[ovs-dev] How to use vlog in 'datapath' module?

[wenhao...@gmail.com]

hi all,

I'm trying to add something into datapath module and need to use vlog for 
debugging.

I tried to put 
#include "vlog.h" 
at the biginning of datapath.c as well as 
VLOG_DEFINE_THIS_MODULE(datapath);
I still got nothing in /var/log/openvswitch/ovs-vswitchd.log from the function
VLOG_INFO("HELLO WORLD");
in ovs_dp_process_packet function.

what should i do?

ps. I installed ovs 2.4.0 through .deb packages and runned ovs on mininet.

thanks,
Hs
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[ovs-dev] problems debugging datapath module

[wenhao...@gmail.com]

hi all,

I tried to put a "printk" line into the biginning of function 
"ovs_dp_process_packet", since i assumed that every packet appeared in the 
links to the switch will trigger that function. 

but when i updated ovs and start mininet with the modified ovs, i still cannot 
see the output of "printk" in syslog at /var/log after a "pingall" command. 
will the outcomes be put somewhere else? or did I missed something so that the 
"printk" didn't work?

Thanks a lot.

Hs.
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[ovs-dev] What time function is available in datapath module?

[wenhao...@gmail.com]

Hi all,
I used to use struct 'timeval' and function 'gettimeofday' from 'sys/time.h' to 
mesure time with an accuracy of μsecs. Since the datapath module runs in kernel 
mode, i wonder whether the function can still do the work, or any other 
functions can be used and offer such accuracy in this scenario.
thanks,
hs
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