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    SubjectRe: Slow ethernet/NE2000 with all 1.3 kernels (1.2 is fine)
    On Tue, 7 May 1996, Jamie Lokier wrote:

    > I've done some tests sending raw ethernet packets using SOCK_PACKET,
    > with 1.2.13 and 1.3.81 on exactly the same machine. The software
    > configuration is identical (I simply brought up different kernels).
    > The program is included at the end of this message so people can see if
    > the same problem exists with non-NE2000 cards.
    >
    > I hope SOCK_PACKET has abolutely nothing to with the TCP window. The
    > ISA bus speed is the same for both kernels, as it's the same machine
    > within a few minutes.
    >
    > New summary: 1.2.13 -> ~ 1197k/s raw data transmission rate
    > 1.3.81 -> ~ 745k/s raw data transmission rate
    >
    > Included below are the detailed results and the program.
    >
    > Enjoy,
    > -- Jamie Lokier
    >
    > Results:
    >
    > Linux 1.2.13:
    >
    > mustelid:~# ./etherspray
    > Transmitted 7570000 bytes in 6.321147 seconds (1197.6k/sec).
    >
    > Linux 1.3.81:
    >
    > mustelid:~# ./etherspray
    > Socket destroy delayed (r=0 w=64740)
    > Transmitted 7570000 bytes in 10.091485 seconds (750.1k/sec).
    >
    > Linux 1.3.97 gives similar results to 1.3.81. (I tested it on
    > a similar, but different machine).

    I get pretty good performance on 1.3.99.

    abyss ~ #./etherspray
    Transmitted 7570000 bytes in 6.125325 seconds (1235.9k/sec).
    abyss ~ #./etherspray
    Transmitted 7570000 bytes in 6.123016 seconds (1236.3k/sec).
    abyss ~ #./etherspray
    Transmitted 7570000 bytes in 6.123433 seconds (1236.2k/sec).

    That's on a 3-Com 3c595 running in 10MBit mode.

    Brad Borgald Networks
    Computing Services University of New Brunswick
    Fredericton New Brunswick, Canada, Electrical Engineering
    p7gz@unb.ca root@force.crt .unb.ca bborgald@hhnov1.unb.ca
    Linux! Solomon, No Fear! GUS PnP, The North Face
    If I wanted to be able to spell, I would have taken Arts...
    #include <stddisclaim.h>



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