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authorAnton Blanchard <anton@samba.org>2011-05-02 20:21:35 +0000
committerDavid S. Miller <davem@davemloft.net>2011-05-05 11:10:14 -0700
commit228e548e602061b08ee8e8966f567c12aa079682 (patch)
tree4c79ecf071d6174d42da1557812a4646d0aaa5af /include/linux/syscalls.h
parent1c5cae815d19ffe02bdfda1260949ef2b1806171 (diff)
net: Add sendmmsg socket system call
This patch adds a multiple message send syscall and is the send version of the existing recvmmsg syscall. This is heavily based on the patch by Arnaldo that added recvmmsg. I wrote a microbenchmark to test the performance gains of using this new syscall: http://ozlabs.org/~anton/junkcode/sendmmsg_test.c The test was run on a ppc64 box with a 10 Gbit network card. The benchmark can send both UDP and RAW ethernet packets. 64B UDP batch pkts/sec 1 804570 2 872800 (+ 8 %) 4 916556 (+14 %) 8 939712 (+17 %) 16 952688 (+18 %) 32 956448 (+19 %) 64 964800 (+20 %) 64B raw socket batch pkts/sec 1 1201449 2 1350028 (+12 %) 4 1461416 (+22 %) 8 1513080 (+26 %) 16 1541216 (+28 %) 32 1553440 (+29 %) 64 1557888 (+30 %) We see a 20% improvement in throughput on UDP send and 30% on raw socket send. [ Add sparc syscall entries. -DaveM ] Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/syscalls.h')
-rw-r--r--include/linux/syscalls.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 83ecc1749ef..ab71447d0c5 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -610,6 +610,8 @@ asmlinkage long sys_send(int, void __user *, size_t, unsigned);
asmlinkage long sys_sendto(int, void __user *, size_t, unsigned,
struct sockaddr __user *, int);
asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags);
+asmlinkage long sys_sendmmsg(int fd, struct mmsghdr __user *msg,
+ unsigned int vlen, unsigned flags);
asmlinkage long sys_recv(int, void __user *, size_t, unsigned);
asmlinkage long sys_recvfrom(int, void __user *, size_t, unsigned,
struct sockaddr __user *, int __user *);