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Hi Graeme,
Graeme Fowler wrote:
> On Wed, 2009-04-29 at 15:05 +0200, "Götz Rieger" wrote:
>> I'm doing a load test now using The Grinder with four load test clients. The
>> problem I'm facing is an extremely uneven distribution of ActiveConn on the
>> real servers:
>
> OK...
>
>> [root@lvst1 ~]# ipvsadm -L -n
>> IP Virtual Server version 1.2.1 (size=4096)
>> Prot LocalAddress:Port Scheduler Flags
>> -> RemoteAddress:Port Forward Weight ActiveConn InActConn
>> TCP 194.xxx.xxx.xxx:80 rr
>> -> 192.168.xxx.xxx:80 Masq 1 137 421
>> -> 192.168.xxx.xxx:80 Masq 1 203 509
>> -> 192.168.xxx.xxx:80 Masq 1 0 630
>
> A larger number of ActiveConns indicates a machine which is slower to
> respond (that is, these connections have not reached TIME_WAIT or
> FIN_WAIT), or a machine which has KeepAlive switched on in Apache.
Sure, but the servers and the OS are configured exactly the same. And
Apache _is_ the same on all nodes because it resides on the NFS-share...
KeepAlive is actually switched on, but again on all web servers.
So I really don't understand this behaviour right now. If the uneven
distribution would always follow the same pattern, yes. But the servers
getting high/low load are swapping around.
> Of more significance to you during testing would be:
>
> ipvsadm -L -n --stats
> ipvsadm -L -n --rate
I had a look at the --stats output as well. It looks like the throughput
is nearly the same for the real servers.
What concerns me is the web server/s with the high ActiveConns is/are
actually heavily loaded and the other/s are idle... and this makes the
whole thing a problem.
Might be some intricacy of TCP/IP I don't know about or the use of
NFS... but I don't get it.
> BTW I presume you meant "lc" scheduler rather than "ll"?
Err, yes. :-)
Those load test runs where actually ok with the ActiveConns staying the
same all the time... so should I go with lc?
Thanks for replying.
Goetz
>
> Graeme
>
>
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