Re: Bheve: Slow linux syscalls on AMD

2014-05-30 Thread Nils Beyer
Hi Willem, Willem Jan Withagen wrote: 1) I'm looking for a better basic syscall in Linux that is not cache, faked or otherwise tweaked to nog give what I want. Would really be nice if there was a NOP_syscall, just go in and out of kernel space. Hmm, I've tried your test with getuid.

Re: Bheve: Slow linux syscalls on AMD

2014-05-30 Thread Peter Grehan
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. later, Peter. ___

Re: Bheve: Slow linux syscalls on AMD

2014-05-30 Thread Willem Jan Withagen
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

Re: Bheve: Slow linux syscalls on AMD

2014-05-30 Thread Willem Jan Withagen
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. Before running the getuid test: vm exits