From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: [RFC 7/11] virtio_pci: new, capability-aware driver. Date: Thu, 12 Jan 2012 18:03:18 +1100 Message-ID: <1326351798.23910.211.camel@pasglop> References: <871us0om2t.fsf@rustcorp.com.au> <20111220113718.GF3913@redhat.com> <878vm6daqy.fsf@rustcorp.com.au> <20120110170334.GA18404@redhat.com> <8762gj6q5r.fsf@rustcorp.com.au> <20120111102129.GC20988@redhat.com> <87vcoh4r2y.fsf@rustcorp.com.au> <1326342719.23910.199.camel@pasglop> <20120112060954.GD10319@redhat.com> <1326349714.23910.207.camel@pasglop> <20120112065132.GF10319@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120112065132.GF10319@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: "Michael S. Tsirkin" Cc: Christian Borntraeger , Sasha Levin , Pawel Moll , virtualization List-Id: virtualization@lists.linuxfoundation.org On Thu, 2012-01-12 at 08:51 +0200, Michael S. Tsirkin wrote: > One othe rinteresting thing is that > in practice host often runs on the same CPU as guest. That's surprising. On Power with our huge exit cost, I would think that would hurt more than anything else. > This is the fastest way to run the host for when it > does not do a lot of work as most data is cached. And there amount of sharing > is less important than reducing cache consumption. > > Again this is different from real hardware. Yes indeed. Cheers, Ben.