Udpcast April 2006

udpcast@udpcast.linux.lu

4 participants
5 discussions

Re: [Udpcast] Timeout , notAnswered, notReady
by Mike Drew 25 May '06

25 May '06

Thanks for your response, I think I encountered one of the "slow" machines today while I was running some tests. I guess there are just some slow ones in every group. I met with some network analysts from my university today and they explained how since the network is operating on a mixed CGMP/IGMPv2 environment multicasts are sometimes flaky. So, now that I may have found a source of the problem my question is if any has any experience using udpcast in a mixed environment, and if so what steps they took to make udpcast more reliable. And also if there is a version of udpcast that uses IGMPv2 rather than IGMPv3. Thank you, Mike

2 1

Timeout , notAnswered, notReady
by Mike Drew 28 Apr '06

28 Apr '06

Hello everyone, I recently started using udpcast and so far am very impressed. I am however having a problem. When I try to udpcast to 5 clients, 1-3 typically give an error similar to the following: Timeout notAnswered=[2,3,4] notReady=[2,3,4] nrAns=2 nrRead=2 nrPart=5 avg=10152 I've tried adjusting the transmission speed, multicast addresses, starting the clients before the server or vise-versa. So far it appears to be random which clients decide to "answer" and be "ready". Sometimes they all work, sometimes 4 work, sometimes only 1 works, etc. the lab I am working in is connected though a cisco 4006. From what I have read cisco uses a proprietary IGMP implementation (called CGMP), could this be a cause of some of the problems I am having? If anyone has any insight into this problem please reply. Thank you, Mike

2 1

UDPCast source code issues...
by Saikrishna Dasari 25 Apr '06

25 Apr '06

Hi Alain, I was studying the UDPCast source code for some experimental purposes. I have the following question. 1. The whole data to be transfered into is divided into slices which again contains a series of blocks to transfer. Can we consider the whole data to be transfered as a single slice ( By setting appropriate parameters in code) and what kind of performance issues we can expect if we do a change of this kind at code level. Thanks in advance, Sai --------------------------------- Do you Yahoo!? Y! Messenger - Communicate in real time. Download now.

3 2

Buggy tg3 ethernet
by Donald Teed 04 Apr '06

04 Apr '06

The option of ipappend 1 in the default file and retransmission of HELLOs in udp-sender (--rexmit-hello-interval) has been valuable to getting udpcast working with the Dell notebooks we have with Broadcom 5700 series ethernet. Today, with a slightly newer broadcom chipset appearing in the most recent shipment, we noticed that udp-receiver was intermittantly not showing the "hit any button to start transfer" message. With some trial and error I found that if I watched the tail of /var/log/message on the receiver (server) and waited for the messages on TX and RX flow control to complete before running udp-receiver, it would always initiate a good connection. If I had started the udp-receiver prior to the TX/RX flow control appearing in the message log (in which case there was no "hit any key" message), I could ^C the receiver, run it again and it would signify the ready state with 100% success. In conclusion, we have a workaround of starting udp-receiver after a few seconds past the client PXE machine booting and showing the udp-sender status ready (but not yet "hit any key..."). Another solution would be if udp-receiver also supported --rexmit-hello-interval. It isn't a flaw in the udpcast system but a kludge for a network device that is proving itself to be sluggish in initialization in general. --Donald Teed

2 1

Default boot not recognizing kb
by abarkley＠jamadots.com 04 Apr '06

04 Apr '06

I downloaded your CD image and it worked fine until I used it on a pc with a USB keyboard. These PCs are in the lab I am trying the program on. Do I need to compile my own image using my own kernal? I am using debian 3.1 and cannot find the required files as specified by the -k switch. Please, let me know what I need to do. Thanks, AJ

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Udpcast April 2006