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authorEric Dumazet <edumazet@google.com>2020-04-17 07:10:23 -0700
committerDavid S. Miller <davem@davemloft.net>2020-04-18 15:47:28 -0700
commit9bacd256f1354883d3c1402655153367982bba49 (patch)
tree425e4d253f88dfe91c25fc0debefc7469a199afd /include/net
parent56e639e6a241de67488597fe2e07150f24ebc9de (diff)
tcp: cache line align MAX_TCP_HEADER
TCP stack is dumb in how it cooks its output packets. Depending on MAX_HEADER value, we might chose a bad ending point for the headers. If we align the end of TCP headers to cache line boundary, we make sure to always use the smallest number of cache lines, which always help. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/tcp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5fa9eacd965a..dcf9a72eeaa6 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -51,7 +51,7 @@ extern struct inet_hashinfo tcp_hashinfo;
extern struct percpu_counter tcp_orphan_count;
void tcp_time_wait(struct sock *sk, int state, int timeo);
-#define MAX_TCP_HEADER (128 + MAX_HEADER)
+#define MAX_TCP_HEADER L1_CACHE_ALIGN(128 + MAX_HEADER)
#define MAX_TCP_OPTION_SPACE 40
#define TCP_MIN_SND_MSS 48
#define TCP_MIN_GSO_SIZE (TCP_MIN_SND_MSS - MAX_TCP_OPTION_SPACE)