2. Correct me if I am wrong but I thought EPGM was PGM implemented over UDP. If this is correct then after you create the datagram socket you can set the option IP_MULTICAST_TTL via setsockopt. I do not believe this is currently available in 0MQ. Is that correct?
3. Yes, I could provide a patch. I plan on using 0MQ to distribute multiple prices feeds. It's not realistic to batch prices until you have a full UDP packet before sending them. This would add latency where it's not desired. I am assuming there is a timer tied to the queue which is performing this limit. Is that timer configurable and what is the default time interval? "There is no actual question about PGM congestion control?" - (1) Nagel addresses from a TCP/IP POV. (3) Addresses it from an EPGM POV Thanks Michael From: Steven McCoy [mailto:[email protected]] Sent: 13 May 2011 13:06 To: ZeroMQ development list Cc: Michael Holm Subject: Re: [zeromq-dev] EPGM Congestion Control On 13 May 2011 19:15, Martin Sustrik <[email protected]<mailto:[email protected]>> wrote: > 2.The EPGM interface does not allow you to set the time-to-live option > in the setsockopt method. There are no TTLs either in PGM or 0MQ. Do you mean IP TTL option? That's what I would guess, IPv4 TTL / IPv6 hop limit. > 3.When testing EPGM for throughput limits I discovered that all of the > messages are batched until a UDP packet is full before sending it. I do > not what this to occur. I want all messages to be sent as individual UDP > packets. There should be an option to configure this functionality. Sounds doable. Would you like to provide a patch? This is odd, for throughput you generally want less packets as current day technology cannot saturate Ethernet with very small packets. There is no actual question about PGM congestion control? -- Steve-o Tibra Trading Europe Limited is Authorised and Regulated by the FSA (Company No. 06061713) Tibra Global Services Pty Limited London Branch (Company No. BR014370) Tibra Equities Europe Limited (Company No. 07283912) Registered in England & Wales - Level 11, 5 Aldermanbury Square London EC2V 7HR The contents of this email including any attachments are confidential. If you have received this email in error, please advise the sender by return email and delete this email. Any unauthorised use of the contents of the email is prohibited and you must not disseminate, copy or distribute the message or use the information contained in the email or its attachments in any way. The views or opinions expressed are the author's own and may not reflect the views or opinions of Tibra. Tibra does not guarantee the integrity of any emails or attached files. E-mails may be interfered with, may contain computer viruses or other defects. Under no circumstances do we accept liability for any loss or damage which may result from your receipt of this message or any attachments.
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