Date: Sat, 31 May 2014 02:37:56 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: Peter Grehan <grehan@freebsd.org> Cc: freebsd-virtualization@freebsd.org Subject: Re: Bheve: Slow linux syscalls on AMD Message-ID: <53892464.50005@digiware.nl> In-Reply-To: <53891EAA.8040105@freebsd.org> References: <5388B56D.1000501@digiware.nl> <20140530212900.6B74B6BF@hub.freebsd.org> <53891BC1.9050701@digiware.nl> <53891EAA.8040105@freebsd.org>
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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
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