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228e548e60
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Anton Blanchard 228e548e60 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>
2011-05-05 11:10:14 -07:00
..
acpi Fix common misspellings 2011-03-31 11:26:23 -03:00
asm-generic Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
crypto
drm Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
keys libceph: Create a new key type "ceph". 2011-03-29 12:11:24 -07:00
linux net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
math-emu
media Fix common misspellings 2011-03-31 11:26:23 -03:00
mtd
net net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
pcmcia
rdma ethtool: Call ethtool's get/set_settings callbacks with cleaned data 2011-04-29 14:01:30 -07:00
rxrpc Fix common misspellings 2011-03-31 11:26:23 -03:00
scsi Fix common misspellings 2011-03-31 11:26:23 -03:00
sound Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
staging [media] Altera FPGA firmware download module 2011-03-21 20:32:16 -03:00
target Fix common misspellings 2011-03-31 11:26:23 -03:00
trace Merge branch 'for-linus-unmerged' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2011-03-28 15:31:05 -07:00
video Fix common misspellings 2011-03-31 11:26:23 -03:00
xen Fix common misspellings 2011-03-31 11:26:23 -03:00
Kbuild