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Re: [win-pv-devel] XENNET,XENVIF and 128 vCPUs

Hi Eytan,


  That’s daring of you J


  The 8.1 PV drivers should all be processor group aware (which is what you need for anything more than 64 logical CPUs in Windows) but you’re pushing the boundaries of Xen’s HVM support there so I’m actually pleased to hear that you can even boot the guest at all! What version of Windows are you using?


  The network drivers are multi-queue aware and will attempt to create a queue for each vCPU. I don’t know what backend AWS uses but, if it is multi-queue aware and not limiting to a lower number of queues then I imagine it’s likely the guest is exceeding its xenstore quota. I suggest you try using the registry override in XENVIF to limit the number of queues the frontend tries to create: create a REG_DWORD called ‘FrontendMaxQueues’ under HKLM/System/CurrentControlSet/Services/XENVIF/Parameters and set it to something small-ish, e.g. 8.







From: win-pv-devel [mailto:win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Eytan Heidingsfeld
Sent: 20 November 2016 15:36
To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
Subject: [win-pv-devel] XENNET,XENVIF and 128 vCPUs


I'm trying to get 8.1 drivers to run on a 128 vCPU Amazon instance,
The machine boots OK, and I can see that windows loaded OK, but the networking doesn't work.

I'm planning on re-compiling the drivers in Debug and redirecting the DbgPrints to the Serial port (which is available on EC2), but before that wanted to ask if anyone has any direction to look into? Or any other info that should be collected as running these instances is very expensive.


Thanks in Advance,


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