From: "Michael S. Tsirkin" <mst@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: virtualization@lists.linux-foundation.org
Subject: Re: [PATCH 12/22] virtio_pci: allow duplicate capabilities.
Date: Thu, 21 Mar 2013 19:13:19 +0200 [thread overview]
Message-ID: <20130321171319.GD2994@redhat.com> (raw)
In-Reply-To: <514B3EAE.8000707@zytor.com>
On Thu, Mar 21, 2013 at 10:09:02AM -0700, H. Peter Anvin wrote:
> On 03/21/2013 10:07 AM, Michael S. Tsirkin wrote:
> >
> > I just think it does not apply to BIOS so much. A bigger issue for BIOS
> > virtio performance is that it normally does not implement batching at
> > all, to keep it simple and reduce memory usage it uses a small number
> > (often 1) of outstanding buffers per queue.
> >
>
> You asked for examples, so I gave one. There is no doubt that BIOS can
> make use of this if available.
>
> What you describe above is of course a typical problem with BIOS.
>
> -hpa
Right, thanks.
Also thanks for the spec quote, I really think we should add the config
cycle access as a guaranteed feature. It's easy and I expect all BIOS
drivers to use it.
--
MST
next prev parent reply other threads:[~2013-03-21 17:13 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-21 8:29 [PATCH 00/22] New virtio PCI layout Rusty Russell
2013-03-21 8:29 ` [PATCH 01/22] virtio_config: introduce size-based accessors Rusty Russell
2013-03-21 8:29 ` [PATCH 02/22] virtio_config: use " Rusty Russell
2013-03-21 8:29 ` [PATCH 03/22] virtio_config: make transports implement accessors Rusty Russell
2013-03-21 9:09 ` Cornelia Huck
2013-03-22 0:31 ` Rusty Russell
2013-03-22 9:13 ` Cornelia Huck
2013-03-22 14:43 ` Sjur Brændeland
2013-03-24 4:24 ` Rusty Russell
2013-04-03 15:58 ` Sjur Brændeland
2013-04-02 17:16 ` Pawel Moll
2013-03-21 8:29 ` [PATCH 04/22] virtio: use u32, not bitmap for struct virtio_device's features Rusty Russell
2013-03-21 10:00 ` Cornelia Huck
2013-03-22 0:48 ` Rusty Russell
2013-03-21 8:29 ` [PATCH 05/22] virtio: add support for 64 bit features Rusty Russell
2013-03-21 10:06 ` Cornelia Huck
2013-03-22 0:50 ` Rusty Russell
2013-03-22 9:15 ` Cornelia Huck
2013-03-22 14:50 ` Sjur Brændeland
2013-03-22 20:12 ` Ohad Ben-Cohen
2013-03-25 8:30 ` Rusty Russell
2013-04-02 17:09 ` Pawel Moll
2013-03-21 8:29 ` [PATCH 06/22] virtio: move vring structure into struct virtqueue Rusty Russell
2013-03-21 8:29 ` [PATCH 07/22] pci: add pci_iomap_range Rusty Russell
2013-03-21 8:29 ` [PATCH 08/22] virtio-pci: define layout for virtio vendor-specific capabilities Rusty Russell
2013-03-21 8:29 ` [PATCH 09/22] virtio_pci: move old defines to legacy, introduce new structure Rusty Russell
2013-03-21 8:29 ` [PATCH 10/22] virtio_pci: use _LEGACY_ defines in virtio_pci_legacy.c Rusty Russell
2013-03-21 8:29 ` [PATCH 11/22] virtio_pci: don't use the legacy driver if we find the new PCI capabilities Rusty Russell
2013-03-21 8:29 ` [PATCH 12/22] virtio_pci: allow duplicate capabilities Rusty Russell
