What's your authentication setup (no details, just general choices)? It sounds like one possible cause is that the current authentication module is running slower than before, or else the PAM select code has slowed down.
Bill Earl wrote:
> Hello everyone,
>
> We had a strange thing happen this morning, and I'm hoping someone in
> the group can point me toward a likely culprit. Both our database
> machines, which are running SuSE 9.1, began exhibiting a strange
> behavior where it's slow to initially connect to them (about 10
> seconds), but after that initial slowness while connecting, everything
> is as speedy as normal.
>
> For example, if you ssh to them, the login prompt appears quickly, but
> after you enter the user name it may be 10 seconds before the password
> prompt appears. Once you get logged in everything works fine and is
> very speedy using the system, copying files across the network using
> scp, etc. All is normal.
>
> When connecting to mysql from another computer, again, it's about 10-15
> seconds for the initial connection, then the query executes rapidly and
> returns the results as fast as always.
>
> Here are the things that DON'T seem to be the problem:
>
> 1. Top shows no unusual activity. The machine is basically idle all the
> time, as it normally is.
> 2. Memory is not in short supply. The swap partition remains unused.
> 3. It's not network congestion. Connection to other machines on the
> network are speedy as always, and once connected to these two machines
> they also respond fine across the network.
> 4. It's not a mysql query bogging things down. The mysql processlist
> shows nothing going on, except the occasional query coming in. Nothing
> is stuck.
>
> It seems to just be something with that initial connection, whether it's
> through ssh or mysql. Viewing the process list and top while logging in
> from another system doesn't show anything starting up or using a lot of
> cpu time.
>
> Does anyone have any suggestions on what to check? This started
> sometime overnight, and all the normal nighttime processes completed
> okay with no errors. They're on an internal network, not exposed to the
> Internet, so I don't suspect an intrusion.
>
> Thanks in advance!
>
> Bill
>
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