[exim] exim 4.7 slowness

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Author: CauBa
Date:  
To: exim-users
Subject: [exim] exim 4.7 slowness
Dear exim users/developers,

I upgraded exim from 4.69 to 4.73 a few weeks ago due to the vulnerability described in "http://www.exim.org/lurker/message/20101210.164935.385e04d0.en.html"


Since then, I notice that my system struggles to keep up with the volume of email that it had little problem handling in 4.69

Has anyone else seen a similar behaviour ?

The pertinent config settings are:

received_headers_max = 40
message_size_limit = 20M
recipients_max = 1000
queue_only          = yes
queue_run_max       = 250
remote_max_parallel = 50


connection_max_messages = 750

system info:
Linux 2.6.18-194.26.1.el5 #1 SMP
dual quad E5540 @ 2.53GHz (16 logical cores)
16GB RAM



typical daily stats for 4.73: 
Grand total summary
-------------------
                                                                  At least one address
  TOTAL               Volume   Messages Addresses     Hosts      Delayed       Failed
  Received              87GB     905747                  99    6693  0.7%      0  0.0%
  Delivered            110GB     1535583    1539352        14
  Rejects                           430                  12
  Temp Rejects                     3284                  27



Time spent on the queue: all messages
-------------------------------------

Under   1m    23750   3.1%    3.1%
        5m    47952   6.2%    9.3%
       15m    43763   5.7%   15.0%
       30m    44933   5.8%   20.8%
        1h    86275  11.2%   32.0%
        3h   240461  31.2%   63.3%  *****only 63% after 3h****
        6h   181135  23.5%   86.8%
       12h    89728  11.7%   98.5%
        1d     6163   0.8%   99.3%
Over    1d     5551   0.7%  100.0%


Time spent on the queue: messages with at least one remote delivery
-------------------------------------------------------------------

Under   1m    23750   3.1%    3.1%
        5m    47952   6.2%    9.3%
       15m    43763   5.7%   15.0%
       30m    44933   5.8%   20.8%
        1h    86275  11.2%   32.0%
        3h   240461  31.2%   63.3%
        6h   181133  23.5%   86.8%
       12h    89728  11.7%   98.5%
        1d     6161   0.8%   99.3%
Over    1d     5551   0.7%  100.0%





typical daily stats for exim-4.69-4

Grand total summary
-------------------
                                                                  At least one address
  TOTAL               Volume   Messages Addresses     Hosts      Delayed       Failed
  Received              80GB     789440                  98   53523  6.8%      0  0.0%
  Delivered            159GB     1572696    1582306        11
  Rejects                           950                   3
  Temp Rejects                    10250                  16



Time spent on the queue: all messages
-------------------------------------

Under   1m   237858  30.2%   30.2%
        5m   149936  19.0%   49.2%
       15m   148053  18.8%   68.0%
       30m   112415  14.3%   82.3%
        1h    95188  12.1%   94.3%
        3h    44596   5.7%  100.0%   *****100% after 3h****
        6h        2   0.0%  100.0%


Time spent on the queue: messages with at least one remote delivery
-------------------------------------------------------------------

Under   1m   237858  30.2%   30.2%
        5m   149936  19.0%   49.2%
       15m   148053  18.8%   68.0%
       30m   112415  14.3%   82.3%
        1h    95188  12.1%   94.3%
        3h    44596   5.7%  100.0%
        6h        2   0.0%  100.0%




Thank you in advance for anyone who takes the time to look at this.

Cau Ba