Re: [Qemu-devel] RFC QCOW2 compression speed

2017-02-24 Thread Eric Blake
On 02/24/2017 01:54 PM, Peter Lieven wrote: > > Changing the compression level via environment or a QCOW2 parameter is not a > big deal. However, it helps not that much regarding speed. What helps is > increasing the window size, but this is an incompatible change. And if we go > for an incompa

Re: [Qemu-devel] RFC QCOW2 compression speed

2017-02-24 Thread Peter Lieven
> Am 24.02.2017 um 12:36 schrieb Laszlo Ersek : > > On 02/24/17 10:33, Peter Lieven wrote: >> Hi, >> >> >> i have been experimenting with deflate compression paramters in the past and >> found that the values chosen >> >> in QCOW2 are not that optimal. In fact creation of compressed QCOW2 is

Re: [Qemu-devel] RFC QCOW2 compression speed

2017-02-24 Thread Laszlo Ersek
On 02/24/17 10:33, Peter Lieven wrote: > Hi, > > > i have been experimenting with deflate compression paramters in the past and > found that the values chosen > > in QCOW2 are not that optimal. In fact creation of compressed QCOW2 is very > slow. I agree, I find it slow as well. > And especi

[Qemu-devel] RFC QCOW2 compression speed

2017-02-24 Thread Peter Lieven
Hi, i have been experimenting with deflate compression paramters in the past and found that the values chosen in QCOW2 are not that optimal. In fact creation of compressed QCOW2 is very slow. And especially for backups compression would be good, but its so slow thats almost infeasible to use.