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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/net.h
parent1c5cae815d19ffe02bdfda1260949ef2b1806171 (diff)
downloadop-kernel-dev-228e548e602061b08ee8e8966f567c12aa079682.zip
op-kernel-dev-228e548e602061b08ee8e8966f567c12aa079682.tar.gz
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/net.h')
-rw-r--r--include/linux/net.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/net.h b/include/linux/net.h
index 94de83c..1da55e9 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -42,6 +42,7 @@
#define SYS_RECVMSG 17 /* sys_recvmsg(2) */
#define SYS_ACCEPT4 18 /* sys_accept4(2) */
#define SYS_RECVMMSG 19 /* sys_recvmmsg(2) */
+#define SYS_SENDMMSG 20 /* sys_sendmmsg(2) */
typedef enum {
SS_FREE = 0, /* not allocated */
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