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Date: Sun, 04 Dec 2011 18:33:52 +0200 From: Avi Kivity <avi@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> CC: Sasha Levin <levinsasha928@...il.com>, Rusty Russell <rusty@...tcorp.com.au>, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org, markmc@...hat.com Subject: Re: [PATCH] virtio-ring: Use threshold for switching to indirect descriptors On 12/04/2011 06:00 PM, Michael S. Tsirkin wrote: > > If you > > copy descriptors, then it goes away. > > The avail ring could go away. used could if we make descriptors > writeable. IIUC it was made RO in the hope that will make it > easier for xen to adopt. Still relevant? You mean RO from the consumer side? Why can't Xen do that? > > That does suck. Are there issues in increasing the ring size? Or > > making it discontiguous? > > discontiguous ring is what indirect is, basically. No, discontiguous is more cache and prefetch friendly. With vmap(), the code doesn't even change. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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