[Cialug] Troubleshooting high latency/low speed
Nathan C. Smith
nathan.smith at ipmvs.com
Mon Jul 26 16:59:57 CDT 2010
not sure what you actually have access to, but duplex mismatches and strange routing come to mind. Does the route always come back the same? an MTU mismatch might also cause latency in some things but not in others. you could try pinging with successively smaller packet sizes to see which ones go through best. Not an expert with this but one of them will chime in soon I'm sure.
-Nate
________________________________
From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On Behalf Of Matthew Nuzum
Sent: Monday, July 26, 2010 4:46 PM
To: Central Iowa Linux Users Group
Subject: [Cialug] Troubleshooting high latency/low speed
Hello, I've got a server and accessing it is slow lately (about a week now). Sometimes just slow, other times intolerably slow.
Ping does not indicate too much prob. Latency is about 70-80ms which is fine. However SSH, HTTP and even HTTPS over a non-standard port all make it clear there is a problem. Can you suggest how to troubleshoot this?
wget http://www.bearfruit.org/wp-includes/js/jquery/jquery.js
100%[===========================================>] 72,194 7.59K/s in 9.3s
2010-07-26 16:35:53 (7.59 KB/s) - `jquery.js' saved [72194/72194]
(NOTE that it took 9.3s to download a .js file)
Also, traceroute shows high latency when I test the server, but my brother tested from ISU and he also noticed the slow speed and he's on ISU's campus (not mediacom):
traceroute to www.bearfruit.org<http://www.bearfruit.org> (69.60.125.106), 30 hops max, 60 byte packets
1 buffalo.setup (192.168.1.1) 4.140 ms 7.958 ms 8.432 ms
2 10.19.76.1 (10.19.76.1) 16.084 ms 19.137 ms 19.232 ms
3 172.30.1.81 (172.30.1.81) 29.518 ms 29.621 ms 29.720 ms
4 172.30.1.53 (172.30.1.53) 27.287 ms 29.260 ms 28.953 ms
5 12-215-4-22.client.mchsi.com<http://12-215-4-22.client.mchsi.com> (12.215.4.22) 30.601 ms 229.057 ms 229.443 ms
6 cr84.cgcil.ip.att.net<http://cr84.cgcil.ip.att.net> (12.122.132.98) 231.008 ms 206.822 ms 332.461 ms
7 cr2.cgcil.ip.att.net<http://cr2.cgcil.ip.att.net> (12.123.7.250) 332.542 ms 332.699 ms 332.850 ms
8 cr1.n54ny.ip.att.net<http://cr1.n54ny.ip.att.net> (12.122.1.1) 333.005 ms 203.557 ms 203.937 ms
9 n54ny02jt.ip.att.net<http://n54ny02jt.ip.att.net> (12.122.80.225) 201.973 ms 205.819 ms 208.754 ms
10 192.205.37.134 (192.205.37.134) 208.838 ms 192.205.36.78 (192.205.36.78) 205.243 ms 192.205.37.134 (192.205.37.134) 208.864 ms
11 te0-2-0-4.ccr22.jfk02.atlas.cogentco.com<http://te0-2-0-4.ccr22.jfk02.atlas.cogentco.com> (154.54.1.217) 208.952 ms 209.012 ms te0-2-0-4.ccr21.jfk02.atlas.cogentco.com<http://te0-2-0-4.ccr21.jfk02.atlas.cogentco.com> (154.54.2.185) 430.110 ms
12 te0-0-0-2.ccr21.dca01.atlas.cogentco.com<http://te0-0-0-2.ccr21.dca01.atlas.cogentco.com> (154.54.25.238) 231.746 ms te0-1-0-7.ccr21.dca01.atlas.cogentco.com<http://te0-1-0-7.ccr21.dca01.atlas.cogentco.com> (154.54.26.6) 232.186 ms te0-2-0-7.ccr21.dca01.atlas.cogentco.com<http://te0-2-0-7.ccr21.dca01.atlas.cogentco.com> (154.54.41.1) 232.564 ms
13 te3-8.ccr02.atl01.atlas.cogentco.com<http://te3-8.ccr02.atl01.atlas.cogentco.com> (154.54.1.33) 232.975 ms te9-2.ccr01.atl01.atlas.cogentco.com<http://te9-2.ccr01.atl01.atlas.cogentco.com> (154.54.24.154) 233.059 ms te7-2.ccr01.atl01.atlas.cogentco.com<http://te7-2.ccr01.atl01.atlas.cogentco.com> (154.54.28.214) 227.670 ms
14 te3-4.ccr02.mia01.atlas.cogentco.com<http://te3-4.ccr02.mia01.atlas.cogentco.com> (154.54.3.26) 238.692 ms te3-1.ccr01.mia01.atlas.cogentco.com<http://te3-1.ccr01.mia01.atlas.cogentco.com> (154.54.30.34) 235.215 ms te3-1.ccr02.mia01.atlas.cogentco.com<http://te3-1.ccr02.mia01.atlas.cogentco.com> (154.54.26.10) 238.495 ms
15 vl3512.na21.b015452-0.mia01.atlas.cogentco.com<http://vl3512.na21.b015452-0.mia01.atlas.cogentco.com> (66.250.14.182) 235.593 ms 235.679 ms 236.002 ms
16 38.104.90.190 (38.104.90.190) 236.089 ms 237.478 ms 236.939 ms
17 233-160-111-65.serverpronto.com<http://233-160-111-65.serverpronto.com> (65.111.160.233) 237.884 ms 231.885 ms 228.001 ms
18 hosts.bearfruit.des-moines.ia.us<http://hosts.bearfruit.des-moines.ia.us> (69.60.125.106) 232.530 ms 232.364 ms 232.571 ms
--
Matthew Nuzum
newz2000 on freenode, skype, linkedin, identi.ca<http://identi.ca> and twitter
"Never stop learning" -Robert Nuzum (My dad)
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