Eric Dumazet eb6a24816b af_unix: reduce high order page allocations ... unix_dgram_sendmsg() currently builds linear skbs, and this can stress page allocator with high order page allocations. When memory gets fragmented, this can eventually fail. We can try to use order-2 allocations for skb head (SKB_MAX_ALLOC) plus up to 16 page fragments to lower pressure on buddy allocator. This patch has no effect on messages of less than 16064 bytes. (on 64bit arches with PAGE_SIZE=4096) For bigger messages (from 16065 to 81600 bytes), this patch brings reliability at the expense of performance penalty because of extra pages allocations. netperf -t DG_STREAM -T 0,2 -- -m 16064 -s 200000 ->4086040 Messages / 10s netperf -t DG_STREAM -T 0,2 -- -m 16068 -s 200000 ->3901747 Messages / 10s Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2012-04-03 16:43:18 -04:00
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af_unix.c	af_unix: reduce high order page allocations	2012-04-03 16:43:18 -04:00
diag.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-03-21 13:36:41 -07:00
garbage.c	Allow passing O_PATH descriptors via SCM_RIGHTS datagrams	2011-03-15 02:21:45 -04:00
Kconfig	net: Default UDP and UNIX diag to 'n'.	2012-01-07 12:13:06 -08:00
Makefile	unix_diag: Write it into kbuild	2011-12-16 13:48:29 -05:00
sysctl_net_unix.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00