nixos/qemu-vm: Disable cache for $NIX_DISK_IMAGE
As @domenkozar noted in #10828, cache=writeback seems to do more harm than good: https://github.com/NixOS/nixpkgs/issues/10828#issuecomment-164426821 He has tested it using the openstack NixOS tests and found that cache=none significantly improves startup performance. Signed-off-by: aszlig <aszlig@redmoonstudios.org>
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@ -76,14 +76,14 @@ let
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-virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
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-virtfs local,path=''${SHARED_DIR:-$TMPDIR/xchg},security_model=none,mount_tag=shared \
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${if cfg.useBootLoader then ''
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-drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=writeback,werror=report \
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-drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=none,werror=report \
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-drive index=1,id=drive2,file=$TMPDIR/disk.img,media=disk \
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${if cfg.useEFIBoot then ''
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-pflash $TMPDIR/bios.bin \
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'' else ''
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''}
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'' else ''
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-drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=writeback,werror=report \
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-drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=none,werror=report \
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-kernel ${config.system.build.toplevel}/kernel \
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-initrd ${config.system.build.toplevel}/initrd \
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-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo} ${kernelConsole} $QEMU_KERNEL_PARAMS" \
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