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    Subjectexperiences beyond 4 GB RAM with 2.4.22
    Hello,

    lately I upgraded my testbox from 2 to 6 GB ram and found out some oddities I
    would like to hear your opinions.
    The box ran flawlessly and performant with 2 GB - was in fact a real joy.
    After upgrading the ram and recompiling kernel 2.4.22 with support for 64 GB I
    noticed:

    1) nfs clients see timeouts again, like

    Sep 9 03:37:35 clienta kernel: nfs: server 192.168.1.1 not responding, still
    trying
    Sep 9 03:37:35 clienta kernel: nfs: server 192.168.1.1 OK
    Sep 9 03:37:35 clienta kernel: nfs: server 192.168.1.1 not responding, still
    trying
    Sep 9 03:37:35 clienta kernel: nfs: server 192.168.1.1 OK
    Sep 9 03:41:13 clienta kernel: nfs: server 192.168.1.1 not responding, still
    trying
    Sep 9 03:41:13 clienta kernel: nfs: server 192.168.1.1 OK

    Both are 2.4.22. 192.168.1.1 is the testbox. I saw those with 2GB, but could
    fix it through more nfs-daemons and

    echo 2097152 >/proc/sys/net/core/rmem_max
    echo 2097152 >/proc/sys/net/core/wmem_max

    Are these values too small for 6 GB?

    2) Box is very slow, kswapd looks very active during tar of a local harddisk.
    Interactivity is really bad. Seems vm has a high time looking for free or
    usable pages. Compared to 2 GB the behaviour is unbelievably bad.

    3) Network performance has a remarkable dropdown during above tar. In fact
    doing simple pings every few minutes shows that quite a lot of them are simply
    dropped, never make it over the ethernet.

    I am really astonished about this. Can some kind soul give me hints or maybe
    patches to try?

    Regards,
    Stephan
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