Unable to use PIE "Proportional Integral controller Enhanced" network scheduling algorithm module with tc, it reports "RTNETLINK answers: No such file or directory" when trying to use it. Steps to reproduce. 1. compile PIE as a kernel module in 3.14.14 gentoo-sources: CONFIG_NET_SCH_PIE=m 2. Boot into new kernel 3. Load kernel module: modprobe sch_pie 4. Confirm module is loaded: lsmod|grep -i pie 5. Apply scheduling to ethernet interface: /sbin/tc qdisc add dev eth0 root sch_pie I receive the below error: "RTNETLINK answers: No such file or directory" Installed: sys-apps/iproute2 3.8.0 gentoo-sources 3.14.14 Strace of step 5 above: execve("/sbin/tc", ["tc", "qdisc", "add", "dev", "eth0", "root", "sch_pie"], [/* 33 vars */]) = 0 brk(0) = 0x19d1000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f09fd2dc000 access("/etc/ld.so.preload", R_OK) = 0 open("/etc/ld.so.preload", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=29, ...}) = 0 mmap(NULL, 29, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = 0x7f09fd2db000 close(3) = 0 munmap(0x7f09fd2db000, 29) = 0 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=60856, ...}) = 0 mmap(NULL, 60856, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f09fd2cd000 close(3) = 0 open("/lib64/libm.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0Pj\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1042640, ...}) = 0 mmap(NULL, 3137848, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f09fcdbe000 mprotect(0x7f09fcebb000, 2097152, PROT_NONE) = 0 mmap(0x7f09fd0bb000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xfd000) = 0x7f09fd0bb000 close(3) = 0 open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\17\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=14624, ...}) = 0 mmap(NULL, 2109720, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f09fcbba000 mprotect(0x7f09fcbbc000, 2097152, PROT_NONE) = 0 mmap(0x7f09fcdbc000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f09fcdbc000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 N\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1724664, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f09fd2cc000 mmap(NULL, 3837016, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f09fc811000 mprotect(0x7f09fc9b0000, 2097152, PROT_NONE) = 0 mmap(0x7f09fcbb0000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19f000) = 0x7f09fcbb0000 mmap(0x7f09fcbb6000, 15448, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f09fcbb6000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f09fd2cb000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f09fd2ca000 arch_prctl(ARCH_SET_FS, 0x7f09fd2cb700) = 0 mprotect(0x7f09fcbb0000, 16384, PROT_READ) = 0 mprotect(0x7f09fcdbc000, 4096, PROT_READ) = 0 mprotect(0x7f09fd0bb000, 4096, PROT_READ) = 0 mprotect(0x640000, 4096, PROT_READ) = 0 mprotect(0x7f09fd2dd000, 4096, PROT_READ) = 0 munmap(0x7f09fd2cd000, 60856) = 0 brk(0) = 0x19d1000 brk(0x19f2000) = 0x19f2000 open("/proc/net/psched", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f09fd2db000 read(3, "000003e8 00000040 000f4240 3b9ac"..., 1024) = 36 close(3) = 0 munmap(0x7f09fd2db000, 4096) = 0 socket(PF_NETLINK, SOCK_RAW, 0) = 3 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [1048576], 4) = 0 bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0 getsockname(3, {sa_family=AF_NETLINK, pid=8214, groups=00000000}, [12]) = 0 open("/lib64/tc//q_sch_pie.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) sendto(3, "\34\0\0\0\22\0\1\3\2\27\340S\0\0\0\0\0\0\0\0\10\0\35\0\1\0\0\0", 28, 0, NULL, 0) = 28 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"P\2\0\0\20\0\2\0\2\27\340S\26 \0\0\0\0\4\3\1\0\0\0I\0\1\0\0\0\0\0"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 1200 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\24\0\0\0\3\0\2\0\2\27\340S\26 \0\0\0\0\0\0", 16384}], msg_controllen=0, msg_flags=0}, 0) = 20 sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"0\0\0\0$\0\5\6\3\27\340S\0\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0\377\377\377\377"..., 48}], msg_controllen=0, msg_flags=0}, 0) = 48 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"D\0\0\0\2\0\0\0\3\27\340S\26 \0\0\376\377\377\3770\0\0\0$\0\5\6\3\27\340S"..., 16384}], msg_controllen=0, msg_flags=0}, 0) = 68 write(2, "RTNETLINK answers: No such file "..., 45RTNETLINK answers: No such file or directory ) = 45 close(3) = 0 exit_group(2) = ? +++ exited with 2 +++ emerge --info Portage 2.2.8-r1 (default/linux/amd64/13.0, gcc-4.6.4, glibc-2.19-r1, 3.14.14-gentoo x86_64) ================================================================= System uname: Linux-3.14.14-gentoo-x86_64-Intel-R-_Core-TM-_i3_CPU_530_@_2.93GHz-with-gentoo-2.2 KiB Mem: 8163876 total, 2748088 free KiB Swap: 8388540 total, 8388540 free Timestamp of tree: Fri, 01 Aug 2014 15:30:01 +0000 ld GNU ld (Gentoo 2.23.2 p1.0) 2.23.2 app-shells/bash: 4.2_p45 dev-java/java-config: 2.2.0 dev-lang/python: 2.7.6, 3.2.5-r3, 3.3.3 dev-util/cmake: 2.8.12.2-r1 dev-util/pkgconfig: 0.28-r1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.69 sys-devel/automake: 1.11.1, 1.13.4 sys-devel/binutils: 2.23.2 sys-devel/gcc: 4.5.4, 4.6.4, 4.7.3-r1 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.2-r1 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.13 (virtual/os-headers) sys-libs/glibc: 2.19-r1 Repositories: gentoo mysql ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-march=native -O2 -pipe" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://mirror.datapipe.net/gentoo http://gentoo.mirrors.easynews.com/linux/gentoo/ http://www.gtlib.gatech.edu/pub/gentoo http://distro.ibiblio.org/pub/linux/distributions/gentoo/ http://lug.mtu.edu/gentoo/" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/var/lib/layman/mysql" USE="acl amd64 berkdb bzip2 cgi cli cracklib crypt cxx dri fortran gdbm iconv mmx modules multilib ncurses nls nptl nx openmp pam pcre pni readline session sse sse2 ssl tcpd unicode zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, SYNC, USE_PYTHON
I also have a forum post on this aswell: http://forums.gentoo.org/viewtopic-p-7594648.html#7594648
Please disregard this bug report, it turned out I was using the wrong scheduler name in the 'tc qdisc' command, also need to use a newer than 3.14 version of iproute2 (see previous forum post for more info)
