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
..
001-usb-host-ehci-platform-BUG_ON-to-WARN_ON-on-probe.patch	generic/3.6: add platform specific power callbacks to {e,o}hci_platform drivers	2012-12-22 12:11:06 +00:00
002-usb-host-ohci-platform-BUG_ON-to-WARN_ON-on-probe.patch	generic/3.6: add platform specific power callbacks to {e,o}hci_platform drivers	2012-12-22 12:11:06 +00:00
003-usb-host-ehci-platform-add-platform-specific-power-c.patch	generic/3.6: add platform specific power callbacks to {e,o}hci_platform drivers	2012-12-22 12:11:06 +00:00
004-usb-host-ohci-platform-add-platform-specific-power-c.patch	generic/3.6: add platform specific power callbacks to {e,o}hci_platform drivers	2012-12-22 12:11:06 +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	linux/3.6: refresh patches	2013-02-01 17:30:15 +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
060-hso_devices.patch	kernel: update linux 3.6 to 3.6.5	2012-10-31 20:09:39 +00:00
060-tcp-ecn-dont-delay-ACKS-after-CE.patch
061-arm_xz_decompressor_build_fix.patch	ARM: fix XZ decompressor stub build failure on strstr()	2012-10-24 15:57:31 +00:00
062-mips_decompressor_build_fix.patch	generic: refresh 3.6 patches	2012-11-13 20:57:13 +00:00
065-8139cp-fixes.patch	generic: fix 8139cp patch for 3.6	2012-12-12 08:37:27 +00:00
084-perf_mkstemp_build_fix.patch	generic: refresh patches	2012-12-14 08:47:39 +00:00
084-x86_fix_perf_uclibc_build.patch	generic: refresh patches	2012-12-14 08:47:39 +00:00
090-CVE-2013-1763.patch	kernel: fix CVE-2013-1763 in older kernels	2013-05-12 10:55:12 +00:00
100-overlayfs.patch
102-ehci_hcd_ignore_oc.patch
110-fix_mtd_include.patch
131-atm-fixes.patch	Update linux-atm fixes to reflect the final upstream pull request	2012-12-02 13:04:04 +00:00
132-solos-dma.patch	kernel: add solos-pci patches from 3.8 for new hardware	2012-12-20 17:14:57 +00:00
200-fix_localversion.patch
201-extra_optimization.patch	build: unify target independent optimization options	2013-07-29 09:38:29 +00:00
202-reduce_module_size.patch
210-darwin_scripts_include.patch	kernel: patch in a working copy of elf.h instead of using relative path based hackery in #include statements	2012-12-02 15:26:19 +00:00
211-stddef_include.patch
212-byteshift_portability.patch	linux-3.6: fix portability of some includes files in tools/ used on the host	2012-11-04 17:01:15 +00:00
220-module_exports.patch	kernel: fix stripping symbol exports	2012-12-02 17:42:17 +00:00
230-openwrt_lzma_options.patch
250-netfilter_depends.patch
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
253-ssb_b43_default_on.patch
254-textsearch_kconfig_hacks.patch
255-lib80211_kconfig_hacks.patch
256-crypto_add_kconfig_prompts.patch
257-wireless_ext_kconfig_hack.patch
258-netfilter_netlink_kconfig_hack.patch
259-compressor_kconfig_hack.patch	kernel: make zlib and lzo modules selectable	2013-05-09 20:50:07 +00:00
260-move_bcm963xx_tag.patch	Revert "target specific patches have nothing to do in generic.."	2012-11-19 12:38:26 +00:00
270-regmap_dynamic.patch	kernel: set regmap-core module license	2013-03-17 19:45:48 +00:00
300-mips_expose_boot_raw.patch
301-mips_image_cmdline_hack.patch
302-mips_no_branch_likely.patch	mips: use -mno-branch-likely for kernel and userspace, saves ~11k kernel size after lzma and ~12k squashfs size in the default configuration	2012-12-28 19:17:19 +00:00
303-mips_fix_kexec.patch
304-mips_disable_fpu.patch
305-mips_module_reloc.patch	mips: use -mno-branch-likely for kernel and userspace, saves ~11k kernel size after lzma and ~12k squashfs size in the default configuration	2012-12-28 19:17:19 +00:00
306-mips_mem_functions_performance.patch
308-mips-show-correct-cpu-name-for-24KEc.patch
309-mips_fuse_workaround.patch
310-arm_module_unresolved_weak_sym.patch
320-ppc4xx_optimization.patch
321-powerpc_crtsavres_prereq.patch
322-ppc4xx-crypto-compile-fix.patch
330-mips-add-crash-and-kdump-support.patch
