Re: [Xen-devel] Noticeably poor Intel GPU performance on 3.3 and 3.4 dom0 kernels

[Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On 30.05.2012 16:28, Konrad Rzeszutek Wilk wrote:
> On Wed, May 30, 2012 at 12:14:07PM +0200, Joanna Rutkowska wrote:
>> Hello,
>>
>> I've recently been some newer Dom0 kernels (3.3.5, 3.4) under Xen 4.1.2,
>> and have noticed that those kernel noticeably downgrade performance of
>> (at least) Intel GPUs. This is easily noticeable even on such trivial
>> tasks as scrolling a webpage in Firefox or Chrome. This slow GPU
>> performance on 3.3 and 3.4 kernels is in stark contrast with what I see
>> on 3.2.7 Dom0 kernel, where graphics works just great...
>>
>> In order to make sure that this is not caused by power management set
>> too strictly, I played with xenpm and made sure to set the following:
> 
> And are you building with CONFIG_INTEL_IOMMU=y?

Yes:
CONFIG_GART_IOMMU=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
(...)
CONFIG_IOMMU_API=y
CONFIG_IOMMU_SUPPORT=y
CONFIG_AMD_IOMMU=y
# CONFIG_AMD_IOMMU_STATS is not set
CONFIG_AMD_IOMMU_V2=m
CONFIG_DMAR_TABLE=y
CONFIG_INTEL_IOMMU=y
CONFIG_INTEL_IOMMU_DEFAULT_ON=y
CONFIG_INTEL_IOMMU_FLOPPY_WA=y
CONFIG_IRQ_REMAP=y

> 
>> 1) xenpm set-scaling-governor performance
>> 2) xenpm set-max-cstate 0
>>
>> I have verified then that my processor: 1) keeps staying in P0 state
>> (so, max frequency), and 2) keeps staying in C0 state.
>>
>> Those setting didn't change anything regarding the poor graphics
>> performance, though.
>>
>> Any ideas what else I could test to find out the cause of this?
>>
>> Thanks,
>> joanna.
>>
> 
> 
> 
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-devel
> 


-- 
Best Regards / Pozdrawiam,
Marek Marczykowski
Invisible Things Lab

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