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,
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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.
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.
Thank you for your reply. Here is the output I get:
cc -Wall -Wshadow -DBB_FEATURE_UDPCAST_FEC -D_FILE_OFFSET_BITS=64 -DUSE_SYSLOG -DNO_BB -c -o socklib.o socklib.c
socklib.c: In function 'udpc_getSendBuf':
socklib.c:280: warning: pointer targets in passing argument 5 of 'getsockopt' differ in signedness
socklib.c: In function 'udpc_getRcvBuf':
socklib.c:293: warning: pointer targets in passing argument 5 of 'getsockopt' differ in signedness
socklib.c: In function 'udpc_setTtl':
socklib.c:323: error: 'SOL_IP' undeclared (first use in this function)
socklib.c:323: error: (Each undeclared identifier is reported only once
socklib.c:323: error: for each function it appears in.)
socklib.c: In function 'mcastOp':
socklib.c:368: error: 'SOL_IP' undeclared (first use in this function)
make: *** [socklib.o] Error 1
Thank you for your help,
>>> D Teed <dteed(a)artistic.ca> 09/14/05 9:18 PM >>>
I suggest posting the actual error you got when you
tried to make the udpcast binaries. It could be
an ordinary dependancy or lib you don't have. Usually
the last 6 to 10 lines from a make error tell the tale
of what went wrong.
I've built udpcast on Sun with Linux, so I don't think
there is anything x86 centric about it.
On Wed, 14 Sep 2005, Jeff Michels wrote:
> I've been using UDPCast for about a year now and it has saved our school
> district from the cost of a commercial imaging program. I has also
> saved me many hours. For that I am grateful.
> Our district just purchased two Apple Servers. Currently I am using a
> 500 Mhz PIII box running Debian as our main image server. It has been
> extermely reliable and UDPCast works great however disk I / O and
> processing limitations are showing.
> I would like to compile UDPCast for OSX. I have a Powerbook with 10.4
> and the 2.1 Developer tools installed. I have tried to compile but was
> unsucessful. I have very limited coding skills so here is the
> information I need:
> 1. What do I need to do to get UDPCast to compile on OSX. If a total
> rewrite is needed, I will to lobby for a new(er) x86 box.
> 2. If anyone has done this I would like to read your experience.
> Thank you in advance for your help.
> Jeff Michels
> School District of Beloit
> Technology Support Specialist
> Udpcast mailing list
I use udpcast with several computers. After duplicating one hard disk to the
others, i would like that the computers that received the data reboot
automatically. But i don't know how to do this because udpcast don't allow
us to do that with it's options.
I'm waiting for your advice
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I'm trying to use udp-receiver with a inirrd (PXE) image from your web
with the portbase option. The client is configured to use port the 9600.
When I launch udp-sender --portbase 9600 option no client listen it.
However if I use the default port, it works fine. So clients are
listening at port 9000 instead of 9600 how I wanted :(
What I'm doing wrong?
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Facultad de Informática Tlf: +34 968 36 4827
Universidad de Murcia Fax: +34 968 36 4151
I would like to use an external, partitioned 250 GB HD to image 3 separate
XP computers each 30 GB in size. How do I do this so that if any one of the
3 computers' HD died, I could immediately copy the image for that computer
back to a new HD from the corresponding partition of the external HD so I
wouldn't have to go through the laborious setup process of installing
several of programs.
As I understand it Acronis and Norton Ghost will not allow copying an image
to a partitioned external drive - they demand using only one partition on
the external drive - thus 1 backup max per external HD.