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| author | aszlig <aszlig@redmoonstudios.org> | 2015-12-14 17:36:22 +0100 |
|---|---|---|
| committer | aszlig <aszlig@redmoonstudios.org> | 2015-12-14 17:36:22 +0100 |
| commit | 6353f580f90c0fdd2b418fa853a78ec508bda2a5 (patch) | |
| tree | 5b642c51264c6452d49af1926ab492a6adb9f2a3 /nixos/modules/virtualisation | |
| parent | a5bc11f9eb70482daf559019f9b775c285defb63 (diff) | |
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nixos/qemu-vm: Disable cache for $NIX_DISK_IMAGE
As @domenkozar noted in #10828, cache=writeback seems to do more harm than good: https://github.com/NixOS/nixpkgs/issues/10828#issuecomment-164426821 He has tested it using the openstack NixOS tests and found that cache=none significantly improves startup performance. Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Diffstat (limited to 'nixos/modules/virtualisation')
| -rw-r--r-- | nixos/modules/virtualisation/qemu-vm.nix | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/nixos/modules/virtualisation/qemu-vm.nix b/nixos/modules/virtualisation/qemu-vm.nix index 0cefd618075c..e90e319a36ba 100644 --- a/nixos/modules/virtualisation/qemu-vm.nix +++ b/nixos/modules/virtualisation/qemu-vm.nix @@ -76,14 +76,14 @@ let -virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \ -virtfs local,path=''${SHARED_DIR:-$TMPDIR/xchg},security_model=none,mount_tag=shared \ ${if cfg.useBootLoader then '' - -drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=writeback,werror=report \ + -drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=none,werror=report \ -drive index=1,id=drive2,file=$TMPDIR/disk.img,media=disk \ ${if cfg.useEFIBoot then '' -pflash $TMPDIR/bios.bin \ '' else '' ''} '' else '' - -drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=writeback,werror=report \ + -drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=${cfg.qemu.diskInterface},cache=none,werror=report \ -kernel ${config.system.build.toplevel}/kernel \ -initrd ${config.system.build.toplevel}/initrd \ -append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo} ${kernelConsole} $QEMU_KERNEL_PARAMS" \ |