Re: [Qemu-devel] [PATCH] qemu-img create: set nocow flag by default

2013-11-12 Thread Chunyan Liu
2013/11/12 Fam Zheng > On 2013年11月07日 16:08, Chunyan Liu wrote: > >> Set NOCOW flag to newly created images to solve performance issues on >> btrfs. >> >> Btrfs has terrible performance when hosting VM images, even more when the >> guest >> in those VM are also using btrfs as file system. One way

Re: [Qemu-devel] [PATCH] qemu-img create: set nocow flag by default

2013-11-11 Thread Fam Zheng
On 2013年11月07日 16:08, Chunyan Liu wrote: Set NOCOW flag to newly created images to solve performance issues on btrfs. Btrfs has terrible performance when hosting VM images, even more when the guest in those VM are also using btrfs as file system. One way to mitigate this bad performance is to tu

[Qemu-devel] [PATCH] qemu-img create: set nocow flag by default

2013-11-07 Thread Chunyan Liu
Set NOCOW flag to newly created images to solve performance issues on btrfs. Btrfs has terrible performance when hosting VM images, even more when the guest in those VM are also using btrfs as file system. One way to mitigate this bad performance is to turn off COW attributes on VM files (since ha