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openwrt-owl/target/linux/generic/patches-3.8
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Felix Fietkau 8eb57d0cd7 kernel: align the skb padding to power of two 
The skb is usually started by a padding which allows the protocols in the
network stack to add their headers in front of the payload. The skb can be
reallocated in case the preallocated padding is not large enough. This can for
example happen in the function __skb_cow which will check the requested extra
headroom and allocate more buffer when the requested headroom is bigger than
the available one. The extra buffer is aligned again to the multiple of the
NET_SKB_PAD of the target architecture.

The macro used to create the multiple of the NET_SKB_PAD is written in a way
which allows only values power two as alignment parameter. The currently used
value of 48 bytes can not be written as n ** 2 but as 2 ** 4 + 2 ** 5. The
extra buffer is therefore not always the multiple of 48 but can be 16, 64, 80,
128, 144 and so on. The generated values are also not monotonic (48 requested
bytes are mapped to 80 allocated bytes and 49 requested bytes are mapped to 64
allocated bytes).

These unexpected small values result in more reallocations of the buffer. This
was noticed prominently during tests between two QCA9558 720 MHz devices which
were connected via ethernet to PCs and had a HT40 802.11n 3x3 link between each
other. The throughput PC-to-PC during iperf TCP runs increased reliable from
186 Mibit/s to 214 Mibit/s in one direction and from 195 Mibit/s to 220 Mibit/s
in the other direction. This is a performance increase of ~14% just by reducing
the amount of reallocations.

Signed-off-by: Sven Eckelmann <sven@open-mesh.com>

SVN-Revision: 37948
 		2013-09-11 14:30:15 +00:00
..
007-hso-Earlier-catch-of-error-condition.patch kernel: fix arch-dependent bug in hso module 2013-09-10 13:47:44 +00:00
008-hso-Fix-stack-corruption-on-some-architectures.patch kernel: fix arch-dependent bug in hso module 2013-09-10 13:47:44 +00:00
010-mtd_mp25p80_add_gd25q32_gd25q64.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
020-ssb_update.patch kernel: update bcma and ssb to version from wireless-testing/master tag master-2013-07-18 2013-07-19 12:02:34 +00:00
025-bcma_backport.patch kernel: update bcma and ssb to version from wireless-testing/master tag master-2013-07-18 2013-07-19 12:02:34 +00:00
026-bcma_pcie_up_down.patch kernel: fix DMA error when BCM4331 is connected to BCM4706 2013-08-05 16:17:05 +00:00
030-backport-lib-devres-Introduce-devm_ioremap_resource.patch linux/3.8: backport devm_ioremap_resource from 3.9 2013-04-06 17:33:00 +00:00
031-PCI-Remove-__weak-annotation-from-pcibios_get_phb_of.patch linux/3.8: use backported pcibios_get_phb_of_node patches 2013-04-30 10:44:07 +00:00
032-MIPS-PCI-Implement-pcibios_get_phb_of_node.patch linux/3.8: use backported pcibios_get_phb_of_node patches 2013-04-30 10:44:07 +00:00
033-backport-spi-of-Use-DT-aliases-for-assigning-bus-number.patch linux/3.8: backport 'spi/of: Use DT aliases for assigning bus number' from 3.9 2013-04-12 19:44:38 +00:00
040-backport_led_gpio_request_fix.patch kernel: refresh patches for kernel 3.8.13 2013-07-13 22:45:56 +00:00
060-hso_devices.patch kernel: update linux 3.8 to 3.8.6 2013-04-06 11:40:44 +00:00
061-arm_xz_decompressor_build_fix.patch
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062-mips_decompressor_build_fix.patch
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084-x86_fix_perf_uclibc_build.patch
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100-overlayfs.patch kernel: update linux 3.8 to 3.8.6 2013-04-06 11:40:44 +00:00
101-overlayfs_path_ref.patch kernel: fix a reference counting bug in overlayfs 2013-06-22 14:00:12 +00:00
102-ehci_hcd_ignore_oc.patch kernel: update linux 3.8 to 3.8.6 2013-04-06 11:40:44 +00:00
110-fix_mtd_include.patch
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200-fix_localversion.patch
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201-extra_optimization.patch build: unify target independent optimization options 2013-07-29 09:38:29 +00:00
202-reduce_module_size.patch
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203-kallsyms_uncompressed.patch kernel: port 203-kallsyms_uncompressed.patch and 305-mips_module_reloc.patch to 3.8 2013-01-14 18:55:36 +00:00
204-module_strip.patch kernel: refresh patches for kernel 3.8.13 2013-07-13 22:45:56 +00:00
210-darwin_scripts_include.patch
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212-byteshift_portability.patch
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220-gc_sections.patch kernel: prevent -f*-sections from leaking into the boot zImage wrapper on arm 2013-03-10 17:04:36 +00:00
221-module_exports.patch kernel: use -ffunction-sections, -fdata-sections and --gc-sections on mips 2013-01-26 16:26:13 +00:00
