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Re: [kvm-devel] [Qemu-devel] [PATCH 1/5] PCI DMA API (v3)
From: |
Blue Swirl |
Subject: |
Re: [kvm-devel] [Qemu-devel] [PATCH 1/5] PCI DMA API (v3) |
Date: |
Sun, 20 Apr 2008 09:42:18 +0300 |
On 4/19/08, Anthony Liguori <address@hidden> wrote:
> Blue Swirl wrote:
>
> > On 4/17/08, Anthony Liguori <address@hidden> wrote:
> >
> >
> > > Yes, the vector version of packet receive is tough. I'll take a look
> at
> > > your patch. Basically, you need to associate a set of RX vectors with
> each
> > > VLANClientState and then when it comes time to deliver a packet to the
> VLAN,
> > > before calling fd_read, see if there is an RX vector available for the
> > > client.
> > >
> > > In the case of tap, I want to optimize further and do the initial
> readv()
> > > to one of the clients RX buffers and then copy that RX buffer to the
> rest of
> > > the clients if necessary.
> > >
> > >
> >
> > The vector versions should also help SLIRP to add IP and Ethernet
> > headers to the incoming packets.
> >
> >
>
> Yeah, I'm hoping that with my posted linux-aio interface, I can add vector
> support since linux-aio has a proper asynchronous vector function.
>
> Are we happy with the DMA API? If so, we should commit it now so we can
> start adding proper vector interfaces for net/block.
Well, the IOVector part and bdrv_readv look OK, except for the heavy
mallocing involved.
I'm not so sure about the DMA side and how everything fits together
for zero-copy IO. For example, do we still need explicit translation
at some point?
- [Qemu-devel] [PATCH 5/5] virtio balloon driver (v3), (continued)
- [Qemu-devel] [PATCH 5/5] virtio balloon driver (v3), Anthony Liguori, 2008/04/15
- [Qemu-devel] [PATCH 2/5] virtio for QEMU (v3), Anthony Liguori, 2008/04/15
- [Qemu-devel] [PATCH 3/5] virtio network driver (v3), Anthony Liguori, 2008/04/15
- [Qemu-devel] [PATCH 4/5] virtio block driver (v3), Anthony Liguori, 2008/04/15
- Re: [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Blue Swirl, 2008/04/16
- Re: [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Anthony Liguori, 2008/04/16
- Re: [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Blue Swirl, 2008/04/17
- Re: [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Anthony Liguori, 2008/04/17
- Re: [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Blue Swirl, 2008/04/19
- Re: [kvm-devel] [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Anthony Liguori, 2008/04/19
- Re: [kvm-devel] [Qemu-devel] [PATCH 1/5] PCI DMA API (v3),
Blue Swirl <=
- Re: [kvm-devel] [Qemu-devel] [PATCH 1/5] PCI DMA API (v3), Anthony Liguori, 2008/04/20