Bheve: Slow linux syscalls on AMD
Willem Jan Withagen
wjw at digiware.nl
Sat May 31 00:37:58 UTC 2014
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.
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.
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