230-openwrt_lzma_options.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
250-netfilter_depends.patch kernel: refresh 3.8 patches 2013-01-17 22:28:53 +00:00
251-sound_kconfig.patch kernel: make SND_COMPRESS_OFFLOAD symbol visible for selection (#13193) 2013-03-19 14:13:39 +00:00
252-mv_cesa_depends.patch
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253-ssb_b43_default_on.patch
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254-textsearch_kconfig_hacks.patch
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255-lib80211_kconfig_hacks.patch
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256-crypto_add_kconfig_prompts.patch
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257-wireless_ext_kconfig_hack.patch
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258-netfilter_netlink_kconfig_hack.patch
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259-regmap_dynamic.patch kernel: REGMAP_SPI should only be selectable when SPI_MASTER is selected 2013-03-21 14:50:59 +00:00
260-crypto_test_dependencies.patch kernel: prevent cryptomgr from pulling in useless extra dependencies for tests that are not run 2013-01-27 16:21:08 +00:00
261-move_bcm963xx_tag.patch kernel: generic: add back the patch exporting bcm63xx tag header 2013-02-04 10:19:35 +00:00
262-compressor_kconfig_hack.patch kernel: make zlib and lzo modules selectable 2013-05-09 20:50:07 +00:00
300-mips_expose_boot_raw.patch
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301-mips_image_cmdline_hack.patch kernel: refresh 3.8 patches 2013-01-17 22:28:53 +00:00
302-mips_no_branch_likely.patch kernel: use -ffunction-sections, -fdata-sections and --gc-sections on mips 2013-01-26 16:26:13 +00:00
304-mips_disable_fpu.patch
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305-mips_module_reloc.patch kernel: use -ffunction-sections, -fdata-sections and --gc-sections on ARM to reduce kernel image size, disable those flags when tracing on MIPS to fix compile errors 2013-03-10 14:51:42 +00:00
306-mips_mem_functions_performance.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
308-mips-show-correct-cpu-name-for-24KEc.patch
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309-mips_fuse_workaround.patch
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310-arm_module_unresolved_weak_sym.patch
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320-ppc4xx_optimization.patch
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321-powerpc_crtsavres_prereq.patch
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322-ppc4xx-crypto-compile-fix.patch
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400-rootfs_split.patch kernel: fix a memory leak in split_rootfs_data() 2013-04-28 17:01:56 +00:00
401-partial_eraseblock_write.patch
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410-mtd_info_move_forward_decl.patch
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420-redboot_space.patch
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430-mtd_myloader_partition_parser.patch
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440-block2mtd_init.patch
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441-block2mtd_refresh.patch kernel: fixing a potential deadlock in block2mtd for kernel 3.6/3.8/3.9 2013-08-26 17:47:14 +00:00
442-block2mtd_probe.patch
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450-mtd_plat_nand_chip_fixup.patch kernel: update linux 3.8 to 3.8.6 2013-04-06 11:40:44 +00:00
451-mtd_fix_nand_correct_data_return_code.patch
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460-cfi_cmdset_0002_no_erase_suspend.patch
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470-mtd_m25p80_add_pm25lv_flash_support.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
473-mtd_m25p80_add_w25q128.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
474-mtd_mp25p80_add_pm25lq032.patch kernel: update linux 3.8 to 3.8.7 2013-04-14 09:25:53 +00:00
475-mtd_cfi_cmdset_0002-add-buffer-write-cmd-timeout.patch
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476-mtd-m25p80-allow-to-disable-small-sector-erase.patch kernel: update linux 3.8 to 3.8.7 2013-04-14 09:25:53 +00:00
478-mtd-partial_eraseblock_unlock.patch
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500-yaffs-Kbuild-integration.patch
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501-yaffs-Fix-directory-unlinking-in-yaffs1-mode.patch
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502-yaffs-Switch-from-semaphores-to-mutexes.patch
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503-yaffs-Replace-yaffs_dir_llseek-with-Linux-generic-ll.patch
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504-yaffs-Mods-for-Linux-3.0-and-fix-a-typo.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
505-yaffs-3.2-use-MTD_OPS_AUTO_OOB.patch
