Wireshark for Lustre* -...

Wireshark for Lustre* Doug Oucharek April 17, 2013

Intel® High Performance Data Division * Other names and brands may be claimed as the property of others.

2 Intel® High Performance Data Division hpdd-‐[email protected]

What is Wireshark?

§  Protocol analyzer

§ Website: www.wireshark.org

§  Powerful filtering capabiliDes

§  Powerful analyDcs/staDsDcs

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Network Driver

Capture File

libpcap

User Space

Kernel Space

Wireshark tcpdump/dumpcap

Dissectors/plugins


Build and Install

Wireshark:

§  Latest Stable: 1.8.6 (recommended). Dev: 1.9.2

§  Requires: gtk2-‐devel and libpcap-‐devel (CentOS 6.x)

§  Usual: ./configure, make, make install

§  ApplicaDon: /usr/local/bin/wireshark

LNet/Lustre* Dissectors:

§  Need Wireshark source tree

§  Go to: lustre/contrib/wireshark (2.4 and up)

§  Update Makefile if not using package manager

§  Just run “make install” (“make clean” first if previously built)

§  Plugins: lnet.so and lustre.so 3


Checking for LNet and Lustre* Plugins

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Capturing Packets

§  Capture-‐>Interfaces

§  Click “Start” on interface to capture

§  Resource intensive

§  Use “tcpdump” or “ibdump”

§  (Go to:h_p://www.mellanox.com/content/pages.php?pg=products_dyn&product_family=110&menu_secDon=34)

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Wireshark Interface

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With Infiniband Packets

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Filtering Packets

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Changing Time Scale

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LNet Header

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Lustre* Header

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InteracFng with Fields

§  Clicking on field triggers hex to highlight

§  Also shows generated name for field (if any)

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Filter Tricks – Being Lazy

§  Right-‐Click on field

§  Use “Apply as Filter” to fill in filter field for you

§  Even works on text fields…which is what “dest_nid” is

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Protocol Hierarchy Window

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Packet Lengths

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Current: Flow Graph

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Future: Flow Graph

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I/O Graph

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I/O Graph -‐ Advanced

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Wireshark for Lustre* -...

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