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Re: measuring network packets

From: Adrien Kunysz <adrien at kunysz dot be>
To: Mag Gam <magawake at gmail dot com>
Cc: systemtap at sourceware dot org
Date: Fri, 24 Dec 2010 05:25:59 +0000
Subject: Re: measuring network packets
References: <AANLkTikfxzaHtOEmScHEJy_+M17dmYEAe1GpCJXNmCjK@mail.gmail.com>

On Thu, Dec 23, 2010 at 06:21:56PM -0500, Mag Gam wrote:
> I want to know if there is a way to measure the time spent a IP packet
> going from application, kernel and to the NIC. Is this possible to do
> with systemtap?

You could set a probe on the system call the application is using to send
the data (probably syscall.send for UDP for example), another one on
netdev.hard_transmit (or on lower level function specific to the driver)
then measure the time between the two. I am not sure how accurate the
absolute value you would measure with this would be but it can certainly
be used for comparison when using the same methodology on other systems.

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References:
- measuring network packets
  - From: Mag Gam

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