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506-yaffs-3.2-dont-use-i_nlink-directly.patch
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507-yaffs-3.3_fix.patch
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508-yaffs-3.3-use-mtd_-helpers.patch
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509-yaffs-3.4-add-underscore-to-mtd-internal-names.patch
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510-yaffs-3.4-use-d_make_root.patch
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511-yaffs-3.5-use-clear_inode.patch
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512-yaffs-3.5-convert-to-use-kuid_t-kgid_t.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
513-yaffs-3.6-fix-dir_inode-ops.patch
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514-yaffs-3.6-use-delayed-work-instead-of-write_super.patch
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520-squashfs_update_xz_comp_opts.patch
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530-jffs2_make_lzma_available.patch
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531-debloat_lzma.patch kernel: refresh patches for kernel 3.8.13 2013-07-13 22:45:56 +00:00
532-jffs2_eofdetect.patch
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540-crypto-xz-decompression-support.patch
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541-ubifs-xz-decompression-support.patch
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550-ubifs-symlink-xattr-support.patch
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551-ubifs-fix-default-compression-selection.patch generic: fix default compression selection in ubifs 2013-01-29 21:32:22 +00:00
600-netfilter_layer7_2.22.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
601-netfilter_layer7_pktmatch.patch
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602-netfilter_layer7_match.patch
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603-netfilter_layer7_2.6.36_fix.patch kernel: refresh 3.8 patches 2013-01-17 22:28:53 +00:00
604-netfilter_conntrack_flush.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
610-netfilter_match_bypass_default_checks.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
611-netfilter_match_bypass_default_table.patch
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612-netfilter_match_reduce_memory_access.patch
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613-netfilter_optional_tcp_window_check.patch
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620-sched_esfq.patch
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621-sched_act_connmark.patch
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630-packet_socket_type.patch kernel: update linux 3.8-rcX to 3.8 2013-02-19 09:17:38 +00:00
640-bridge_no_eap_forward.patch
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641-bridge_always_accept_eap.patch
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642-bridge_port_isolate.patch
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643-bridge_remove_ipv6_dependency.patch kernel: update linux 3.8 to 3.8.11 2013-05-01 22:15:18 +00:00
644-bridge_optimize_netfilter_hooks.patch kernel: update linux 3.8-rcX to 3.8 2013-02-19 09:17:38 +00:00
650-pppoe_header_pad.patch
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651-wireless_mesh_header.patch kernel: refresh 3.8 patches 2013-01-24 17:04:52 +00:00
652-atm_header_changes.patch
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653-disable_netlink_trim.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
655-increase_skb_pad.patch kernel: align the skb padding to power of two 2013-09-11 14:30:15 +00:00
656-skb_reduce_truesize-helper.patch kernel: add patches by Dave Täht to reduce buffer size in longer queues to reduce memory pressure 2013-04-10 13:11:16 +00:00
657-qdisc_reduce_truesize.patch kernel: update linux 3.8 to 3.8.7 2013-04-14 09:25:53 +00:00
660-fq_codel_defaults.patch kernel: tune fq_codel defaults for common netdevice speeds 2013-04-10 13:11:21 +00:00
661-fq_codel_keep_dropped_stats.patch kernel: keep dropped stats in fq_codel 2013-04-10 13:11:25 +00:00
662-use_fq_codel_by_default.patch kernel: force CONFIG_NET_SCHED=y for fq_codel (#13360) 2013-04-15 20:40:29 +00:00
663-remove_pfifo_fast.patch kernel: switch default qdisc from pfifo_fast to fq_codel and remove pfifo_fast 2013-04-10 13:11:29 +00:00
670-ipv6-allow-rejecting-with-source-address-failed-policy.patch kernel: refresh patches for kernel 3.8.13 2013-07-13 22:45:56 +00:00
700-swconfig.patch kernel: generic: add back the patch exporting bcm63xx tag header 2013-02-04 10:19:35 +00:00
701-phy_extension.patch
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702-phy_add_aneg_done_function.patch
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703-phy-add-detach-callback-to-struct-phy_driver.patch generic: add detach callback to struct phy_driver 2013-02-07 15:18:24 +00:00
