Date: Fri, 10 Jun 2011 14:30:55 -0600 From: "Justin T. Gibbs" <gibbs@FreeBSD.org> To: Colin Percival <cperciva@FreeBSD.org> Cc: "freebsd-xen@freebsd.org" <freebsd-xen@FreeBSD.org> Subject: Re: breakage in blkfront with ring_pages > 1 Message-ID: <4DF27EFF.5060005@FreeBSD.org> In-Reply-To: <4DF18EE5.5090704@freebsd.org> References: <4DF18EE5.5090704@freebsd.org>
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On 6/9/11 9:26 PM, Colin Percival wrote: > Hi all, > > I'm seeing breakage with ring_pages > 1 on a blkfront; more precisely, request > #32 has a garbage response (resulting in a panic) exactly as if the dom0 thinks > we're only using a single page for the ring. Forcing ring_pages to 1 makes the > problem go away. > > Has anyone seen anything like this? Is it possible that there's a bug in how > our blkfront negotiates the request ring? Does anyone have ring_pages > 1 in > use? The only backend driver I know of that can support more than one ring page is FreeBSD. So, the problem likely is that blkfront is getting the negotiation wrong and only 1 page is in use. -- Justin
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