linux-kernel - Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

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Message-ID: <20091222162110.GG10314@basil.fritz.box>
Date:	Tue, 22 Dec 2009 17:21:10 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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

> 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.

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.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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