Talman, Knut wrote:
Dear all,
we have a site running SRSS 3.1.1 on RHEL 4.4 on a Sun X2200 M2. Currently
there are 12 Sunray 2 connected to the server. The colleagues working on it
are quite happy with it.
Not so our network administrator. He is complaining that the sunray server
generates massive UDP traffic ranging from 3Mbit/sec up to 16MBit/sec. I
know that server and client are communicating via UDP for input events and
rendering commands but that much traffic for just 12 clients? I am not a
network pro so I'd be happy if you could give me an indication where to
start digging.
It really depends entirely on what the users are doing. It also depends
on what else
is happening on the network. Sun Ray protocols are highly adaptive. If
there's an
empty pipe, they might use a fair chunk of it, but if the pipe is shared
with other
traffic they back off aggressively. So it's a bit like shouting in the
forest. Who
cares how loud you are if there is nobody there to hear you? The true
test is how
polite you are around others. Unless you are paying by the packet or
something,
which nobody does these days it seems.
These numbers also seem a bit off. It's easy to test this yourself by
running
'ethereal' (www.wireshark.com) on your Sun Ray server. It's like snoop but
has some nice extra features which help with this sort of analysis. As
root,
just capture your MAC address for a while (or IP address if you have a
router
in between the Sun Ray and server), and then pull down the statistics
menu to see how much bandwidth was utilized.
You're saying that, at the low end, each Sun Ray is consuming 3Mb/12 or
25Kb/s.
I just ran a test (as suggested above) using ethereal for an idle Sun
Ray, and over
my 30 second sample it consumed 4Kb/s. For 12 Sun Rays that's roughly
.5Mb/s.
I don't have a good test for the "high end", let alone a good definition
for what that
means, but if I constantly were changing the entire screen I wouldn't be
surprised
if I could push it up to near wire bandwidth if there were no other traffic.
FTP or any other TCP-based protocol behaves the same way. If you have an
empty network pipe, it'll use as much of it as it can. If there is
other traffic in
the pipe, it will back off to share the pipe fairly. This is what Sun
Ray protocol
does.
I hope this helps.
-Bob
Kind regards,
Knut Talman
CEVA Logistics GmbH; Sitz der Gesellschaft: Frankfurt/Main; Registergericht: Amtsgericht Frankfurt, HRB Nr. 73078; Geschäftsführer: Christian Fürstaller, Jens Müller, Andreas Wagner, Claus Dannenberg, Steven Ryan
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