[zeromq-dev] Windows multicast

[Steven McCoy]

On 24 April 2011 03:17, Robert Falcone <falcone.rob at gmail.com> wrote:

>   I am developing with MSVC++ 2010. I have read that it is tricky to get
> multicast (with openPGM) working with ZeroMQ on windows. I will be sending
> out market data at high rates and would love to test it out.
>
> Does anyone know if it is possible to use ZeroMQ to multicast?
>     If so can you please provide information on how to get it to work?
>
>
Grab an OpenPGM package from here,
http://見.香港/openpgm/<http://xn--nw2a.xn--j6w193g/openpgm/>


Then build ØMQ with ZMQ_HAVE_OPENPGM and include & lib paths set
appropriately.

I'm sure I wrote the OS configuration on the wiki somewhere, but I'm just
copying from previous mail.  Be prepared for poor performance if you don't
have TX & RX coalescing enabled and actually working, check with PerfMon
that the TX counter increments.  I've noted a problem with Broadcomm Server
NICs, meanwhile Linux and FreeBSD don't suffer these problems, go figure.

   - Disable the multimedia network throttling scheduler. By default Windows
   limits streams to 10,000 pps when a multimedia application is running.

Under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Multimedia\SystemProfileset
NetworkThrottlingIndex, type REG_DWORD32, value set to 0xffffffff.

   - Two settings define a IP stack path for datagrams, by default datagrams
   above 1024 go through a slow locked double buffer, increase this to the
   network MTU size, i.e. 1500 bytes.


   - Two settings define a IP stack path for datagrams, by default datagrams
   above 1024 go through a slow locked double buffer, increase this to the
   network MTU size, i.e. 1500 bytes.

Under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters:


   - FastSendDatagramThreshold, type REG_DWORD32, value set to 1500.
      - FastCopyReceiveThreshold, type REG_DWORD32, value set to 1500.


   - Unless you have hardware acceleration for timestamps incoming packets
   will be tagged with the receipt time at expense of processing time, disable
   the time stamps on both sides. This is performed by means of the following
   command:

netsh int tcp set global timestamps=disabled


   - A firewall will intercept all packets causing increased latency and
   processing time, disable the filtering and firewall services to ensure
   direct network access, disable the following services:
      - Base Filtering Engine (BFE)
      - Windows Firewall (MpsSvc)


You will need to reboot for the registry settings to be applied to the
system.

You can get better latency using Microsoft's ConCRT but it forces you to a
C++ main call and presumably limits the MSVC support.  That's more of a DIY
customization as OpenPGM is a C project.

-- 
Steve-o
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