linux_dsm_epyc7002/include
Eric Dumazet 2e77d89b2f net: avoid a pair of dst_hold()/dst_release() in ip_append_data()
We can reduce pressure on dst entry refcount that slowdown UDP transmit
path on SMP machines. This pressure is visible on RTP servers when
delivering content to mediagateways, especially big ones, handling
thousand of streams. Several cpus send UDP frames to the same
destination, hence use the same dst entry.

This patch makes ip_append_data() eventually steal the refcount its
callers had to take on the dst entry.

This doesnt avoid all refcounting, but still gives speedups on SMP,
on UDP/RAW transmit path

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-24 15:52:46 -08:00
..
acpi Merge branch 'ec' into release 2008-11-11 21:17:26 -05:00
asm-arm
asm-frv ide: fix support for IDE PCI controllers using MMIO on frv 2008-10-17 18:09:14 +02:00
asm-generic Fix __pfn_to_page(pfn) for CONFIG_DISCONTIGMEM=y 2008-11-08 10:02:48 -08:00
asm-h8300 h8300: update timer handler - new files 2008-10-16 11:21:29 -07:00
asm-m32r [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITY 2008-10-16 15:40:05 +02:00
asm-m68k proc: move /proc/hardware to m68k-specific code 2008-10-23 14:24:03 +04:00
asm-mn10300 [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITY 2008-10-16 15:40:05 +02:00
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 eth: Declare an optimized compare_ether_addr_64bits() function 2008-11-23 23:24:32 -08:00
math-emu math-emu: Fix thinko in _FP_DIV 2008-10-22 22:09:59 -07:00
media V4L/DVB (9335): videobuf: split unregister bus creating self-contained frontend de-allocator 2008-10-21 14:32:08 -02:00
mtd
net net: avoid a pair of dst_hold()/dst_release() in ip_append_data() 2008-11-24 15:52:46 -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 sched: clean up tracepoints 2008-10-14 10:33:14 +02:00
video atmel_lcdfb: change irq_base definition to allow error reporting 2008-11-12 17:17:16 -08:00
xen
Kbuild