331-mips-kexec-enhanche-the-support.patch	generic: fix build failure in MIPS kexec code if SMP is enabled	2013-01-29 09:44:58 +00:00
332-mips-kexec-init-the-arguments-for-the-new-kernel-image.patch	generic: fix build failure in MIPS kexec code if SMP is enabled	2013-01-29 09:44:58 +00:00
333-mips-kexec-get-kernel-parameters-from-kexec-tools.patch	generic: fix build failure in MIPS kexec code if SMP is enabled	2013-01-29 09:44:58 +00:00
334-mips-fix-compiling-failure-of-relocate_kernel.patch
335-mips-kexec-cleanup-kexec-tools-parameter-handling.patch	generic: fix build failure in MIPS kexec code if SMP is enabled	2013-01-29 09:44:58 +00:00
340-module_alloc_size_check.patch	kernel: update linux 3.6 to 3.6.8	2012-11-29 07:42:19 +00:00
400-rootfs_split.patch	linux: generic: fix split_squashfs for 3.6	2012-11-06 00:48:21 +00:00
401-partial_eraseblock_write.patch
410-mtd_info_move_forward_decl.patch
420-redboot_space.patch
430-mtd_myloader_partition_parser.patch
440-block2mtd_init.patch
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
450-mtd_plat_nand_chip_fixup.patch
451-mtd_fix_nand_correct_data_return_code.patch
460-cfi_cmdset_0002_no_erase_suspend.patch
470-mtd_m25p80_add_pm25lv_flash_support.patch	linux/3.6: refresh patches	2013-02-01 17:30:15 +00:00
473-mtd_m25p80_add_w25q128.patch	linux/3.6: refresh patches	2013-02-01 17:30:15 +00:00
474-mtd_mp25p80_add_pm25lq032.patch	kernel: add missing bcma defines and header file for bcrmfmac	2013-04-28 11:10:42 +00:00
475-mtd_cfi_cmdset_0002-add-buffer-write-cmd-timeout.patch
476-mtd-m25p80-allow-to-disable-small-sector-erase.patch	kernel: add missing bcma defines and header file for bcrmfmac	2013-04-28 11:10:42 +00:00
477-mtd-m25p80-add-support-for-the-EON-EN25Q64-chip.patch
478-mtd-partial_eraseblock_unlock.patch
500-yaffs-Kbuild-integration.patch	generic: rename yaffs patches	2012-10-30 21:16:21 +00:00
501-yaffs-Fix-directory-unlinking-in-yaffs1-mode.patch	generic: replace yaffs symlink fix patch	2012-10-30 21:16:23 +00:00
502-yaffs-Switch-from-semaphores-to-mutexes.patch	generic: replace yaffs mutex_fix patch	2012-10-30 21:16:24 +00:00
503-yaffs-Replace-yaffs_dir_llseek-with-Linux-generic-ll.patch	generic: replace yaffs-2.6.39 patch	2012-10-31 15:12:45 +00:00
504-yaffs-Mods-for-Linux-3.0-and-fix-a-typo.patch	generic: replace yaffs-2.6.39 patch	2012-10-31 15:12:45 +00:00
505-yaffs-3.2-use-MTD_OPS_AUTO_OOB.patch	generic: split yaffs-3.2-fix patch	2012-10-31 19:33:12 +00:00
506-yaffs-3.2-dont-use-i_nlink-directly.patch	generic: split yaffs-3.2-fix patch	2012-10-31 19:33:12 +00:00
507-yaffs-3.3_fix.patch	generic: split yaffs-3.2-fix patch	2012-10-31 19:33:12 +00:00
508-yaffs-3.3-use-mtd_-helpers.patch	generic: use mtd_* helpers in the yaffs code	2012-10-31 21:17:30 +00:00
509-yaffs-3.4-add-underscore-to-mtd-internal-names.patch	generic: make yaffs work on 3.6	2012-11-01 11:07:23 +00:00
510-yaffs-3.4-use-d_make_root.patch	generic: make yaffs work on 3.6	2012-11-01 11:07:23 +00:00
511-yaffs-3.5-use-clear_inode.patch	generic: make yaffs work on 3.6	2012-11-01 11:07:23 +00:00
512-yaffs-3.5-convert-to-use-kuid_t-kgid_t.patch	generic: convert yaffs to use kuid_t and kgid_t on 3.6+	2012-11-20 17:45:24 +00:00
513-yaffs-3.6-fix-dir_inode-ops.patch	generic: convert yaffs to use kuid_t and kgid_t on 3.6+	2012-11-20 17:45:24 +00:00
514-yaffs-3.6-use-delayed-work-instead-of-write_super.patch	generic: convert yaffs to use kuid_t and kgid_t on 3.6+	2012-11-20 17:45:24 +00:00
520-squashfs_update_xz_comp_opts.patch
530-jffs2_make_lzma_available.patch	generic: rename jffs2 patches	2012-11-01 11:07:16 +00:00
531-debloat_lzma.patch	generic: rename jffs2 patches	2012-11-01 11:07:16 +00:00
532-jffs2_eofdetect.patch	generic: rename jffs2 patches	2012-11-01 11:07:16 +00:00
540-crypto-xz-decompression-support.patch
541-ubifs-xz-decompression-support.patch	generic: fix UBIFS build error if XZ compression is disabled	2013-01-02 08:53:07 +00:00
550-ubifs-symlink-xattr-support.patch
600-netfilter_layer7_2.22.patch
