netdev - Re: [RFC PATCH 0/2] netdev: Add tracepoint to network/driver interface

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Message-ID: <20100409110420.GA16609@hmsreliant.think-freely.org>
Date:	Fri, 9 Apr 2010 07:04:20 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Koki Sanagi <sanagi.koki@...fujitsu.com>
Cc:	netdev@...r.kernel.org, izumi.taku@...fujitsu.com,
	kaneshige.kenji@...fujitsu.com, davem@...emloft.net
Subject: Re: [RFC PATCH 0/2] netdev: Add tracepoint to network/driver
 interface

On Fri, Apr 09, 2010 at 04:37:53PM +0900, Koki Sanagi wrote:
> These patches add tracepoints to network/driver interface.
> 
> These tracepoints are helpful to investigate whether a packet passes or not.
> For example, when Heart Beat is disconnected, that information is helpful
> to investigate the cause is whether driver/device side or not.
> 
> An output is below.
> 
>   sshd-2443  [001] 68238.415621: netdev_start_xmit: dev=eth3 skbaddr=f3db5138 len=114
> <idle>-0     [001] 68238.417058: netdev_receive_skb: dev=eth3 skbaddr=f3c81540 len=52
> <idle>-0     [001] 68238.704363: netdev_receive_skb: dev=eth3 skbaddr=f3c81540 len=100
>   sshd-2443  [001] 68238.705459: netdev_start_xmit: dev=eth3 skbaddr=f3db5138 len=114
> <idle>-0     [001] 68238.706891: netdev_receive_skb: dev=eth3 skbaddr=f3c81540 len=52
> <idle>-0     [001] 68238.878736: netdev_receive_skb: dev=eth3 skbaddr=f3c81540 len=100
>   sshd-2443  [001] 68238.880361: netdev_start_xmit: dev=eth3 skbaddr=f3db5138 len=114
> 
> As other use case I have, we can get throughput per interface with some sort of
> perf scripts. I plan to create it.
> 
> Thanks
> Koki Sanagi
> 
You can get a reasonable estimate of per-interface throughput using ethtool or
even ifconfig in a script.  What are the tracepoints needed for that?  Don't get
me wrong, I think these tracepoints could have some potential use thats not
covered by other tools, I just don't see the above as a conclusive reason to add
them.

Regards
Neil

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