• Koki Sanagi's avatar
    perf: Add a script to show packets processing · 359d5106
    Koki Sanagi authored
    Add a perf script which shows packets processing and processed
    time. It helps us to investigate networking or network devices.
    
    If you want to use it, install perf and record perf.data like
    following.
    
    If you set script, perf gathers records until it ends.
    If not, you must Ctrl-C to stop recording.
    
    And if you want a report from record,
    
    If you use some options, you can limit the output.
    Option is below.
    
    tx: show only tx packets processing
    rx: show only rx packets processing
    dev=: show processing on this device
    debug: work with debug mode. It shows buffer status.
    
    For example, if you want to show received packets processing
    associated with eth4,
    
    106133.171439sec cpu=0
      irq_entry(+0.000msec irq=24:eth4)
             |
      softirq_entry(+0.006msec)
             |
             |---netif_receive_skb(+0.010msec skb=f2d15900 len=100)
             |            |
             |      skb_copy_datagram_iovec(+0.039msec 10291::10291)
             |
      napi_poll_exit(+0.022msec eth4)
    
    This perf script helps us to analyze the processing time of a
    transmit/receive sequence.
    Signed-off-by: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
    Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
    Cc: Neil Horman <nhorman@tuxdriver.com>
    Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
    Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
    Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
    Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Eric Dumazet <eric.dumazet@gmail.com>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    LKML-Reference: <4C72439D.3040001@jp.fujitsu.com>
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    359d5106
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