
All the systems (TS7250 and TS7550)
are on the local subnet.
It feels like a network problem, and
I have some evidence that characters
I type are being received but not
echoed. If I type a command that has
an effect on the LEDs, that is
actioned even though I cannot see
the keystrokes I enter.
I've never seen a problem exactly
like this and would welcome any
suggestions for solution or
investigation.
Martin
--
Ryan