710-phy-add-mdio_register_board_info.patch generic: add detach callback to struct phy_driver 2013-02-07 15:18:24 +00:00
720-phy_adm6996.patch
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721-phy_packets.patch kernel: update linux 3.8 to 3.8.11 2013-05-01 22:15:18 +00:00
722-phy_mvswitch.patch
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723-phy_ip175c.patch
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724-phy_ar8216.patch
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725-phy_rtl8306.patch
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726-phy_rtl8366.patch
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727-phy-rtl8367.patch
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728-phy-micrel.patch
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729-phy-rtl8367b.patch
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729-phy-tantos.patch
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730-phy_b53.patch generic: add b53 swconfig switch driver 2013-01-23 10:12:33 +00:00
750-hostap_txpower.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
800-usb-ohci-multiple-platform-driver-fix.patch generic: add EHCI|OHCI platform driver fix from the cns21xx target 2013-01-14 17:47:23 +00:00
810-pci_disable_common_quirks.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
811-pci_disable_usb_common_quirks.patch kernel: update linux 3.8-rcX to 3.8 2013-02-19 09:17:38 +00:00
820-usb_add_usb_find_device_by_name.patch kernel: update linux 3.8-rcX to 3.8 2013-02-19 09:17:38 +00:00
830-ledtrig_morse.patch
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831-ledtrig_netdev.patch
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832-ledtrig_usbdev.patch
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840-rtc7301.patch kernel: remove __devinit, __devexit and __devexit_p for kernel 3.8 2013-01-27 17:48:48 +00:00
841-rtc_pt7c4338.patch kernel: remove __devinit, __devexit and __devexit_p for kernel 3.8 2013-01-27 17:48:48 +00:00
861-04_spi_gpio_implement_spi_delay.patch
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862-gpio_spi_driver.patch kernel: remove __devinit, __devexit and __devexit_p for kernel 3.8 2013-01-27 17:48:48 +00:00
863-gpiommc.patch strict_strtoul is obsolete, use kstrtoul instead 2013-07-27 09:23:18 +00:00
864-gpiommc_configfs_locking.patch strict_strtoul is obsolete, use kstrtoul instead 2013-07-27 09:23:18 +00:00
870-hifn795x_byteswap.patch
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880-gateworks_system_controller.patch kernel: allow hwmon GSC driver for all targets 2013-09-10 22:26:30 +00:00
890-8250_optional_sysrq.patch kernel: do not accept sysrq characters via serial port 2013-07-09 12:52:00 +00:00
900-slab_maxsize.patch
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901-debloat_sock_diag.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
902-debloat_proc.patch kernel: refresh patches for kernel 3.8.13 2013-07-13 22:45:56 +00:00
903-debloat_direct_io.patch
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910-kobject_uevent.patch
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911-kobject_add_broadcast_uevent.patch
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921-use_preinit_as_init.patch kernel: update linux 3.8 to 3.8.6 2013-04-06 11:40:44 +00:00
922-always-create-console-node-in-initramfs.patch kernel: ensure that /dev/console exists in initramfs 2013-08-27 12:02:54 +00:00
930-crashlog.patch kernel: crashlog: Avoid out-of-bounds write 2013-08-21 20:59:25 +00:00
940-ocf_kbuild_integration.patch
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941-ocf_20120127.patch kernel: generic: update to 3.8-rc6 2013-02-04 10:19:28 +00:00
950-vm_exports.patch kernel: update linux 3.8 to 3.8.9 2013-04-26 16:55:42 +00:00
960-decompress_unlzo_fix.patch
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970-remove-unsane-filenames-from-deps_initramfs-list.patch
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980-arm_openwrt_machtypes.patch
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992-mpcore_wdt_fix_watchdog_counter_loading.patch kernel: update linux 3.8 to 3.8.3 2013-03-15 14:39:51 +00:00
993-mpcore_wdt_fix_wdioc_setoptions_handling.patch
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994-mpcore_wdt_fix_timer_mode_setup.patch
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995-mpcore_twd_calibrate_single_core.patch kernel: calibrate the TWD timer even when booting with only one CPU, it is used for the watchdog timer base 2013-04-10 16:07:50 +00:00
996-zsmalloc_allow_module_build.patch kernel: allow building zsmalloc as a module again 2013-05-09 19:19:36 +00:00
997-device_tree_cmdline.patch lantiq: enable retrieving kernel args from bootloader 2013-05-30 16:00:42 +00:00