similar to: [RFC V3 0/5] Multiqueue support for tap and virtio-net/vhost

Hello all: This seires is an update of last version of multiqueue support to add multiqueue capability to both tap and virtio-net. Some kinds of tap backends has (macvatp in linux) or would (tap) support multiqueue. In such kind of tap backend, each file descriptor of a tap is a qeueu and ioctls were prodived to attach an exist tap file descriptor to the tun/tap device. So the patch let qemu to

Hello all: This seires is an update of last version of multiqueue support to add multiqueue capability to both tap and virtio-net. Some kinds of tap backends has (macvatp in linux) or would (tap) support multiqueue. In such kind of tap backend, each file descriptor of a tap is a qeueu and ioctls were prodived to attach an exist tap file descriptor to the tun/tap device. So the patch let qemu to

From f244bcad756c4f761627557bb7f315b1d8f22fb2 Mon Sep 17 00:00:00 2001 From: Dor Laor <dor.laor@qumranet.com> Date: Thu, 20 Dec 2007 13:26:30 +0200 Subject: [PATCH] [VIRTIO-NET] Rx performance improvement The current performance are not good enough, the problem lies in qemu tap handling code that caused to pass packets one at a time and also to copy them to a temporal buffer. This patch

From f244bcad756c4f761627557bb7f315b1d8f22fb2 Mon Sep 17 00:00:00 2001 From: Dor Laor <dor.laor@qumranet.com> Date: Thu, 20 Dec 2007 13:26:30 +0200 Subject: [PATCH] [VIRTIO-NET] Rx performance improvement The current performance are not good enough, the problem lies in qemu tap handling code that caused to pass packets one at a time and also to copy them to a temporal buffer. This patch

This patch adds mergeable receive buffer support to qemu-kvm, to allow enabling it when vhost_net supports it. It also adds a missing call to vhost_net_ack_features() to push acked features to vhost_net. The patch is relative to Michael Tsirkin's qemu-kvm git tree. +-DLS Signed-off-by: David L Stevens <dlstevens at us.ibm.com> diff -ruNp qemu-kvm.mst/hw/vhost_net.c

This patch adds mergeable receive buffer support to qemu-kvm, to allow enabling it when vhost_net supports it. It also adds a missing call to vhost_net_ack_features() to push acked features to vhost_net. The patch is relative to Michael Tsirkin's qemu-kvm git tree. +-DLS Signed-off-by: David L Stevens <dlstevens at us.ibm.com> diff -ruNp qemu-kvm.mst/hw/vhost_net.c

This adds support for vhost-net virtio kernel backend. To enable (assuming device eth2): 1. enable promisc mode or program guest mac in device eth2 2. disable tso, gso, lro, jumbo frames on the card (disabling lro + jumbo frames should be sufficient, haven't tested this) 3. add vhost=eth2 to -net flag 4. run with CAP_NET_ADMIN priviledge (e.g. root) This patch is RFC, but works without

This adds support for vhost-net virtio kernel backend. To enable (assuming device eth2): 1. enable promisc mode or program guest mac in device eth2 2. disable tso, gso, lro, jumbo frames on the card (disabling lro + jumbo frames should be sufficient, haven't tested this) 3. add vhost=eth2 to -net flag 4. run with CAP_NET_ADMIN priviledge (e.g. root) This patch is RFC, but works without

From: Dmitry Fleytman <dfleytma at redhat.com> One of recently introduced Windows features (RSC) requires network driver to be able to enable and disable HW LRO offload on the fly without device reinitialization. Current Virtio specification doesn't support this requirement. The solution proposed by following spec patch is to add a new control command for this purpose. The same

From: Dmitry Fleytman <dfleytma at redhat.com> One of recently introduced Windows features (RSC) requires network driver to be able to enable and disable HW LRO offload on the fly without device reinitialization. Current Virtio specification doesn't support this requirement. The solution proposed by following spec patch is to add a new control command for this purpose. The same

From: Dmitry Fleytman <dfleytma at redhat.com> V3 changes: 1. Compat macro added 2. Feature name beautification V2 changes: 1. _GUEST_ added to command and feature names 2. Live migration logic fixed Reported-by: Michael S. Tsirkin <mst at redhat.com> One of recently introduced Windows features (RSC) requires network driver to be able to enable and disable HW LRO offload on

From: Dmitry Fleytman <dfleytma at redhat.com> V3 changes: 1. Compat macro added 2. Feature name beautification V2 changes: 1. _GUEST_ added to command and feature names 2. Live migration logic fixed Reported-by: Michael S. Tsirkin <mst at redhat.com> One of recently introduced Windows features (RSC) requires network driver to be able to enable and disable HW LRO offload on

From: Dmitry Fleytman <dfleytma at redhat.com> V2 changes: 1. _GUEST_ added to command and feature names 2. Live migration logic fixed Reported-by: Michael S. Tsirkin <mst at redhat.com> One of recently introduced Windows features (RSC) requires network driver to be able to enable and disable HW LRO offload on the fly without device reinitialization. Current Virtio

From: Dmitry Fleytman <dfleytma at redhat.com> V2 changes: 1. _GUEST_ added to command and feature names 2. Live migration logic fixed Reported-by: Michael S. Tsirkin <mst at redhat.com> One of recently introduced Windows features (RSC) requires network driver to be able to enable and disable HW LRO offload on the fly without device reinitialization. Current Virtio

From: Dmitry Fleytman <dfleytma at redhat.com> V4 changes: 1. Feature definitions re-used for command bitmask 2. Command data made uint64 3. Commit messsages fixed Reported-by: Rusty Russell rusty at rustcorp.com.au V3 changes: 1. Compat macro added 2. Feature name beautification V2 changes: 1. _GUEST_ added to command and feature names 2. Live migration logic fixed

From: Dmitry Fleytman <dfleytma at redhat.com> V4 changes: 1. Feature definitions re-used for command bitmask 2. Command data made uint64 3. Commit messsages fixed Reported-by: Rusty Russell rusty at rustcorp.com.au V3 changes: 1. Compat macro added 2. Feature name beautification V2 changes: 1. _GUEST_ added to command and feature names 2. Live migration logic fixed

OK, here's a patch that implements the virtio spec update that I sent earlier. It supercedes the PUBLISH_USED_IDX patches I sent out earlier. Support is added in both userspace and vhost-net. If you see issues or are just curious, you can turn the new feature off. For example: -global virtio-net-pci.event_idx=on -global virtio-blk-pci.event_idx=off Also, it's possible to try both

OK, here's a patch that implements the virtio spec update that I sent earlier. It supercedes the PUBLISH_USED_IDX patches I sent out earlier. Support is added in both userspace and vhost-net. If you see issues or are just curious, you can turn the new feature off. For example: -global virtio-net-pci.event_idx=on -global virtio-blk-pci.event_idx=off Also, it's possible to try both

This adds support for vhost-net virtio kernel backend. This patch is not intended to being merged yet. I'm posting it for the benefit of people testing the backend. Usage instructions: vhost currently requires MSI-X support in guest virtio. This means guests kernel version should be >= 2.6.31. To enable vhost, simply add ",vhost" flag to nic options. Example with tap backend:

This adds support for vhost-net virtio kernel backend. This patch is not intended to being merged yet. I'm posting it for the benefit of people testing the backend. Usage instructions: vhost currently requires MSI-X support in guest virtio. This means guests kernel version should be >= 2.6.31. To enable vhost, simply add ",vhost" flag to nic options. Example with tap backend: