Any other suggestions? Another analysis of the logs shows that varnish
vs other backends (CouchDB) I see an order of magnitude higher
percentage of 3 second connection times with varnish.
Here's my varnish command options
http://friendpaste.com/1Zvj1XkX75eKqdzrJQZcfK and my sysctl changes
http://friendpaste.com/3lt3uhIm1NTNhrqGxvQEX6 the sysctl on haproxy is
identical.
If it makes a difference my VCL is pretty simple just with some header
rewrites, round robin for 8 backend servers, exclusions for certain
URI's and etc.
Thanks again!
-Joe
On 12/22/09 4:45 PM, Joe Williams wrote:
Michael,
I've looked at it for a bit and see 0's across the board for the
connections between the two machines.
To that end it looks like I rarely have above 500 connections into
varnish.
-Joe
On 12/22/09 3:24 PM, Michael Fischer wrote:
Are you seeing any increased TCP send queue lengths on the haproxy
side, or TCP receive queue lengths on the Varnish side? (netstat -a)
That might provide some clue as to what's going on.
--Michael
On Tue, Dec 22, 2009 at 2:58 PM, Henry Paulissen
<[email protected] <mailto:[email protected]>> wrote:
Have a look to the conntrack setting in the kernel (sysctl) on
both sides.
It could be that your conntrack is full (connectrack only exists
if you use
iptables with netfilter_conntrack).
Regards,
Henry
-----Oorspronkelijk bericht-----
Van: [email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] Namens Joe Williams
Verzonden: dinsdag 22 december 2009 18:12
Aan: [email protected]
<mailto:[email protected]>
Onderwerp: Slow connections
I am seeing a good amount (1/100) of connections to varnish (from
haproxy) taking 3 seconds. My first thought was the connection
backlog
but somaxconn and listen_depth are both set higher than the number of
connections. Anyone have any suggestions on how to track down what is
causing this or settings I can use to try to aleviate it?
Thanks.
-Joe
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