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    net: Add sendmmsg socket system call · 228e548e
    Anton Blanchard authored
    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: default avatarAnton Blanchard <anton@samba.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    228e548e