Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Laszlo Ersek
On 06/26/17 22:30, Denis V. Lunev wrote: > 3. > > _zstd is multi-threaded, and it’s dangerous_ > > libzstd is single-threaded. > There is a multi-thread extension, which is enabled in the CLI, but not > in the library. > There is also an experimental target which makes it possible to produc

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Denis V. Lunev
On 06/26/2017 11:54 PM, Peter Lieven wrote: > >> Am 26.06.2017 um 22:30 schrieb Denis V. Lunev : >> >>> On 06/26/2017 11:28 AM, Kevin Wolf wrote: >>> [ Cc: qemu-devel; don't post to qemu-block only! ] >>> >>> Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: Hi, I am currently wor

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
> Am 26.06.2017 um 22:30 schrieb Denis V. Lunev : > >> On 06/26/2017 11:28 AM, Kevin Wolf wrote: >> [ Cc: qemu-devel; don't post to qemu-block only! ] >> >> Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: >>> Hi, >>> >>> I am currently working on optimizing speed for compressed QCOW2 >>>

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Denis V. Lunev
On 06/26/2017 11:28 AM, Kevin Wolf wrote: > [ Cc: qemu-devel; don't post to qemu-block only! ] > > Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: >> Hi, >> >> I am currently working on optimizing speed for compressed QCOW2 >> images. We use them for templates and would also like to use them f

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Richard W.M. Jones
On Mon, Jun 26, 2017 at 12:12:05PM +0100, Daniel P. Berrange wrote: > On Mon, Jun 26, 2017 at 10:28:38AM +0200, Kevin Wolf wrote: > > [ Cc: qemu-devel; don't post to qemu-block only! ] > > > > Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: > > > Hi, > > > > > > I am currently working on opt

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 13:21 schrieb Kevin Wolf: Am 26.06.2017 um 12:08 hat Peter Lieven geschrieben: Am 26.06.2017 um 11:57 schrieb Kevin Wolf: Am 26.06.2017 um 11:20 hat Peter Lieven geschrieben: So he chose a different algorithm (zstd). When I asked, he posted a comparison of algorithms (however

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Kevin Wolf
Am 26.06.2017 um 12:08 hat Peter Lieven geschrieben: > Am 26.06.2017 um 11:57 schrieb Kevin Wolf: > >Am 26.06.2017 um 11:20 hat Peter Lieven geschrieben: > >>>So he chose a different algorithm (zstd). When I asked, he posted a > >>>comparison of algorithms (however a generic one and not measured in

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Daniel P. Berrange
On Mon, Jun 26, 2017 at 10:28:38AM +0200, Kevin Wolf wrote: > [ Cc: qemu-devel; don't post to qemu-block only! ] > > Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: > > Hi, > > > > I am currently working on optimizing speed for compressed QCOW2 > > images. We use them for templates and would

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 12:16 schrieb Laszlo Ersek: On 06/26/17 11:33, Denis V. Lunev wrote: On 06/26/2017 12:20 PM, Peter Lieven wrote: Am 26.06.2017 um 10:28 schrieb Kevin Wolf: [ Cc: qemu-devel; don't post to qemu-block only! ] Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: Hi, I am curre

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Denis V. Lunev
On 06/26/2017 01:16 PM, Laszlo Ersek wrote: > On 06/26/17 11:33, Denis V. Lunev wrote: >> On 06/26/2017 12:20 PM, Peter Lieven wrote: >>> Am 26.06.2017 um 10:28 schrieb Kevin Wolf: [ Cc: qemu-devel; don't post to qemu-block only! ] Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben:

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 12:15 schrieb Denis V. Lunev: On 06/26/2017 01:04 PM, Daniel P. Berrange wrote: On Mon, Jun 26, 2017 at 11:20:33AM +0200, Peter Lieven wrote: Am 26.06.2017 um 10:28 schrieb Kevin Wolf: [ Cc: qemu-devel; don't post to qemu-block only! ] Am 26.06.2017 um 09:57 hat Peter Lieven

