Guillaume Thouvenin [off-list ref] wrote:

  So I ran the lmbench with three different kernels with the fork
 connector patch I just sent. Results are attached at the end of the mail
 and there are three different lines which are:

 	o First line is  a linux-2.6.11-rc4-mm1-cnfork
 	o Second line is a linux-2.6.11-rc4-mm1
 	o Third line is  a linux-2.6.11-rc4-mm1-cnfork with a user space
           application. The user space application listened during 15h 
           and received 6496 messages.

 Each test has been ran only once. 

...
 ------------------------------------------------------------------------------
 Host                 OS  Mhz null null      open slct sig  sig  fork exec sh  
                              call  I/O stat clos TCP  inst hndl proc proc proc
 --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
 account   Linux 2.6.11- 2765 0.17 0.26 3.57 4.19 16.9 0.51 2.31 162. 629. 2415
 account   Linux 2.6.11- 2765 0.16 0.26 3.56 4.17 17.6 0.50 2.30 163. 628. 2417
 account   Linux 2.6.11- 2765 0.16 0.27 3.67 4.25 17.6 0.51 2.28 176. 664. 2456

This is the interesting bit, yes?  5-10% slowdown on fork is expected, but
why was exec slower?

What does "The user space application listened during 15h" mean?