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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
..
boot powerpc/85xx: Update dts for PCIe memory maps to match u-boot of Px020RDB 2011-04-04 09:30:40 -05:00
configs powerpc/pseries: Enable Chelsio network and iWARP drivers 2011-03-30 10:44:22 +11:00
include/asm net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
kernel Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
kvm KVM: PPC: Fix SPRG get/set for Book3S and BookE 2011-03-17 13:08:25 -03:00
lib powerpc: Ensure the else case of feature sections will fit 2011-01-21 14:08:33 +11:00
math-emu powerpc/85xx: Fix SPE float to integer conversion failure 2011-03-15 13:48:15 -05:00
mm Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
oprofile Fix common misspellings 2011-03-31 11:26:23 -03:00
platforms Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
sysdev Fix common misspellings 2011-03-31 11:26:23 -03:00
xmon lib, arch: add filter argument to show_mem and fix private implementations 2011-03-24 17:49:37 -07:00
Kconfig genirq: Remove the now obsolete config options and select statements 2011-03-30 14:13:23 +02:00
Kconfig.debug powerpc: Unconditionally enabled irq stacks 2010-06-15 15:02:37 +10:00
Makefile powerpc: Fix typo in uImage target 2010-08-24 15:26:32 +10:00
relocs_check.pl
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