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Date: Tue, 14 Sep 2010 12:20:29 -0700 From: Shirley Ma <mashirle@...ibm.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: Arnd Bergmann <arnd@...db.de>, Avi Kivity <avi@...hat.com>, "Xin, Xiaohui" <xiaohui.xin@...el.com>, David Miller <davem@...emloft.net>, netdev@...r.kernel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel On Tue, 2010-09-14 at 21:01 +0200, Michael S. Tsirkin wrote: > On Tue, Sep 14, 2010 at 11:49:03AM -0700, Shirley Ma wrote: > > On Tue, 2010-09-14 at 20:27 +0200, Michael S. Tsirkin wrote: > > > As others said, the harder issues for TX are in determining that > it's > > > safe > > > to unpin the memory, and how much memory is it safe to pin to > beging > > > with. For RX we have some more complexity. > > > > I think unpin the memory is in kfree_skb() whenever the last > reference > > is gone for TX. What we discussed about here is when/how vhost get > > notified to update ring buffer descriptors. Do I misunderstand > something > > here? > > Right, that's a better way to put it. That's how this macvtap patch did. For how much pinned pages,it is limited by sk_wmem_alloc size in this patch. thanks Shirley -- 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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