I've updated to the latest stable version of qemu a few days ago and saw that every guest runs on at least about 20% cpu usage now even though they don't do anything at all. I switched back to the old stable (qemu-1.1.1-r1) and now the idle usage is again on 4-5% percent. I'll gonna stay with the old stable. Running guests with 20% cpu usage on idle isn't much, but it's a big regression from the old stable which i think should be fixed. By the way, i was thinking there was already an open bug. I was sure i saw it already somewhere some time ago. However i couldn't find the bug... emerge --info qemu Portage 2.1.11.31 (default/linux/amd64/10.0/no-multilib, gcc-4.5.4, glibc-2.15-r3, 3.5.7-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.5.7-gentoo-x86_64-Intel-R-_Xeon-R-_CPU_E5405_@_2.00GHz-with-gentoo-2.1 Timestamp of tree: Wed, 21 Nov 2012 05:15:01 +0000 ld GNU ld (GNU Binutils) 2.22 app-shells/bash: 4.2_p37 dev-lang/python: 2.7.3-r2, 3.2.3 dev-util/cmake: 2.8.9 dev-util/pkgconfig: 0.27.1 sys-apps/baselayout: 2.1-r1 sys-apps/openrc: 0.9.8.4 sys-apps/sandbox: 2.5 sys-devel/autoconf: 2.68 sys-devel/automake: 1.11.6 sys-devel/binutils: 2.22-r1 sys-devel/gcc: 4.5.4 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4-r1 sys-devel/make: 3.82-r3 sys-kernel/linux-headers: 3.4-r2 (virtual/os-headers) sys-libs/glibc: 2.15-r3 Repositories: gentoo x-local x11 sunrise virtualization ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native -fopenmp" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/openvpn/easy-rsa" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe -march=native -fopenmp" 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 protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FFLAGS="-O2 -pipe" GENTOO_MIRRORS=" http://gentoo.supp.name/ http://ftp.fi.muni.cz/pub/linux/gentoo/ http://gentoo.mirror.web4u.cz/ http://gentoo.mirror.dkm.cz/pub/gentoo/ http://gentoo.ynet.sk/pub" LANG="de_DE.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed -fopenmp" LINGUAS="en" MAKEOPTS="-j12" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --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="/home/clown/public/overlays/local /home/clown/public/overlays/layman/x11 /home/clown/public/overlays/layman/sunrise /home/clown/public/overlays/layman/virtualization" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage/" USE="acl acpi amd64 berkdb bzip2 cli cracklib crypt cups cxx dbus dri fortran gdbm gif gpm iconv ipv6 mmx modules mudflap ncurses nls nptl openmp pam pbm pcre png pppd readline session sqlite sse sse2 ssl ssse3 tcpd threads unicode zlib" 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" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" 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" 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 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" PHP_TARGETS="php5-3" PYTHON_TARGETS="python2_7 python3_2" QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby18 ruby19" SANE_BACKENDS="niash" 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, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= app-emulation/qemu-1.1.1-r1 was built with the following: USE="aio caps curl ncurses sasl spice vde vhost-net -alsa -bluetooth -brltty -debug -doc -fdt -opengl -pulseaudio -python -rbd -sdl -smartcard -static -tci -tls -usbredir -virtfs -xattr -xen -xfs" QEMU_SOFTMMU_TARGETS="i386 x86_64 (-alpha) (-arm) -cris (-m68k) -microblaze -microblazeel (-mips) -mips64 -mips64el -mipsel (-ppc) (-ppc64) -ppcemb -s390x -sh4 -sh4eb (-sparc) -sparc64 -xtensa -xtensaeb" QEMU_USER_TARGETS="i386 x86_64 (-alpha) (-arm) -armeb -cris (-m68k) -microblaze -microblazeel (-mips) -mipsel (-ppc) (-ppc64) -ppc64abi32 -s390x -sh4 -sh4eb (-sparc) -sparc32plus -sparc64 -unicore32" emerge -pv qemu These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild U ] app-emulation/qemu-1.1.2-r2 [1.1.1-r1] USE="aio caps curl jpeg%* ncurses png%* sasl spice threads%* uuid%* vde vhost-net vnc%* -alsa -bluetooth -brltty -debug -doc -fdt -mixemu% -opengl -pulseaudio -python -rbd -sdl -smartcard -static -systemtap% -tci -tls -usbredir -virtfs -xattr -xen -xfs" QEMU_SOFTMMU_TARGETS="i386 x86_64 -alpha -arm -cris -lm32% -m68k -microblaze -microblazeel -mips -mips64 -mips64el -mipsel -ppc -ppc64 -ppcemb -s390x -sh4 -sh4eb -sparc -sparc64 -xtensa -xtensaeb" QEMU_USER_TARGETS="i386 x86_64 -alpha -arm -armeb -cris -m68k -microblaze -microblazeel -mips -mipsel -ppc -ppc64 -ppc64abi32 -s390x -sh4 -sh4eb -sparc -sparc32plus -sparc64 -unicore32" 0 kB
Please retest with the current stable 1.2.2
I've updated to the latest stable qemu. Qemu runs fine now with ~2-4% cpu usage at idle, means this bug can be closed :) - Thx
