tcp: remove prequeue support

prequeue is a tcp receive optimization that moves part of rx processing
from bh to process context.

This only works if the socket being processed belongs to a process that
is blocked in recv on that socket.

In practice, this doesn't happen anymore that often because nowadays
servers tend to use an event driven (epoll) model.

Even normal client applications (web browsers) commonly use many tcp
connections in parallel.

This has measureable impact only in netperf (which uses plain recv and
thus allows prequeue use) from host to locally running vm (~4%), however,
there were no changes when using netperf between two physical hosts with
ixgbe interfaces.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 9 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 542ca1ae02c4..32fb37cfb0d1 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -192,15 +192,6 @@ struct tcp_sock {
 
         struct list_head tsq_node; /* anchor in tsq_tasklet.head list */
 
-        /* Data for direct copy to user */
-        struct {
-                struct sk_buff_head     prequeue;
-                struct task_struct      *task;
-                struct msghdr           *msg;
-                int                     memory;
-                int                     len;
-        } ucopy;
-
         u32     snd_wl1;        /* Sequence for window update           */
         u32     snd_wnd;        /* The window we expect to receive      */
         u32     max_window;     /* Maximal window ever seen from peer   */