[OpenAFS] Re: Speed of AFS

[Lars Schimmer]

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Mitch Collinsworth schrieb:

| The duplex mismatch issue is a huge speed killer, and none of the things
| you mentioned are relevent to verifying it.  If you have managed switches
| you need to make sure that either each switch port's duplex setting
| matches that of the machine or switch plugged into it.  In other words
| both ends of every cable must be configured the same.
|
| auto <--> auto
| full <--> full
| half <--> half
|
| Actually half <--> auto will work ok but the big thing many folks miss is
| that full <--> auto will NOT work correctly.  If you do this the auto end
| will configure itself to half and your throughput speed will be very
| slow on that connection.
|
| If you have unmanaged switches, every port is by default auto and you
| must make sure everything connected to it is set to auto.
|
| If you have any hubs, every port is by default half so you can set the
| devices it connects to to either auto or half but not full.
|
| Yes it's a bit confusing at first but it makes a huge difference.

Thx for your note, but the network here is built 4 years agon complete new and
the manageable nortel switche are new, to. Every PC should have FullDuplex
100Mbit in our net, if not, the hardware is not OK.
But to be safe, I managed to control some servers/clients, all FD, but our main
cell server had a 3com card set to 10MBit *WTF*, changed 10 min. ago. Now the
speed is under 3 MB, again. But with a quick glance on the server, the PII has
the HD in pio mode, so the fileserver is at 95% load for the PII, thats far to
much. I have to change the PC to a faster, stronger one :-)

| -Mitch

Cya
Lars
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Technische Universität Braunschweig, Institut für Computergraphik
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