super slow speeds from director

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: super slow speeds from director
From: Matthew <matthew@xxxxxxxxxxxxxxxx>
Date: Tue, 20 Feb 2007 13:02:17 -0600
Hi gang,
 We've been running a 3 machine setup (1 dir, 2 rs) in TUN mode for
about the past 2 months.

 Recently we've had this affliction where if you goto,
everything is super ass slow. But if you goto (or
wwwdb2) everything is blazing fast.

 I'm talking huge differences here. People on a T1 downloading a file
from www are getting around 10KB/sec and that same file from wwwdb1 is
around 110KB/sec.

 This problem started this morning for the 2nd time. It happened about
2 weeks ago but we did nothing to the setup and the problem seemed to
fix itself. But now that it's happened again we need some answers.

Our config as of right now: (ip addys changed to protect the innocent)

.35  VIP (ip that points to)
.50  RS1
.130 RS2

[root@lb1 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP rr
  ->              Tunnel  1      12         95
  ->             Tunnel  1      12         107
TCP rr
  ->             Tunnel  1      18         1331
  ->            Tunnel  1      28         1351
TCP rr
  ->           Tunnel  1      4          0
  ->            Tunnel  1      5          0

We have 1 iptable rule on both RS's to combat the POST packet size issue:

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
TCPMSS     tcp  --           tcp
flags:0x16/0x12 TCPMSS set 1440

We've had this in place since Jan 3rd so I don't see how suddenly this
could be causing a problem.

Can anyone offer any suggestions on what to check, look for, diagnose,
etc on what this problem is?

I'd also add that my connection from home doesn't have this problem.
From home, www, wwwdb1, wwwdb2 are all blazing fast. But we just had a
customer call from Chicago who was getting slow speeds and here in our
office its slow as well to www but not to db1, db2.

Many Many Thanks in Advance for any Assistance.


<Prev in Thread] Current Thread [Next in Thread>