Re: [Xen-devel] PV performance degraded after live migration

>>> On 16.03.17 at 09:13, wrote: > On Wed, Mar 15, Jan Beulich wrote: > >> ..., and iirc PV migration didn't have any issue with TSC freq >> changing during migration prior to the introduction of vTSC. > > When was this introduced? There is a claim that this slowdown is a >

Re: [Xen-devel] PV performance degraded after live migration

On Wed, Mar 15, Jan Beulich wrote: > ..., and iirc PV migration didn't have any issue with TSC freq > changing during migration prior to the introduction of vTSC. When was this introduced? There is a claim that this slowdown is a regression. Olaf signature.asc Description: PGP signature

Re: [Xen-devel] PV performance degraded after live migration

>>> On 15.03.17 at 17:41, wrote: > On 03/15/2017 12:02 PM, Jan Beulich wrote: > On 15.03.17 at 16:26, wrote: >>> On 15/03/17 15:23, Olaf Hering wrote: On Wed, Mar 15, Olaf Hering wrote: > On Wed, Mar 15, Andrew Cooper

Re: [Xen-devel] PV performance degraded after live migration

On 03/15/2017 12:02 PM, Jan Beulich wrote: On 15.03.17 at 16:26, wrote: >> On 15/03/17 15:23, Olaf Hering wrote: >>> On Wed, Mar 15, Olaf Hering wrote: >>> On Wed, Mar 15, Andrew Cooper wrote: > As a crazy idea, doest this help? > tsc->incarnation = 0

Re: [Xen-devel] PV performance degraded after live migration

>>> On 15.03.17 at 16:53, wrote: > On 15/03/17 16:43, Boris Ostrovsky wrote: >> On 03/15/2017 11:26 AM, Andrew Cooper wrote: >>> On 15/03/17 15:23, Olaf Hering wrote: On Wed, Mar 15, Olaf Hering wrote: > On Wed, Mar 15, Andrew Cooper wrote: >> As a crazy idea,

Re: [Xen-devel] PV performance degraded after live migration

>>> On 15.03.17 at 16:26, wrote: > On 15/03/17 15:23, Olaf Hering wrote: >> On Wed, Mar 15, Olaf Hering wrote: >> >>> On Wed, Mar 15, Andrew Cooper wrote: As a crazy idea, doest this help? tsc->incarnation = 0 >> This does indeed help. One system shows now the

Re: [Xen-devel] PV performance degraded after live migration

On Wed, Mar 15, 2017 at 09:53:02AM -0600, Jan Beulich wrote: > >>> On 15.03.17 at 16:43, wrote: ... > > We have seen something similar being caused by the superpage > > attribute getting dropped when the domU was migrated. The new > > copy of the domU only has 4K

Re: [Xen-devel] PV performance degraded after live migration

On 15/03/17 16:43, Boris Ostrovsky wrote: > On 03/15/2017 11:26 AM, Andrew Cooper wrote: >> On 15/03/17 15:23, Olaf Hering wrote: >>> On Wed, Mar 15, Olaf Hering wrote: >>> On Wed, Mar 15, Andrew Cooper wrote: > As a crazy idea, doest this help? > tsc->incarnation = 0 >>> This does

Re: [Xen-devel] PV performance degraded after live migration

>>> On 15.03.17 at 16:43, wrote: > On Wed, Mar 15, 2017 at 12:20:44PM +0100, Olaf Hering wrote: >> After reports about degraded performance after a PV domU was migrated >> from one dom0 to another it turned out that this issue happens with >> every version of Xen and

Re: [Xen-devel] PV performance degraded after live migration

On 15/03/17 15:43, Alan Robinson wrote: > Hi Olaf, > > On Wed, Mar 15, 2017 at 12:20:44PM +0100, Olaf Hering wrote: >> After reports about degraded performance after a PV domU was migrated >> from one dom0 to another it turned out that this issue happens with >> every version of Xen and every

Re: [Xen-devel] PV performance degraded after live migration

Hi Olaf, On Wed, Mar 15, 2017 at 12:20:44PM +0100, Olaf Hering wrote: > After reports about degraded performance after a PV domU was migrated > from one dom0 to another it turned out that this issue happens with > every version of Xen and every version of domU kernel. > > The used benchmark is

Re: [Xen-devel] PV performance degraded after live migration

On 03/15/2017 11:26 AM, Andrew Cooper wrote: > On 15/03/17 15:23, Olaf Hering wrote: >> On Wed, Mar 15, Olaf Hering wrote: >> >>> On Wed, Mar 15, Andrew Cooper wrote: As a crazy idea, doest this help? tsc->incarnation = 0 >> This does indeed help. One system shows now the results below,

Re: [Xen-devel] PV performance degraded after live migration

On 15/03/17 16:26, Andrew Cooper wrote: > On 15/03/17 15:23, Olaf Hering wrote: >> On Wed, Mar 15, Olaf Hering wrote: >> >>> On Wed, Mar 15, Andrew Cooper wrote: As a crazy idea, doest this help? tsc->incarnation = 0 >> This does indeed help. One system shows now the results below, which

Re: [Xen-devel] PV performance degraded after live migration

On 15/03/17 15:23, Olaf Hering wrote: > On Wed, Mar 15, Olaf Hering wrote: > >> On Wed, Mar 15, Andrew Cooper wrote: >>> As a crazy idea, doest this help? >>> tsc->incarnation = 0 > This does indeed help. One system shows now the results below, which > means the performance goes down during

Re: [Xen-devel] PV performance degraded after live migration

On Wed, Mar 15, Olaf Hering wrote: > On Wed, Mar 15, Andrew Cooper wrote: > > As a crazy idea, doest this help? > > tsc->incarnation = 0 This does indeed help. One system shows now the results below, which means the performance goes down during migration (to localhost) and goes back to normal

Re: [Xen-devel] PV performance degraded after live migration

On Wed, Mar 15, Andrew Cooper wrote: > As a crazy idea, doest this help? > tsc->incarnation = 0 Had to move to another testhost and this seems to help. Will do more testing once the original testsystems are accessible again. Thanks! Olaf signature.asc Description: PGP signature

Re: [Xen-devel] PV performance degraded after live migration

On 15/03/17 11:20, Olaf Hering wrote: > After reports about degraded performance after a PV domU was migrated > from one dom0 to another it turned out that this issue happens with > every version of Xen and every version of domU kernel. > > The used benchmark is 'sysbench memory'. I hacked it up

[Xen-devel] PV performance degraded after live migration

After reports about degraded performance after a PV domU was migrated from one dom0 to another it turned out that this issue happens with every version of Xen and every version of domU kernel. The used benchmark is 'sysbench memory'. I hacked it up to show how long the actual work takes, and that