Re: 2.4 tcp very slow under certain circumstances (Re: netdev issues (3c905B))

From: Ookhoi (ookhoi@dds.nl)
Date: Wed Feb 21 2001 - 12:17:01 EST


Hi David!

> > 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?

Yes, the problem is fixed! Thank you very much. :-) 'great' patch!

        Ookhoi

> --- 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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This archive was generated by hypermail 2b29 : Fri Feb 23 2001 - 21:00:25 EST