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

David S. Miller (davem@redhat.com)
Wed, 21 Feb 2001 02:57:01 -0800 (PST)


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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