Re: [DEBUG]: sk_forward_alloc assertion failures

[Nancy Milliner <njm@xxxxxxxxxx>]

Dave,

I've been running SPECweb99 with this patch all weekend and have not 
been able to produce any kernel assertions at all.  I'm currently 
running RH kernel 2.6.9-5.EL.root and have been able to reproduce at 
will when setting /proc/net/ipv4/tcp_tso_win_divisor to 1, 2 or 4.

Let me know when you have something else ready to test.

===== net/ipv4/tcp.c 1.88 vs edited =====
--- 1.88/net/ipv4/tcp.c 2005-01-06 15:13:39 -08:00
+++ edited/net/ipv4/tcp.c       2005-01-13 19:44:36 -08:00
@@ -664,7 +664,7 @@
                        if (!sk_stream_memory_free(sk))
                                goto wait_for_sndbuf;

-                       skb = sk_stream_alloc_pskb(sk, 0, tp->mss_cache,
+                       skb = sk_stream_alloc_pskb(sk, 0, 0,
                                                   sk->sk_allocation);
                        if (!skb)
                                goto wait_for_memory;
@@ -689,6 +689,9 @@

                skb->len += copy;
                skb->data_len += copy;
+               skb->truesize += copy;
+               sk->sk_wmem_queued += copy;
+               sk->sk_forward_alloc -= copy;
                skb->ip_summed = CHECKSUM_HW;
                tp->write_seq += copy;
                TCP_SKB_CB(skb)->end_seq += copy;