601-netfilter_layer7_pktmatch.patch
602-netfilter_layer7_match.patch
603-netfilter_layer7_2.6.36_fix.patch
604-netfilter_conntrack_flush.patch	linux/3.6: refresh patches	2013-02-01 17:30:15 +00:00
610-netfilter_match_bypass_default_checks.patch
611-netfilter_match_bypass_default_table.patch
612-netfilter_match_reduce_memory_access.patch
613-netfilter_optional_tcp_window_check.patch	generic: fix tcp_window_check patch for 3.6	2012-10-27 15:42:25 +00:00
620-sched_esfq.patch
621-sched_act_connmark.patch
630-packet_socket_type.patch
640-bridge_no_eap_forward.patch
641-bridge_always_accept_eap.patch
642-bridge_port_isolate.patch
643-bridge_remove_ipv6_dependency.patch	kernel: update linux 3.6 to 3.6.4	2012-10-28 18:59:39 +00:00
644-bridge_optimize_netfilter_hooks.patch
650-pppoe_header_pad.patch
651-wireless_mesh_header.patch
652-atm_header_changes.patch
653-disable_netlink_trim.patch	kernel: update linux 3.6 to 3.6.7	2012-11-18 08:41:31 +00:00
655-increase_skb_pad.patch	kernel: align the skb padding to power of two	2013-09-11 14:30:15 +00:00
700-swconfig.patch	generic: export include/linux/switch.h on 3.3, 3.6	2012-12-14 12:11:48 +00:00
701-phy_extension.patch
702-phy_add_aneg_done_function.patch
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
721-phy_packets.patch	kernel: allow __netdev_alloc_skb_ip_align to be called with dev = NULL	2013-04-22 15:01:36 +00:00
722-phy_mvswitch.patch
723-phy_ip175c.patch
724-phy_ar8216.patch
725-phy_rtl8306.patch
726-phy_rtl8366.patch
727-phy-rtl8367.patch
728-phy-micrel.patch
729-phy-rtl8367b.patch
729-phy-tantos.patch
730-phy_b53.patch	generic: add b53 swconfig switch driver	2013-01-23 10:12:33 +00:00
750-hostap_txpower.patch
800-usb-ohci-multiple-platform-driver-fix.patch	generic: add EHCI|OHCI platform driver fix to 3.[36]	2013-01-17 13:54:14 +00:00
801-usb-ehci-multiple-platform-driver-fix.patch	generic: add EHCI|OHCI platform driver fix to 3.[36]	2013-01-17 13:54:14 +00:00
810-pci_disable_common_quirks.patch	kernel: disable more pci quirks to save space on platforms that don't need them	2012-12-03 10:33:47 +00:00
811-pci_disable_usb_common_quirks.patch	generic: update pci_disable_usb_common_quirks patch	2012-12-14 08:32:56 +00:00
820-usb_add_usb_find_device_by_name.patch
830-ledtrig_morse.patch
831-ledtrig_netdev.patch
832-ledtrig_usbdev.patch
840-rtc7301.patch
841-rtc_pt7c4338.patch
861-04_spi_gpio_implement_spi_delay.patch
862-gpio_spi_driver.patch
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
880-gateworks_system_controller.patch	kernel: fix broken depends syntax introduced in r37933	2013-09-11 12:45:24 +00:00
900-slab_maxsize.patch
901-debloat_sock_diag.patch	kernel: update linux 3.6 to 3.6.11	2012-12-18 14:41:16 +00:00
902-debloat_proc.patch	kernel: do not strip /proc/net/ip_mr_* in the /proc debloat patch, it is used by iproute2	2013-05-02 15:59:57 +00:00
903-debloat_direct_io.patch	kernel: fix a warning in the O_DIRECT debloat patch	2012-12-17 20:55:49 +00:00
910-kobject_uevent.patch
911-kobject_add_broadcast_uevent.patch
921-use_preinit_as_init.patch	kernel: update linux 3.6 to 3.6.5	2012-10-31 20:09:39 +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
941-ocf_20120127.patch
950-vm_exports.patch	kernel: add missing bcma defines and header file for bcrmfmac	2013-04-28 11:10:42 +00:00
960-decompress_unlzo_fix.patch
970-remove-unsane-filenames-from-deps_initramfs-list.patch	generic: sanitize deps_initramfs list	2012-11-09 09:07:29 +00:00
980-arm_openwrt_machtypes.patch	add support for the Tonze AP-422/425	2012-11-11 21:04:30 +00:00
992-mpcore_wdt_fix_watchdog_counter_loading.patch
993-mpcore_wdt_fix_wdioc_setoptions_handling.patch
994-mpcore_wdt_fix_timer_mode_setup.patch
a02-swconfig-revert-portid-snd_portid-usage.patch	kernel: backport switch user API changes after r36283	2013-04-09 15:47:01 +00:00
a03-swconfig-revert-UAPI-disintegration.patch	kernel: backport switch user API changes after r36283	2013-04-09 15:47:01 +00:00