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On Mon, Mar 28, 2016 at 10:37:57PM -0400, waltdnes@××××××××.org wrote |
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> I'm involved in beta testing Gstreamer 1.x support for HTML5 under |
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> Pale Moon (a Firefox fork). So far so good; it works. I use a QEMU VM |
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> for some building and testing. Things work great on a real physical |
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> machine, but audio absolutely sucks in the QEMU VM. I get an annoying |
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> warble-stutter and the playback seems a bit slower than it should be. |
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> The same thing also happens with mplayer playing a .wav file, so it's |
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> definitely not a Pale Moon browser problem. |
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> |
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> The VM gets 3 gigs of RAM (host has 8), 4 gigs of swap space, and 3 of |
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> the host's 4 cores. Resources should not be a problem. Has anybody got |
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> better performance? If so, what are your kernel and sound card settings? |
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The problem appears to be the "sdl" flag. It slows down things by |
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adding one more layer of middleware and overhead. I also got rid of the |
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"gtk2" flag, for the same reason. By building QEMU with "-sdl" and |
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"-gtk2", I get playback that is indistinguishable from playback on the |
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host. Here is the build that works properly "emerge -pv qemu"... |
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[ebuild R ] app-emulation/qemu-2.5.0-r1::gentoo USE="aio alsa curl |
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fdt gtk jpeg ncurses opengl pin-upstream-blobs png snappy ssh threads |
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usb vhost-net vnc -accessibility -bluetooth -caps -debug -filecaps |
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(-glusterfs) -gnutls -gtk2 -infiniband -iscsi -lzo -nfs -nls -numa |
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-pulseaudio -python -rbd -sasl -sdl -sdl2 -seccomp (-selinux) -smartcard |
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-spice -static -static-softmmu -static-user -systemtap -tci {-test} |
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-usbredir -uuid -vde -virgl -virtfs -vte -xattr -xen -xfs" |
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PYTHON_TARGETS="python2_7" QEMU_SOFTMMU_TARGETS="i386 x86_64 -aarch64 |
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-alpha -arm -cris -lm32 -m68k -microblaze -microblazeel -mips -mips64 |
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-mips64el -mipsel -moxie -or32 -ppc -ppc64 -ppcemb -s390x -sh4 -sh4eb |
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-sparc -sparc64 -tricore -unicore32 -xtensa -xtensaeb" |
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QEMU_USER_TARGETS="i386 x86_64 -aarch64 -alpha -arm -armeb -cris -m68k |
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-microblaze -microblazeel -mips -mips64 -mips64el -mipsel -mipsn32 |
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-mipsn32el -or32 -ppc -ppc64 -ppc64abi32 -ppc64le -s390x -sh4 -sh4eb |
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-sparc -sparc32plus -sparc64 -tilegx -unicore32" |
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-- |
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Walter Dnes <waltdnes@××××××××.org> |
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I don't run "desktop environments"; I run useful applications |
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