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update highload documentation

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@ -49,28 +49,87 @@ expecation.
<h4>Extending system limitation</h4>
Check manuals / documentation for your system limitations. You may need to change
sysctls or even rebuild the kernel from source.
To help with system-dependant settings, 3proxy supports different socket options
which can be set via -ol option for listening socket, -oc for proxy-to-client
To help with system-dependant settings, since 0.9-devel 3proxy supports different
socket options which can be set via -ol option for listening socket, -oc for proxy-to-client
socket and -os for proxy-to-server socket. Example:
<pre>
proxy -olSO_REUSEADDR,SO_REUSEPORT -ocTCP_TIMESTAMPS,TCP_NODELAY -osTCP_NODELAY
</pre>
available options are system dependant.
<h4>Extending ephemeral port range</h4>
Check ephemeral port range for your system and extend it to reuired number of ports.
Ephimeral range is always limited to maximum number of ports (64K). To extend
outgoing connections above this limis, extending ephemeral port range is not enough,
you need additional actions:
Check ephemeral port range for your system and extend it to the number of the
ports required.
Ephimeral range is always limited to maximum number of ports (64K). To extend the
number of outgoing connections above this limit, extending ephemeral port range
is not enough, you need additional actions:
<ol>
<li> Configure multiple outgoing IPs
<li> Make sure 3proxy is configured to use different outgoing IP by either using
multiple services with different external interfaces or via "parent extip" rotation.
multiple services with different external interfaces
<pre>
allow user1,user11,user111
proxy -p1001 -e1.1.1.1
flush
allow user2,user22,user222
proxy -p1001 -e1.1.1.2
flush
allow user3,user33,user333
proxy -p1001 -e1.1.1.3
flush
allow user4,user44,user444
proxy -p1001 -e1.1.1.4
flush
</pre>
or via "parent extip" rotation,
e.g.
<pre>
allow user1,user11,user111
parent 1000 extip 1.1.1.1 0
allow user2,user22,user222
parent 1000 extip 1.1.1.2 0
allow user3,user33,user333
parent 1000 extip 1.1.1.3 0
allow user4,user44,user444
parent 1000 extip 1.1.1.4 0
proxy
</pre>
or
<pre>
allow *
parent 250 extip 1.1.1.1 0
parent 250 extip 1.1.1.2 0
parent 250 extip 1.1.1.3 0
parent 250 extip 1.1.1.4 0
socks
</pre>
<pre>
</pre>
Under latest Linux version you can also start multiple services with different
external addresses on the single port with SO_REUSEPORT on listening socket to
evenly distribute incoming connections between outgoing interfaces:
<pre>
socks -olSO_REUSEPORT -p3128 -e 1.1.1.1
socks -olSO_REUSEPORT -p3128 -e 1.1.1.2
socks -olSO_REUSEPORT -p3128 -e 1.1.1.3
socks -olSO_REUSEPORT -p3128 -e 1.1.1.4
</pre>
for Web browsing last two examples are not recommended, because same client can get
different external address for different requests, you should choose external
interface with user-based rules instead.
<li> You may need additional system dependant actions to use same port on different IPs,
usually by adding SO_REUSEADDR socket option to external socket. This option can be
set (since 0.9 devel) with -osSO_REUSEADDR option:
<pre>
proxy -p3128 -e1.2.3.4 -osSO_REUSEADDR
</pre>
Behavior for SO_REUSEADDR and SO_REUSEPOR is different between different system,
even between different kernel versions and can lead to unexpected results.
Specifics is described <a href="https://stackoverflow.com/questions/14388706/socket-options-so-reuseaddr-and-so-reuseport-how-do-they-differ-do-they-mean-t">here</a>.
Use this options only if actually required and if you fully understand possible
consiquences. E.g. SO_REUSEPORT can help to establish more connections than the
number of the client port available, but it can also lead to situation connections
are randomely fail due to ip+port pairs collision if remote or local system
doesn't support this trick.
</ol>
<h4>Setting stacksize</h4>
'stacksize' is a size added to all stack allocations and can be both positive and