At what (Slower) CPU Speed is a Gig-E NIC pointless?
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Quoted 19 lines · you
Quoted 17 lines · Peter T. Breuer
Quoted 11 lines · William Park
Quoted 7 lines
Quoted 2 lines · Keeg
At what speed (and maybe other factors, like memory?) does a gigabit ethernet NIC card become pointless?
A standard PCI bus is barely able to keep up with a busy 100 Mb NIC. It hasn't a hope of keeping up with Gigabit, no matter what CPU you have.
Wrong. 1Gigabit and 100Mbit translates to 100MB/s and 10MB/s (Byte per second), respectively, in real life. PCI bus has 133MB/s theoretical limit, but max out at about 100MB/s in real life.
Well, that's 32 bit, 33MHz PCI, no? I have 64 bit, 66MHz PCI myself! And 2 of them per board.
(server boards)
Quoted 8 lines
Quoted 3 lines
I have reports of people measuring 60MB/s across GE using my ENBD device. That must be on a fast bus, as the NIC and the scsi disks both need that bandwidth, and both are on PCI.
The best I could get out of 64bit PCI bus, using SAN FC cards, is about 100 MBytes/s (rw), guess the real bottleneck are the disks, many cheapo IDE stuff isn't even able to cope with 100 Mb/s LAN running at full speed. GB NICs only make really sense if your I/O can handle it...
Or if you are running a supercomputing centre, and the jobs your group run are primarily CPU intensive MPI jobs rather than disk bound.
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TimC -- http://astronomy.swin.edu.au/staff/tconnors/
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