The below is from running MTR for windows. I am starting to think this is problem is intermittent.
|------------------------------------------------------------------------------------------| | WinMTR statistics | | Host - % | Sent | Recv | Best | Avrg | Wrst | Last | |------------------------------------------------|------|------|------|------|------|------| | 192.168.0.1 - 0 | 394 | 394 | 0 | 0 | 16 | 0 | | 99.28.211.254 - 37 | 394 | 252 | 0 | 9 | 31 | 16 | | dist2-vlan60.stl2mo.sbcglobal.net - 42 | 394 | 231 | 0 | 9 | 16 | 16 | | bb2-g0-0.stl2mo.sbcglobal.net - 41 | 394 | 234 | 0 | 14 | 188 | 15 | | 151.164.99.189 - 46 | 394 | 216 | 15 | 34 | 234 | 15 | | te7-2.ccr02.ord03.atlas.cogentco.com - 48 | 393 | 206 | 15 | 21 | 203 | 16 | |te0-2-0-1.ccr22.ord01.atlas.cogentco.com - 44 | 393 | 224 | 15 | 16 | 32 | 31 | |te0-0-0-6.ccr22.yyz02.atlas.cogentco.com - 41 | 393 | 232 | 31 | 31 | 47 | 31 | | te4-4.mpd02.yyz02.atlas.cogentco.com - 58 | 393 | 167 | 31 | 36 | 188 | 31 | | 38.117.92.82 - 47 | 393 | 209 | 31 | 57 | 844 | 31 | | 69-10-224-202.onx.com - 50 | 393 | 198 | 31 | 32 | 47 | 31 | | 69-10-224-220.onx.com - 52 | 393 | 192 | 31 | 32 | 47 | 31 | | 74-213-166-67.ultrahosting.com - 44 | 393 | 221 | 31 | 32 | 141 | 31 | |________________________________________________|______|______|______|______|______|______| WinMTR - 0.8. Copyleft @2000-2002 Vasile Laurentiu Stanimir ( [email protected] ) Still frustrated. Cheers, Gazza On Sun, Jun 20, 2010 at 1:13 PM, Ross Vandegrift <[email protected]> wrote: > On Sat, Jun 19, 2010 at 02:16:42PM -0700, cd34 wrote: > > I did a quick run of ab, several requests came in at 3.1 seconds. I > > don't know what sort of network they are running, but 3 seconds seems > > very similar to an arp table rebuild in certain switches. When enough > > machines are put on a network, it overflows the 8192 record tcam (or > > whatever the limit is on that switch), which causes it to need to > > rebuild the arp tree as it rediscovers. Until each machine is > > rediscovered, they are basically 'off-net'. > > Such ARP table exhaustion would typically be steady-state in a > datacenter environment - a complete and total meltdown, never > recoverging. 3 seconds wouldn't be nearly enough time for such a > thing to wring out. Also, TCAM isn't used for ARP entries - lots of > things are stored in TCAM, but ARP isn't one of them. > > > I'd file a trouble ticket with them and let them know that you are > > seeing packet loss into their network and that you are seeing timeouts > > on requests going to your server and see what they say. I don't think > > your issue is software related - I agree that it looks like it is > > network related. > > If you opt to contact their support department, provide a traceroute > from your problamtic location to the destination that shows either > failing traceroutes or extended delays at the LAST HOP (the > intermediate hops don't matter). MTR is a nice program for generating > nice reports of this, but some NOCs want classic traceroute output. > > I don't see any evidence of a network issue, unless you were able to > measure the 6% packet loss only at the time of HTTP impact. I'm not > seeing any packet loss to 74.213.166.67 from my location, but it > appears that the HTTP service is stopped now. > > Are you hosting on a virtualized platform? I'd be suspicious of > platform performance issues. > > Ross > > -- > Ross Vandegrift > [email protected] > > "If the fight gets hot, the songs get hotter. If the going gets tough, > the songs get tougher." > --Woody Guthrie > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > > iEYEARECAAYFAkweWlQACgkQMlMoONfO+HDgugCfWATMenhPQbC+v/F8c6yG5I+P > NL4AnA7ZlXJy4kQpolujpZawMxzhskXD > =1keh > -----END PGP SIGNATURE----- > > -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/pylons-discuss?hl=en.
