tcp: tsq: restore minimal amount of queueing

[~andy/linux] / net / ipv4 / tcp.c

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6e5617b9f9db6f3c2aeacc7923ea763660761d99..3dc0c6cf02a896e66071cd5f66b0a93f0dd3fc06 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -288,9 +288,11 @@ int sysctl_tcp_min_tso_segs __read_mostly = 2;
 struct percpu_counter tcp_orphan_count;
 EXPORT_SYMBOL_GPL(tcp_orphan_count);
 
+long sysctl_tcp_mem[3] __read_mostly;
 int sysctl_tcp_wmem[3] __read_mostly;
 int sysctl_tcp_rmem[3] __read_mostly;
 
+EXPORT_SYMBOL(sysctl_tcp_mem);
 EXPORT_SYMBOL(sysctl_tcp_rmem);
 EXPORT_SYMBOL(sysctl_tcp_wmem);
 
@@ -806,12 +808,6 @@ static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now,
                xmit_size_goal = min_t(u32, gso_size,
                                       sk->sk_gso_max_size - 1 - hlen);
 
-               /* TSQ : try to have at least two segments in flight
-                * (one in NIC TX ring, another in Qdisc)
-                */
-               xmit_size_goal = min_t(u32, xmit_size_goal,
-                                      sysctl_tcp_limit_output_bytes >> 1);
-
                xmit_size_goal = tcp_bound_to_half_wnd(tp, xmit_size_goal);
 
                /* We try hard to avoid divides here */
@@ -3097,13 +3093,13 @@ static int __init set_thash_entries(char *str)
 }
 __setup("thash_entries=", set_thash_entries);
 
-void tcp_init_mem(struct net *net)
+static void tcp_init_mem(void)
 {
        unsigned long limit = nr_free_buffer_pages() / 8;
        limit = max(limit, 128UL);
-       net->ipv4.sysctl_tcp_mem[0] = limit / 4 * 3;
-       net->ipv4.sysctl_tcp_mem[1] = limit;
-       net->ipv4.sysctl_tcp_mem[2] = net->ipv4.sysctl_tcp_mem[0] * 2;
+       sysctl_tcp_mem[0] = limit / 4 * 3;
+       sysctl_tcp_mem[1] = limit;
+       sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2;
 }
 
 void __init tcp_init(void)
@@ -3137,10 +3133,9 @@ void __init tcp_init(void)
                                        &tcp_hashinfo.ehash_mask,
                                        0,
                                        thash_entries ? 0 : 512 * 1024);
-       for (i = 0; i <= tcp_hashinfo.ehash_mask; i++) {
+       for (i = 0; i <= tcp_hashinfo.ehash_mask; i++)
                INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i);
-               INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].twchain, i);
-       }
+
        if (inet_ehash_locks_alloc(&tcp_hashinfo))
                panic("TCP: failed to alloc ehash_locks");
        tcp_hashinfo.bhash =
@@ -3166,7 +3161,7 @@ void __init tcp_init(void)
        sysctl_tcp_max_orphans = cnt / 2;
        sysctl_max_syn_backlog = max(128, cnt / 256);
 
-       tcp_init_mem(&init_net);
+       tcp_init_mem();
        /* Set per-socket limits to no more than 1/128 the pressure threshold */
        limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7);
        max_wshare = min(4UL*1024*1024, limit);