Confusing data from cool new Epoptes benchmarking tool
The computers connected
to my slowest switch always boot almost a minute earlier than those
connected to my faster switch! And furthermore, the slower switch has to go through the faster switch to get to the server.
I've got a teacher-computer serving, via
ltsp-pnp, a classroom network with 30 fat clients. This server is
connected to a Netgear 24 port switch (model FSM 726) through 1 of its 2
gig ports: the rest of the ports are 100 MB.
The other gig
port on the Netgear switch is connected to a Cisco 24 port switch (only
has 100 MB ports) on the other side of the room.
Look if you will at the Epoptes benchmark tool results (http://tinyurl.com/p6ewzxa) the faster-booting computers that boot off the older Cisco switch average around 25 Mbps (7A-8B), this makes sense since they share a single 100 mb path to the server. The slower-booting computers that boot off the faster Netgear switch average around 70 Mbps.
these numbers all makes sense.
So, why do those last 4
computers, the ones averaging around 25 MB/s each, boot long before the
other 12 computers, even though those 12 computers are directly
connected to the first gig switch and are getting faster service
(apparently)? This doesn't seem a flow control issue since the benchmark clearly shows the slow-booting computers have faster communications.
Clue? the slow-booting computers take a loooong time to get an address from DHCP. Any ideas?
Re: Confusing data from cool new Epoptes benchmarking tool
Thanks Alkis! This is looking like I'll have to study/backup a bit deeper so I'll be testing this on this upcoming Thur/Fri after school. Quick question, I found this page: https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP. Will I need to make any adjustments for 14.04.3? David G
Adjusting pxelinux.cfg/default for Ubuntu 12.04
) | sudo tee -a /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default
Additional step for 12.04
ltsp-server does not install tftpd-hpa, which is a necessary component
needed in order to load tftp images to the client computers upon pxe
boot. The tftpd-hpa program listens on port 69, therefore in order to
transfer the ltsp image files to the clients it must be installed. There
is no additional configuring to do once it is installed. APT should
install and start the program, you do not have to "ltsp-update-image",