Hello Mark,<div><br></div><div><br></div><div><br><br><div class="gmail_quote">On Sat, May 25, 2013 at 11:59 AM, Mark Phillips <span dir="ltr"><<a href="mailto:mark@phillipsmarketing.biz" target="_blank">mark@phillipsmarketing.biz</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I have an old headless server running Linux version 2.6.32-5-686 (Debian 2.6.32-48squeeze1) (<a href="mailto:dannf@debian.org" target="_blank">dannf@debian.org</a>) (gcc version 4.3.5 (Debian 4.3.5-4) ). Recently, when I log in using ssh the terminal window freezes for a few seconds, then usually comes back. The command line stops printing the characters I am typing, the cursor stops blinking, and then after a few seconds, it comes back. This happens every few minutes, so it is becoming rather annoying.<br>
</div></div></blockquote><div><br></div><div>Here's the general list (some of which you have done already).</div><div><br></div><div>0 - Make sure that it's not swapping with "free".</div><div>1 - Check that you have no ethernet errors with "ethtool eth0" (or whatever your interfaces are) and look for errors.</div>
<div>1.5 - Check '<span style="background-color:rgb(238,238,238);color:rgb(34,34,34);font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif;font-size:13px;line-height:16px"> netstat -s -p|grep "segments retransmited" ' for packet loss</span></div>
<div>2 - Check "netstat -antp" to see what is listening and/or bogging down.</div><div>3 - Check "lsof" to see what the system is doing.</div><div>4 - Are you accessing SSH via SSH forwarding, a different place/network or VPN? This could be a MTU issue. </div>
<div>5 - Run "nmap $servername" from your system to check what is available and listening.</div><div>6 - Look in your logs for security issues; specifically access attempts to open ports; firewall to only allow source and destination for SSH, DNS or other Mail as appropriate.</div>
<div>7 - Disable your SSH timeout - just to be safe: <a href="http://docs.oseems.com/general/application/ssh/disable-timeout">http://docs.oseems.com/general/application/ssh/disable-timeout</a></div><div>8 - Use a ping from your system to the server to see if you can see latency.</div>
<div>9 - Use a traceroute/tracert to see latency between any hop.</div><div> </div><div><br></div><div>Use the Source my friend! </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div>
<br></div><div>When I check the disks, I get<br># df -h<br>Filesystem Size Used Avail Use% Mounted on<br>/dev/sda1 182G 42G 131G 25% /<br>tmpfs 505M 0 505M 0% /lib/init/rw<br>
udev 500M 140K 500M 1% /dev<br>tmpfs 505M 0 505M 0% /dev/shm<br>/dev/sdb1 230G 146G 72G 67% /mnt/sdb<br><br></div><div>So I am not running out of disk space. <br>
<br></div><div>When I run top, I get this output:<br>Tasks: 90 total, 3 running, 87 sleeping, 0 stopped, 0 zombie<br>Cpu(s): 7.0%us, 3.0%sy, 0.0%ni, 82.7%id, 6.6%wa, 0.3%hi, 0.3%si, 0.0%st<br>Mem: 1032748k total, 1013748k used, 19000k free, 242992k buffers<br>
Swap: 2017272k total, 1040k used, 2016232k free, 473584k cached<br><br></div><div>So I am not running a process that is taking over the CPU.<br><br></div><div>How should I go about diagnosing this problem?<br><br>
</div><div>Thanks!<span class="HOEnZb"><font color="#888888"><br><br></font></span></div><span class="HOEnZb"><font color="#888888"><div>Mark <br></div></font></span></div>
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