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                    netsniff-ng - the packet sniffing beast

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                                         .      .
netsniff-ng is a free, performant       /(      )\
Linux network analyzer and            .' {______} '.
networking toolkit. If you will,       \ ^,    ,^ /
the Swiss army knife for network        |'O\  /O'|   _.<0101011>--
packets.                                > `'  '` <  /
                                        ) ,.==., (  |
Web: http://netsniff-ng.org          .-(|/--~~--\|)-'
                                    (      ___
The gain of performance is           \__.=|___E
reached by built-in zero-copy
mechanisms, so that on packet reception and transmission the kernel does not
need to copy packets from kernel space to user space, and vice versa.

The netsniff-ng toolkit's primary usage goal is to facilitate a network
developer's / hacker's daily Linux plumbing. It can be used for network
development, debugging, analysis, auditing or network reconnaissance. It
consists of the following fixed set of utilities:

  * netsniff-ng: a zero-copy packet analyzer, pcap capturing/replaying tool
  * trafgen: a multithreaded low-level zero-copy network packet generator
  * mausezahn [*]: high-level packet generator for appliances with Cisco-CLI
  * ifpps: a top-like kernel networking and system statistics tool
  * curvetun [*]: a lightweight curve25519-based multiuser IP tunnel
  * astraceroute: an autonomous system trace route and DPI testing utility
  * flowtop: a top-like netfilter connection tracking tool
  * bpfc: a [seccomp-]BPF (Berkeley packet filter) compiler, JIT disassembler

Note that tools marked with [*] should be considered as experimental for now,
and not used in production environments as they still need more work to be
fully stable and in line with others. You have been warned!

Each release can be verified with Git and GPG, here are the steps to do so:

 1) Import the maintainers public keys:
   git show maint-tklauser-pgp-pub | gpg --import
   git show maint-dborkman-pgp-pub | gpg --import
 2) Verify the Git tag:
   git tag -v <tag-name>

Carefully read the INSTALL document for the next steps in building netsniff-ng.
Note that the toolkit is still quite young and under heavy development, not
yet feature complete and in a quality level where we're satisfied with (i.e.
for mausezahn). However, we're on a good way towards tackling all these goals.

The netsniff-ng toolkit is an open source project covered by the GNU General
Public License, version 2.0. For any questions or feedback about netsniff-ng
you are welcome to leave us a message at <netsniff-ng@googlegroups.com>.

netsniff-ng is non-profit and provided in the hope, that it is found useful.
The current project status can be considered as "working". In general, all tools
have been tested by us to a great extend including their command-line options.
In fact, many of our tools are used in a lot of production systems. However, we
give no guarantee that our tools are free of bugs! If you spot some issues,
contact us as described in REPORTING-BUGS. Also, have a look at our online FAQ
for answering your questions. This project has received support from companies
and institutions listed in the according section in the AUTHORS file. Thanks for
contributing, we're thrilled to provide you with netsniff-ng! Happy packet
hacking!
ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Christian Borntraeger &lt;borntraeger@de.ibm.com&gt;</td><td class='right'>2016-05-13 12:16:35 +0200</td></tr>
<tr><th>committer</th><td>Paolo Bonzini &lt;pbonzini@redhat.com&gt;</td><td class='right'>2016-05-13 17:29:23 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=3491caf2755e9f312666712510d80b00c81ff247'>3491caf2755e9f312666712510d80b00c81ff247</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=3491caf2755e9f312666712510d80b00c81ff247'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=3491caf2755e9f312666712510d80b00c81ff247'>2c26cb94956a74db734e110c51f600d28aedd5db</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=d7e1633abf9b1cc198bb673a59a01a3767f16b94'>d7e1633abf9b1cc198bb673a59a01a3767f16b94</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=3491caf2755e9f312666712510d80b00c81ff247&amp;id2=d7e1633abf9b1cc198bb673a59a01a3767f16b94'>diff</a>)</td></tr></table>
<div class='commit-subject'>KVM: halt_polling: provide a way to qualify wakeups during poll</div><div class='commit-msg'>Some wakeups should not be considered a sucessful poll. For example on
s390 I/O interrupts are usually floating, which means that _ALL_ CPUs
would be considered runnable - letting all vCPUs poll all the time for
transactional like workload, even if one vCPU would be enough.
This can result in huge CPU usage for large guests.
This patch lets architectures provide a way to qualify wakeups if they
should be considered a good/bad wakeups in regard to polls.

For s390 the implementation will fence of halt polling for anything but
known good, single vCPU events. The s390 implementation for floating
interrupts does a wakeup for one vCPU, but the interrupt will be delivered
by whatever CPU checks first for a pending interrupt. We prefer the
woken up CPU by marking the poll of this CPU as "good" poll.
This code will also mark several other wakeup reasons like IPI or
expired timers as "good". This will of course also mark some events as
not sucessful. As  KVM on z runs always as a 2nd level hypervisor,
we prefer to not poll, unless we are really sure, though.

This patch successfully limits the CPU usage for cases like uperf 1byte
transactional ping pong workload or wakeup heavy workload like OLTP
while still providing a proper speedup.

This also introduced a new vcpu stat "halt_poll_no_tuning" that marks
wakeups that are considered not good for polling.

Signed-off-by: Christian Borntraeger &lt;borntraeger@de.ibm.com&gt;
Acked-by: Radim Krčmář &lt;rkrcmar@redhat.com&gt; (for an earlier version)
Cc: David Matlack &lt;dmatlack@google.com&gt;
Cc: Wanpeng Li &lt;kernellwp@gmail.com&gt;
[Rename config symbol. - Paolo]
Signed-off-by: Paolo Bonzini &lt;pbonzini@redhat.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=3491caf2755e9f312666712510d80b00c81ff247'>Diffstat</a></div><table summary='diffstat' class='diffstat'>