Eric Dumazet 5635c10d97 net: make sure struct dst_entry refcount is aligned on 64 bytes ... As found in the past (commit f1dd9c379c [NET]: Fix tbench regression in 2.6.25-rc1), it is really important that struct dst_entry refcount is aligned on a cache line. We cannot use __atribute((aligned)), so manually pad the structure for 32 and 64 bit arches. for 32bit : offsetof(truct dst_entry, __refcnt) is 0x80 for 64bit : offsetof(truct dst_entry, __refcnt) is 0xc0 As it is not possible to guess at compile time cache line size, we use a generic value of 64 bytes, that satisfies many current arches. (Using 128 bytes alignment on 64bit arches would waste 64 bytes) Add a BUILD_BUG_ON to catch future updates to "struct dst_entry" dont break this alignment. "tbench 8" is 4.4 % faster on a dual quad core (HP BL460c G1), Intel E5450 @3.00GHz (2350 MB/s instead of 2250 MB/s) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2008-11-16 19:46:36 -08:00
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acpi	Merge branch 'linus' into test	2008-10-23 00:11:07 -04:00
asm-arm
asm-frv
asm-generic	Fix __pfn_to_page(pfn) for CONFIG_DISCONTIGMEM=y	2008-11-08 10:02:48 -08:00
asm-h8300
asm-m32r
asm-m68k	proc: move /proc/hardware to m68k-specific code	2008-10-23 14:24:03 +04:00
asm-mn10300
asm-x86	x86: add iomap_atomic*()/iounmap_atomic() on 32-bit using fixmaps	2008-10-31 10:12:38 +01:00
asm-xtensa	Merge git://git.kernel.org/pub/scm/linux/kernel/git/czankel/xtensa-2.6	2008-10-23 09:16:56 -07:00
crypto
drm	drm/i915: Filter pci devices based on PCI_CLASS_DISPLAY_VGA	2008-11-11 18:02:12 +10:00
keys
linux	udp: Use hlist_nulls in UDP RCU code	2008-11-16 19:39:21 -08:00
math-emu	math-emu: Fix thinko in _FP_DIV	2008-10-22 22:09:59 -07:00
media
mtd
net	net: make sure struct dst_entry refcount is aligned on 64 bytes	2008-11-16 19:46:36 -08:00
pcmcia
rdma
rxrpc
scsi	scsi: make sure that scsi_init_shared_tag_map() doesn't overwrite existing map	2008-10-27 19:25:30 +01:00
sound	Merge branches 'topic/fix/misc' and 'topic/fix/hda' into for-linus	2008-11-10 17:58:46 +01:00
trace
video
xen
Kbuild