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 12:12 schrieb Daniel P. Berrange: On Mon, Jun 26, 2017 at 12:08:01PM +0200, Peter Lieven wrote: Am 26.06.2017 um 11:57 schrieb Kevin Wolf: Am 26.06.2017 um 11:20 hat Peter Lieven geschrieben: So he chose a different algorithm (zstd). When I asked, he posted a comparison of alg

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Laszlo Ersek
On 06/26/17 11:33, Denis V. Lunev wrote: > On 06/26/2017 12:20 PM, Peter Lieven wrote: >> >> Am 26.06.2017 um 10:28 schrieb Kevin Wolf: >>> [ Cc: qemu-devel; don't post to qemu-block only! ] >>> >>> Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: Hi, I am currently working on op

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Denis V. Lunev
On 06/26/2017 01:04 PM, Daniel P. Berrange wrote: > On Mon, Jun 26, 2017 at 11:20:33AM +0200, Peter Lieven wrote: >> Am 26.06.2017 um 10:28 schrieb Kevin Wolf: >>> [ Cc: qemu-devel; don't post to qemu-block only! ] >>> >>> Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: Hi, I am

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Daniel P. Berrange
On Mon, Jun 26, 2017 at 12:08:01PM +0200, Peter Lieven wrote: > Am 26.06.2017 um 11:57 schrieb Kevin Wolf: > > Am 26.06.2017 um 11:20 hat Peter Lieven geschrieben: > > > > So he chose a different algorithm (zstd). When I asked, he posted a > > > > comparison of algorithms (however a generic one and

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 11:57 schrieb Kevin Wolf: Am 26.06.2017 um 11:20 hat Peter Lieven geschrieben: So he chose a different algorithm (zstd). When I asked, he posted a comparison of algorithms (however a generic one and not measured in the context of qemu) that suggests that LZO would be slightly fa

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Daniel P. Berrange
On Mon, Jun 26, 2017 at 11:20:33AM +0200, Peter Lieven wrote: > > Am 26.06.2017 um 10:28 schrieb Kevin Wolf: > > [ Cc: qemu-devel; don't post to qemu-block only! ] > > > > Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: > > > Hi, > > > > > > I am currently working on optimizing speed for co

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Kevin Wolf
Am 26.06.2017 um 11:20 hat Peter Lieven geschrieben: > >So he chose a different algorithm (zstd). When I asked, he posted a > >comparison of algorithms (however a generic one and not measured in the > >context of qemu) that suggests that LZO would be slightly faster, but > >have a considerable wors

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 11:33 schrieb Denis V. Lunev: On 06/26/2017 12:20 PM, Peter Lieven wrote: Am 26.06.2017 um 10:28 schrieb Kevin Wolf: [ Cc: qemu-devel; don't post to qemu-block only! ] Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: Hi, I am currently working on optimizing speed for com

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Denis V. Lunev
On 06/26/2017 12:20 PM, Peter Lieven wrote: > > Am 26.06.2017 um 10:28 schrieb Kevin Wolf: >> [ Cc: qemu-devel; don't post to qemu-block only! ] >> >> Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: >>> Hi, >>> >>> I am currently working on optimizing speed for compressed QCOW2 >>> images. We

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Peter Lieven
Am 26.06.2017 um 10:28 schrieb Kevin Wolf: [ Cc: qemu-devel; don't post to qemu-block only! ] Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: Hi, I am currently working on optimizing speed for compressed QCOW2 images. We use them for templates and would also like to use them for backups,

Re: [Qemu-devel] QCOW2 support for LZO compression

2017-06-26 Thread Kevin Wolf
[ Cc: qemu-devel; don't post to qemu-block only! ] Am 26.06.2017 um 09:57 hat Peter Lieven geschrieben: > Hi, > > I am currently working on optimizing speed for compressed QCOW2 > images. We use them for templates and would also like to use them for > backups, but the latter is almost infeasible