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    SubjectRE: 2.4 tcp very slow under certain circumstances (Re: netdev issues (3c905B))
    Date
    It looks like the patch fixed the problem.  TCP communications over modem
    seems fine now with the same settings that didnt' work earlier.

    -Vibol

    -----Original Message-----
    From: David S. Miller [mailto:davem@redhat.com]
    Sent: Wednesday, February 21, 2001 2:57 AM
    To: ookhoi@dds.nl
    Cc: Vibol Hou; Linux-Kernel; sim@stormix.com
    Subject: Re: 2.4 tcp very slow under certain circumstances (Re: netdev
    issues (3c905B))



    Ookhoi writes:
    > We have exactly the same problem but in our case it depends on the
    > following three conditions: 1, kernel 2.4 (2.2 is fine), 2, windows ip
    > header compression turned on, 3, a free internet access provider in
    > Holland called 'Wish' (which seemes to stand for 'I Wish I had a faster
    > connection').
    > If we remove one of the three conditions, the connection is oke. It is
    > only tcp which is affected.
    > A packet on its way from linux server to windows client seems to get
    > dropped once and retransmitted. This makes the connection _very_ slow.

    :-( I hate these buggy systems.

    Does this patch below fix the performance problem and are the windows
    clients win2000 or win95?

    --- include/net/ip.h.~1~ Mon Feb 19 00:12:31 2001
    +++ include/net/ip.h Wed Feb 21 02:56:15 2001
    @@ -190,9 +190,11 @@

    static inline void ip_select_ident(struct iphdr *iph, struct dst_entry
    *dst)
    {
    +#if 0
    if (iph->frag_off&__constant_htons(IP_DF))
    iph->id = 0;
    else
    +#endif
    __ip_select_ident(iph, dst);
    }


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