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John Fastabend says: ==================== XDP adjust head support for virtio This series adds adjust head support for virtio. The following is my test setup. I use qemu + virtio as follows, ./x86_64-softmmu/qemu-system-x86_64 \ -hda /var/lib/libvirt/images/Fedora-test0.img \ -m 4096 -enable-kvm -smp 2 -netdev tap,id=hn0,queues=4,vhost=on \ -device virtio-net-pci,netdev=hn0,mq=on,guest_tso4=off,guest_tso6=off,guest_ecn=off,guest_ufo=off,vectors=9 In order to use XDP with virtio until LRO is supported TSO must be turned off in the host. The important fields in the above command line are the following, guest_tso4=off,guest_tso6=off,guest_ecn=off,guest_ufo=off Also note it is possible to conusme more queues than can be supported because when XDP is enabled for retransmit XDP attempts to use a queue per cpu. My standard queue count is 'queues=4'. After loading the VM I run the relevant XDP test programs in, ./sammples/bpf For this series I tested xdp1, xdp2, and xdp_tx_iptunnel. I usually test with iperf (-d option to get bidirectional traffic), ping, and pktgen. I also have a modified xdp1 that returns XDP_PASS on any packet to ensure the normal traffic path to the stack continues to work with XDP loaded. It would be great to automate this soon. At the moment I do it by hand which is starting to get tedious. v2: original series dropped trace points after merge. ==================== Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.