100Mbps Ethernet Speed/Efficiency
Neall
neall at haughtmail.com
Tue Apr 6 22:56:08 UTC 2004
On Tue, 6 Apr 2004 at 3:38pm, Joel Jaeggli <joelja at darkwing.uoregon.edu>...:
> You can build a pretty wicked disk subsystem these days. single 15k rpm
> disk-drives can read a rate of around 86-78MB/s depending on what part of
Technology Marches on! My keeping up with it doesn't :)
> Do the machines in question have the ethernet in 64 bit pci slots?
It's an SBC, and ethernet is on board. The schematic shows an
interconnect via 64-bit PCI-X, 133 MHz, via an Intel 82870P2 PCI/PCI-X
hub. The eth chip itself is an Intel 82546EB. Dual Gigabit. Soldered
in. Copper trace PCI, but no plug-in connectors.
> block reads on 4GB files from a netap-940 we were testing were order of
> 83MB/s using jumbo 9k ethernet frames... dropping that to 1500mtu made it
Off topic (SORRY): Where do I tune these parameters in my NFS setup?
I'm actually running RHEL WS3.0 (not Fedora) but should be similar.
> desktop which just has 100baset. For small switched environments where
> performance is important unmanged gig copper switches now cost order of
> $20 a port or less, so if you need the speed it may be cheap.
Exactly, our plan is it run multiple SBCs but not have them communicate
over a backplane. Instead, using an unmanaged, copper giga switch and
Cat5E between them. :) Endpoints will be NFS-mounted RAM disks. You
folks are demonstrating to me that it's a pretty efficient pipeline.
Neall
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