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authorEric Dumazet <dada1@cosmosbay.com>2007-02-22 03:20:44 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:23:21 -0700
commit54287cc178cf85dbae0decec8b4dc190bff757ad (patch)
tree44dedf7be5ac37fae65718d359ff598902247753 /include
parentcf4c6bf83d0fa070f60b1ba8124dfe0e65fbfbcc (diff)
[TCP]: Keep copied_seq, rcv_wup and rcv_next together.
I noticed in oprofile study a cache miss in tcp_rcv_established() to read copied_seq. ffffffff80400a80 <tcp_rcv_established>: /* tcp_rcv_established total: 4034293   2.0400 */  55493  0.0281 :ffffffff80400bc9:   mov    0x4c8(%r12),%eax copied_seq 543103  0.2746 :ffffffff80400bd1:   cmp    0x3e0(%r12),%eax   rcv_nxt     if (tp->copied_seq == tp->rcv_nxt &&         len - tcp_header_len <= tp->ucopy.len) { In this function, the cache line 0x4c0 -> 0x500 is used only for this reading 'copied_seq' field. rcv_wup and copied_seq should be next to rcv_nxt field, to lower number of active cache lines in hot paths. (tcp_rcv_established(), tcp_poll(), ...) As you suggested, I changed tcp_create_openreq_child() so that these fields are changed together, to avoid adding a new store buffer stall. Patch is 64bit friendly (no new hole because of alignment constraints) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/tcp.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 29d3089038a..415193e171e 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -242,6 +242,8 @@ struct tcp_sock {
* See RFC793 and RFC1122. The RFC writes these in capitals.
*/
u32 rcv_nxt; /* What we want to receive next */
+ u32 copied_seq; /* Head of yet unread data */
+ u32 rcv_wup; /* rcv_nxt on last window update sent */
u32 snd_nxt; /* Next sequence we send */
u32 snd_una; /* First byte we want an ack for */
@@ -307,10 +309,8 @@ struct tcp_sock {
struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
u32 rcv_wnd; /* Current receiver window */
- u32 rcv_wup; /* rcv_nxt on last window update sent */
u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
u32 pushed_seq; /* Last pushed seq, required to talk to windows */
- u32 copied_seq; /* Head of yet unread data */
/* SACKs data */
struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */