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
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