Hello Willy,
Thank you for your answer.
I will check the stats.
Is this "resonance problem" specific to haproxy?
Cheers,
Johan
----- Original Message -----
From: "Willy Tarreau" <[email protected]>
To: "Johan Duflost" <[email protected]>
Cc: "Angelo Höngens" <[email protected]>; <[email protected]>
Sent: Thursday, August 20, 2009 1:09 AM
Subject: Re: round robin
On Wed, Aug 19, 2009 at 08:43:34AM +0200, Johan Duflost wrote:
Hello,
Yes I know that session stickyness is enabled and this is what we need.
The problem is that when we make load tests with for example 10
concurrent
new users and 5 backend servers, we
noticed that some servers handle for example 4 users and other servers
handle only one. Is it normal?
no, but when running benchmarks, there is a well-known "resonance" problem
which sometimes occurs. If your injection scenario contains a number of
objects which is a multiple of the number of servers, you can sometimes
end up with user sessions always created on the same server. You should
check the stats and see how the load is spread in the LbTot column. If it
is imbalanced between the servers, there is a problem (then check the
Checks/Dwn column to see if one server is not flapping).
Willy
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