2013-03-21 10:28 ` Michael S. Tsirkin
2013-03-21 14:26 ` H. Peter Anvin
2013-03-21 14:43 ` Michael S. Tsirkin
2013-03-21 14:45 ` H. Peter Anvin
2013-03-21 15:19 ` Michael S. Tsirkin
2013-03-21 15:26 ` H. Peter Anvin
2013-03-21 15:58 ` Michael S. Tsirkin
2013-03-21 16:04 ` H. Peter Anvin
2013-03-21 16:11 ` Michael S. Tsirkin
2013-03-21 16:15 ` H. Peter Anvin
2013-03-21 16:26 ` Michael S. Tsirkin
2013-03-21 16:32 ` H. Peter Anvin
2013-03-21 17:07 ` Michael S. Tsirkin
2013-03-21 17:09 ` H. Peter Anvin
2013-03-21 17:13 ` Michael S. Tsirkin [this message]
2013-03-21 17:49 ` Michael S. Tsirkin
2013-03-21 17:54 ` H. Peter Anvin
2013-03-21 18:01 ` Michael S. Tsirkin
2013-03-22 0:57 ` Rusty Russell
2013-03-22 3:17 ` H. Peter Anvin
2013-03-24 13:14 ` Michael S. Tsirkin
2013-03-24 23:23 ` H. Peter Anvin
2013-03-25 6:53 ` Michael S. Tsirkin
2013-03-25 6:54 ` H. Peter Anvin
2013-03-25 10:03 ` Rusty Russell
2013-03-21 8:29 ` [PATCH 13/22] virtio_pci: new, capability-aware driver Rusty Russell
2013-03-21 10:24 ` Michael S. Tsirkin
2013-03-22 1:02 ` Rusty Russell
2013-03-24 13:08 ` Michael S. Tsirkin
2013-03-21 8:29 ` [PATCH 14/22] virtio_pci: layout changes as per hpa's suggestions Rusty Russell
2013-03-21 8:29 ` [PATCH 15/22] virtio_pci: use little endian for config space Rusty Russell
2013-03-21 8:29 ` [PATCH 16/22] virtio_pci: use separate notification offsets for each vq Rusty Russell
2013-03-21 10:13 ` Michael S. Tsirkin
2013-03-21 10:35 ` Michael S. Tsirkin
2013-03-22 2:52 ` Rusty Russell
2013-03-24 14:38 ` Michael S. Tsirkin
2013-03-24 20:19 ` Michael S. Tsirkin
2013-03-24 23:27 ` H. Peter Anvin
2013-03-25 7:05 ` Michael S. Tsirkin
2013-03-25 10:00 ` Rusty Russell
2013-03-26 19:39 ` Michael S. Tsirkin
2013-03-27 0:07 ` Rusty Russell
2013-03-27 0:22 ` H. Peter Anvin
2013-03-27 2:31 ` H. Peter Anvin
2013-03-27 11:26 ` Michael S. Tsirkin
2013-03-27 14:21 ` H. Peter Anvin
2013-03-27 11:25 ` Michael S. Tsirkin
2013-03-28 4:50 ` H. Peter Anvin
2013-03-30 3:19 ` Rusty Russell
2013-04-02 22:51 ` H. Peter Anvin
2013-04-03 6:10 ` Rusty Russell
2013-04-03 11:22 ` Michael S. Tsirkin
2013-04-03 14:10 ` H. Peter Anvin
2013-04-03 14:35 ` Michael S. Tsirkin
2013-04-03 14:35 ` H. Peter Anvin
2013-04-03 17:02 ` Michael S. Tsirkin
2013-04-04 5:48 ` Rusty Russell
2013-04-04 8:25 ` Michael S. Tsirkin
2013-04-05 1:25 ` Rusty Russell
2013-03-21 8:29 ` [PATCH 17/22] virtio_pci_legacy: cleanup struct virtio_pci_vq_info Rusty Russell
2013-03-21 8:29 ` [PATCH 18/22] virtio_pci: share structure between legacy and modern Rusty Russell
2013-03-21 8:29 ` [PATCH 19/22] virtio_pci: share interrupt/notify handlers " Rusty Russell
2013-03-21 8:29 ` [PATCH 20/22] virtio_pci: share virtqueue setup/teardown between modern and legacy driver Rusty Russell
2013-03-21 8:29 ` [PATCH 21/22] virtio_pci: simplify common helpers Rusty Russell
2013-03-21 8:29 ` [PATCH 22/22] virtio_pci: fix finalize_features in modern driver Rusty Russell
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