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Old 07-30-2012, 08:52 AM   #1
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Registered: Jul 2012
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Linux networking buffers/queue monitoring

I need to display network queues by knowing its current queue length, maximum que length and drop statistic.

As far as i know, there a re 3 main queues/buffers in Linux which are socket buffer, queue discipline/backlog and ring descriptor buffer.

i had some hard time how to know the current queu length in the buffer expecially for queue discipline/backlog and ring descriptor buffer. Anyone know how i can get all this infromation?

By using what tool? Ftrace? bash scripting? kernel module? process file?

I did my reasearch for almost 6 month but still i didnt find any answer. Thats why i'm asking in forum for my final resort!
Old 07-30-2012, 05:39 PM   #2
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Quite an advanced Q for a linux newbie... Have you looked at iptables, I know you can filter input and create ques it may be what you need. I mean if you artificially create the ques, you should be able to read them in some file in /proc you will have to consult the man page. I'm not sure what you are trying, but you can have iptables log que lengths and monitor your kernel messages to perform some action?
Old 07-30-2012, 11:29 PM   #3
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I only want to monitor all the Linux buffers exist between TX to RX. I dont want to add any more queues. I try to find the bottleneck of the communication, where the drop are, what the state of those buffers at given time. Im working with communication between android phones.

Im monitoring my kernel message with ftrace. But i can't see the function invoke from the ring buffer which is in the NIC.

Maybe i can monitor the queue at socket buffer with proc/net/udp
and maybe i can count up how much bytes is occupied in the socket buffer by ftrace and reading out malloc_skb,put_skb,push_skb,kfree_skb etc and how many byte involved.

But im having difficulties with queueing discipline,backlog and tx and rx ring buffer since its in different level than socket buffer. Also, i dont know how can i get the information about how much buffers space is occupied at any given time. Where to look it?

Any idea? Anyone has been working with Linux networking buffers?


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