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    SubjectRe: Gigabit Linux Server Bottlenecks
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    >>>>> "Anton" == Anton Ivanov <aivanov@eu.level3.net> writes:

    Anton> On 08-Feb-2000 Jonathan Disher wrote:
    >>> maddening to the CPU. As I recall, the host must be able to
    >>> process around 82,000 packets (read "CPU interrupts") per second
    >>> to fill the pipe unidirectionally. Try this in a full duplex
    >>> setting with a 2 gig pipe to fill and you (at least) double the
    >>> amount of work the CPU needs to accomplish every second.
    >> IIRC, gigaether is actually 500mbit ethernet in full duplex mode.

    Anton> More complicated:

    Anton> In Full Duplex: it is 1 GBit

    1 GBit in each direction.

    Anton> In Half Duplex: Packets smaller than 640 (or 512, sorry do not
    Anton> remember) are padded to this value. So if you transmit 40 byte
    Anton> packets in half dupplex you get approx the performance of a 100
    Anton> MB in Full Duplex.

    Padding is only an issue for Half Duplex, nobody runs GigE at half
    duplex.

    Jes

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