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Date: Sat, 31 May 2014 02:37:56 +0200
From: Willem Jan Withagen <wjw@digiware.nl>
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To: Peter Grehan <grehan@freebsd.org>
Subject: Re: Bheve: Slow linux syscalls on AMD
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On 31-5-2014 2:13, Peter Grehan wrote:
> Hi Willem,
> 
>> So the question remains:
>>     Why is it taking so long on the AMD platform.
> 
>  The time difference looks a lot like a VM-exit roundtrip. My new AMD
> box is arriving shortly so I'll have a look into it.

Hi Peter,

I would expect something like this.
The question however what kind of business is done during the roundtrip.
Could it be something like a soft-interrupt 0x80 to get from userspace
to the kernel? Supossedly this interface is depreciated around 2.4

I'll see if I can augment the exit-code in bhyve.
Catching it with bhyvectl --get-all will probably have too much noise
from running the rest of the system.

--WjW