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

[Andreas Kinzler <ml-ak@xxxxxxxxx>]

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/gitweb/?p=xen.git;a=commit;h=f1e0df14412ccc6933a68eda66ac5b7d89186b62
  
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=644e6c5c7106d276fb750daf6e07de0034b2e76a
  
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=0fffcffeb594741d5027c8c0d05900b951f997b2
and benchmark times improve but are no longer reproducable (either 3:36 or 5:09 
instead of 6:xx with untouched 4.2.4).

Xen 4.3.3/4.4.1/4.5.0 have performance nearly identical to 4.2.3.

System:
  Mainboard Supermicro X9SCM-F, BIOS 2.1
  Adaptec 5405, one Raid 0
  Xeon E3-1230
  16 GB ECC non-registered
  dom0 kernel is mostly vanilla 3.10.44
  VT-d is turned off in the BIOS

"linux compile" HVM has 2 vCPUs and 2000 MB RAM

Regards Andreas


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