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Re: [Xen-devel] AW: Load increase after memory upgrade?

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] AW: Load increase after memory upgrade?
From: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Date: Mon, 27 Jun 2011 17:37:14 +0200
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Carsten Schiers <carsten@xxxxxxxxxx>
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Hello Konrad,

Monday, June 27, 2011, 3:46:43 PM, you wrote:

> On Mon, Jun 27, 2011 at 01:29:24PM +0200, Carsten Schiers wrote:
>> Hi,
>> the higher load is neither bound to memory increase nor Xen version, it's 
>> the kernel. 
>> Changed at the same time from a Xenified kernel to pvops jeremy's 
>> git
>> stable-2.6.32.x
>> Konrad, are you interested? You can see from attached graphic the much higer 
>> load
>> mid 21 to 24. riker (yellow) is using the cards constantly for scanning 
>> transponders,
>> two seem to make use of DMA for that reason...

> Um, so 2.6.34 to 2.6.32 causes this spike in usage? What is the SWIOTLB 
> (PCI-DMA32)
> usage between these two kernels and are the drivers (budget_...) the same 
> version?

is it actually the drivers that are consuming more cpu ?
2.6.32.x series still seem to show higher cpu utilazation and more wake-ups due 
to some console issue resulting in high events/0 in dom0.
That seems to be over in the new linux 3.0 kernels


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