I'm not very clear on what performance you want to improve. Boot time, normal use, or both? How often are these machines booted during the day?
What is the packet loss and response time accross your wireless link?
I too have 4 ltsp clients on the other side of a wireless link. My speed is 18Mbps duplex (9Mbps one way). I see only a slight difference when downloading the kernel etc. Other than that, performance is equal to wired side.
Christian
On 05/13/2004 02:51:41 PM, Luciano Andino wrote:
I'll make my best efford with my english:-)
I am using LTSP for about three years. Lan's topology consist of 15
diskless
workstastions (using 3COM's builtin eproms, 8139's with floppy from
rom-o-matic and 4 machines with builtin network that can networkboot).
All
works great in this config but... I add 5 new machines that are 180
meters
away from my LAN, in a another building.
Solution was bridging "two" networks with a pair of Linksys WAP54G
bridges:
xxxx xxxx xxxx xxxx
x x x x x x x x
xxxx xxxx ( ) xxxx xxxx
xxxxxx xxxxxx ( + + ) xxxxxx xxxxxx
xxxxxx xxxxxx |( + + + )| xxxxxx xxxxxx
| | [1] | ( + + ) | [2] | |
--+--------+---+BRIDGE+-+ ( ) +-wap54-------------
| | WAP54
xxxx xxxx perfect line sight "New segment added"
x x x x no other is using 6-port switch
xxxx xxxx the channel 3 Duron 2500+ in
xxxxxx xxxxxx Biostar mobo w/
xxxxxx xxxxxx sis900/via onboard
networkboot
2 terminals with
3COM905C-TX-M
"ACTUAL TOPOLOGY" NETWORK: 192.168.0.0 (the
same)
15 workstations
P4 Server w/768 RAM
HUB 100Mbps
NETWORK: 192.168.0.0
So, bridging unifies everything in one network. Transmit/Receive power
is excellent (I changed omni antenas for 24dB grid antennas). In the
new
building,
no machine has hard disk, when I power on a terminal, in 100 seconds
kdm login
appears (think that in normal conditions, it takes 25 secs).
Performance
is just fine, but graphically all is more slowly.
Every time machine boots, I receive "nfs server not responding, still
trying",
althought it can boot, it is due to network congestion (or packet loss
in
air).
I would like to get more performance in that new machines, I thought
to add
a Linux router+nfs+tft to server only the new machines, and for secure
the Lan
that has the machine where users has their accounts. This new machine
will
server
the kernel and filesystem for that 5 machine in one interface and
provide a
connection to the bigger Lan (in this case 192.168.0.0 the bigger
network and
192.168.1.0 for the remote's machines).
With this, I think I would get more performance if I reduce MTU for remote's machine if my problem is packet loss, so nfs and kdm connections will perform better, but I remember that a long time ago, I did it that and then receive a "Fragmented kernel". Maybe playing with rsize/wsize in nfs mounts wolud help. I also add security and reduce innecesary traffic in the wireless segment (if all is the same network).
Do you think it can be a good solution? is there another one?
Luciano Andino
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