Re: Some measurements on LTSP network usage
[Petter Reinholdtsen 2007-10-22]
> I just did a measurement on how much data is transfered to and from a
> thin client when it boots. I used 'iftop -i eth1' on the thin client
> server to measure this.
I redid this test now, booting from a cold machine until the login
screen is present, and got new numbers for the amount downloaded and
sent to get LTSP clients up and running.
2007 2014
received sent received sent
---------------- ---------------
Thin Client 42 MiB 3 MiB 187 MiB 6 MiB
Diskless WS 117 MiB 12 MiB 188 MiB 6 MiB
The 2014 test is using LTSP 5.5.3. Not sure which version we had in
2007. I only booted once, so the numbers might change a bit from boot
to boot.
The data transfer increase is quite horrible, and badly affect how many
clients can be booted at the same time. I suspect something is wrong
with the thin client case, given that there is so little difference to
the diskless workstation boot.
I also measured how much is transfered to log in until the system
settled, along with the amount of memory used on the client once logged
in (according to 'free -m', calculate 'ram used without buffers' +
swap):
2014
received sent memory
--------------------------
Thin Client KDE 28 MiB 6 MiB 76 MiB
Diskless WS KDE 767 MiB 252 MiB 466 MiB
We should try to bring down these numbers as well, to allow more users
to log in at the same time. A complete classroom full of clients should
be able to log in their machines using less than 5 minutes.
--
Happy hacking,
Petter Reinholdtsen
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