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Date: Tue, 22 Dec 2009 10:27:33 -0600 From: Anthony Liguori <anthony@...emonkey.ws> To: Andi Kleen <andi@...stfloor.org> CC: Gregory Haskins <gregory.haskins@...il.com>, Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>, kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, torvalds@...ux-foundation.org, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org, "alacrityvm-devel@...ts.sourceforge.net" <alacrityvm-devel@...ts.sourceforge.net> Subject: Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33 On 12/22/2009 10:21 AM, Andi Kleen wrote: >> So far, the only actual technical advantage I've seen is that vbus avoids >> EOI exits. >> > The technical advantage is that it's significantly faster today. > There are two separate pieces of code in question. There are front-end drivers and there are back-end drivers. Right now, there are only front-end drivers in the kernel today. The combination of vbus front-end drivers and *kernel* back-end drivers are faster than the *combination* of virtio front-end drivers and *userspace* back-end drivers. vhost-net is our kernel back-end driver. No one has yet established that the combination of virtio front-end driver and kernel back-end driver is really significantly slower than vbus. > Maybe your proposed alternative is as fast, or maybe it's not. Who knows? > > >> We think we understand why vbus does better than the current userspace >> virtio backend. That's why we're building vhost-net. It's not done yet, >> but our expectation is that it will do just as well if not better. >> > That's the vapourware vs working code disconnect I mentioned. One side has hard > numbers&working code and the other has expectations. I usually find it sad when the > vapourware holds up the working code. > We're not talking about vaporware. vhost-net exists. Regards, Anthony Liguori > -Andi > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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