Re: [Xen-devel] serious performance regression in Xen 4.2.4 and 4.2.5

2015-02-19 Thread Andreas Kinzler
On 19.02.2015 12:20, Andrew Cooper wrote: Is it perhaps http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=f1e0df14412ccc6933a68eda66ac5b7d89186b62 There are a number of correctness fixes in that range which will adversely affect performance. I now reverted: http://xenbits.xen.org/gitwe

Re: [Xen-devel] serious performance regression in Xen 4.2.4 and 4.2.5

2015-02-19 Thread Malcolm Crossley
On 19/02/15 14:21, Jan Beulich wrote: On 19.02.15 at 14:08, wrote: >> On 19/02/15 11:08, Andreas Kinzler wrote: >>> Hello Xen developers, >>> >>> since we use Xen for our production systems, I run many tests on Xen >>> (stability/performance). One test now uncovered a serious performance >>>

Re: [Xen-devel] serious performance regression in Xen 4.2.4 and 4.2.5

2015-02-19 Thread Jan Beulich
>>> On 19.02.15 at 14:08, wrote: > On 19/02/15 11:08, Andreas Kinzler wrote: >> Hello Xen developers, >> >> since we use Xen for our production systems, I run many tests on Xen >> (stability/performance). One test now uncovered a serious performance >> regression when updating from Xen 4.2.3 to 4

Re: [Xen-devel] serious performance regression in Xen 4.2.4 and 4.2.5

2015-02-19 Thread Malcolm Crossley
On 19/02/15 11:08, Andreas Kinzler wrote: > Hello Xen developers, > > since we use Xen for our production systems, I run many tests on Xen > (stability/performance). One test now uncovered a serious performance > regression when updating from Xen 4.2.3 to 4.2.x (with x>=4). To > reproduce run a do

Re: [Xen-devel] serious performance regression in Xen 4.2.4 and 4.2.5

2015-02-19 Thread Andrew Cooper
On 19/02/15 11:08, Andreas Kinzler wrote: > Hello Xen developers, > > since we use Xen for our production systems, I run many tests on Xen > (stability/performance). One test now uncovered a serious performance > regression when updating from Xen 4.2.3 to 4.2.x (with x>=4). To > reproduce run a dom

[Xen-devel] serious performance regression in Xen 4.2.4 and 4.2.5

2015-02-19 Thread Andreas Kinzler
Hello Xen developers, since we use Xen for our production systems, I run many tests on Xen (stability/performance). One test now uncovered a serious performance regression when updating from Xen 4.2.3 to 4.2.x (with x>=4). To reproduce run a domU (HVM) and compile a kernel for example ("time m