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
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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.
--Donald Teed
Sorry, i replied directly to Alain... reposting to the list:
Begin forwarded message:
Date: Fri, 29 Apr 2005 14:49:36 +0200
From: Matteo Balduzzi <matteo.balduzzi(a)polimi.it>
To: Alain Knaff <alain(a)knaff.lu>
Subject: Re: [Udpcast] Udpcast and Vlans
On Fri, 29 Apr 2005 13:41:10 +0200
Alain Knaff <alain(a)knaff.lu> wrote:
> On Friday 29 April 2005 10:15, Matteo Balduzzi wrote:
> > Hi everybody, i'm using udpcast successfully since last year to
> > deploy windows partitions in our university.
> > The classrooms i manage are in different vlans, so now i store the
> > partition images on many server inside every single vlan.
> >
> > What i'd like to do now is to have a single server with vlan support
> > on its nic to do all the job. Well this seems not to work :-(
> > I mean: i can start the udpcast session, i see the clients
> > connetting,
> > i start sending data (which arrives to the clients) but it
> > seems that the replies get lost somewhere... i get for every single
> > client a "Timeout notAnswered ... notReady".
> >
> > The net guys here say that the net is correctly configured...
> > Finally: i'm doing something wrong? Does udpcast work on vlans (oh,
> > i'm using version 2005-02-26)? Experiences?
> >
> > Ciao, Matteo
>
> Could you run a "tcpdump -ni <vlanIf> port 9000 or port 9001" on the
> vlan interface on the sender, and tell me whether you see any reply
> received from the clients?
>
> Regards,
>
> Alain
>
Attached is an extract of a "tcpdump -ni eth0.735 port 9000", where
10.160.66.248 is the sender and 10.160.66.45 10.160.66.95 are the
receivers. It seems good to me... or not?
Matteo
--
Matteo Balduzzi
Area Sistemi Informatici
POLITECNICO DI MILANO
Via La Masa, 34 - 20156 Milano
Tel: 02-2399-8091
Fax: 02-2399-8088
Hi everybody, i'm using udpcast successfully since last year to deploy
windows partitions in our university.
The classrooms i manage are in different vlans, so now i store the
partition images on many server inside every single vlan.
What i'd like to do now is to have a single server with vlan support on
its nic to do all the job. Well this seems not to work :-(
I mean: i can start the udpcast session, i see the clients connetting,
i start sending data (which arrives to the clients) but it
seems that the replies get lost somewhere... i get for every single
client a "Timeout notAnswered ... notReady".
The net guys here say that the net is correctly configured...
Finally: i'm doing something wrong? Does udpcast work on vlans (oh, i'm
using version 2005-02-26)? Experiences?
Ciao, Matteo
--
Matteo Balduzzi
Area Sistemi Informatici
POLITECNICO DI MILANO
Via La Masa, 34 - 20156 Milano
