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Old 12-09-2014, 01:13 AM   #1
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Packets per core analysis help needed

I have a 12 core CPU, out of which i use 6 core only and all my applications/threads are using those 6 cores only (0 to 5). Now i pump data and i want to analyse how many packets per core is being handled by the system. is there any command that gives number of packets being handled by each core? I tried SAR, not getting it

$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 12
On-line CPU(s) list: 0-11 (number of cores)
Old 12-26-2014, 07:12 AM   #2
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Originally Posted by debajiet View Post
is there any command that gives number of packets being handled by each core?
Generally speaking no. (What application? And "packets" of what exactly?) This is because when data transitions from user land to the kernel for processing the kernel efficiently combines ops in any way it sees fit and as ops may be redirected between cores there isn't, as far as I know, a non-invasive, easy way to make the kernel emit such statistics. Depending on what the application is or does, how it shows statistics (or anything in the verbose or debug output you could create stats from) combined with measuring per-core utilization you may be able to somehow divine what you're looking for. Do note however that, kind of Schroedingers Cat-wise, measuring core utilization itself may have an effect on core utilization :-]



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