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In comp.os.linux.networking, you wrote: > Peter T. Breuer <ptb@oboe.it.uc3m.es> wrote: >> William Park <opengeometry@yahoo.ca> wrote: >>>> Keeg wrote: >>>> >>>>> 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) > >> 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. -- TimC -- http://astronomy.swin.edu.au/staff/tconnors/ double value; /* or your money back! */ short changed; /* so triple your money back! */ -- Larry Wall in cons.c from the perl source code - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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