Category: Multiqueue virtio

PCIe SSDs on 8-socket servers, though even single and dual socket servers also benefit considerably from blk-mq. This article explains how blk-mq integrates into the Linux storage stack and which devices have blk-mq compatible drivers already included in the Linux kernel.

Blk-mq integrates seamlessly into the Linux storage stack. The tasks are distributed across multiple threads and therefore to multiple CPU cores per-core software queues.

Blk-mq compatible drivers inform blk-mq how many parallel hardware queues a device supports number of submission queues as part of the hardware dispatch queue registration. In his spare time he enjoys playing the piano and training for a good result at the annual Linz marathon relay. Views View View source History.

VirtIO 1.0: A Standard Emerges [balonarekade.pw 2014]

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multiqueue virtio

Sign in to your account. We are check the multi-queue capabilities of the virtio-net, found that enable mq on Windowsnetwork performance worse than the mq is disable. This is a bit unexpected, in the same test environment, CentOS 7. Contrast the CentOS test results, I think the bottleneck may be in the netkvm driver, we are continuing to investigate this issue, do you have any suggestions? Hi zyb. Thanks for reporting this, we are aware of NetKVM performance issues however the results that you are getting are very low and there are few thigns to do about that:.

What packet sizes are you using? Linux guest performs better than Windows is the expected result. However, it is surprising that sq is better than mq, whether it's happening on Windows or Linux guest. It is true that the editions of WS and the benchmark tool parameters affect the test result. Using essentials editions and iperf3, the result as bad as my first report.

enable multiqueue virtio nics

Using datacenter editions and iperf2, the result is better then the first time, and the mq is better than sq, just like linux guest. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. New issue. Jump to bottom. Copy link Quote reply. Hi, everyone, We are check the multi-queue capabilities of the virtio-net, found that enable mq on Windowsnetwork performance worse than the mq is disable; This is a bit unexpected, in the same test environment, CentOS 7. Thanks all. This comment has been minimized.

Sign in to view. Hi zybThanks for reporting this, we are aware of NetKVM performance issues however the results that you are getting are very low and there are few thigns to do about that: Try and use iperf2 instead of iperf3, for some reason iperf3 gives very poor performance on Windows. Try and use iperf2 instead of iperf3, for some reason iperf3 gives very poor performance on Windows. Sure, we give the same vcpus as the queues num to vm is vhost on? As far as we know iperf3 is not built for multi-stream benchmarking.

Add multiple queue support for net device Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. Linked pull requests.

You signed in with another tab or window.That means that all packets between the Internet and all the instances of the region need to pass through the node. So we stayed with our inefficient but simple configuration that has worked very reliably for us so far.

But when running e. So we started looking for a way to distribute the work over several cores. These interfaces can be configured to expose multiple queues. Here is an example of an interface definition in libvirt XML syntax which has been configured for eight queues:.

A good rule of thumb is to set the number of queues to the number of virtual CPU cores of the system. Within the VM, kernel threads need to be allocated to the interface queues. This can be achieved using ethtool -L:. Much of the packet forwarding on the network node is performed by OVS. Our systems normally run Ubuntu The current Ubuntu Unfortunately we cannot upgrade to Ubuntu And after a reboot, the network node should be running a fresh Linux 4. The network node VM is set up with 8 vCPUs, and the two interfaces that carry traffic are configured with 8 queues each.

And traffic between the network node and the hypervisors is sent encapsulated in VXLAN, which has some overhead. But stay tuned! Multithreading to the Rescue!

multiqueue virtio

Multi-threaded forwarding in the network node VM Within the VM, kernel threads need to be allocated to the interface queues. Network node running 3. Network node running 4.Will use testpmd as the test application. This case is to check if the virtio-pmd can work well when queue number dynamic change. In this case, set both vhost-pmd and virtio-pmd max queue number as 2 queues.

Launch vhost-pmd with 2 queues. Launch virtio-pmd with 1 queue first then in testpmd, change the number to 2 queues. Expect no crash happened. There should be no core dump or unexpected crash happened during the queue number changes. This case is to check if the vhost-pmd queue number dynamic change can work well. In this case, set vhost-pmd and virtio-pmd max queue number as 2.

Launch vhost-pmd with 1 queue first then in testpmd, change the queue number to 2 queues. At virtio-pmd side, launch it with 2 queues.

Port Blacklist Tests 3. Cloud filter Support through Ethtool Tests 5. Coremask Tests 6. Cryptodev Performance Application Tests Dynamic Driver Configuration Tests Dynamic queue External Tag E-tag Tests Ability to use external memory test plan External Mempool Handler Tests Niantic Flow Director Tests Flow classification for softnic PMD Generic Filter Tests Hotplug on multi-processes Niantic Inline IPsec Tests One-shot Rx Interrupt Tests Requirements and Setup for Multiqueue Virtio Interfaces.

OpenStack Liberty supports the ability to create VMs with multiple queues on their virtio interfaces. Multiqueue virtio is an approach that enables the processing of packet sending and receiving to be scaled to the number of available virtual CPUs vCPUs of a guest, through the use of multiple queues.

The maximum number of queues in the VM interface is set to the same value as the number of vCPUs in the guest.

Does virtio-net multiqueue use all queues by default?

After the VM is spawned, use the following command on the virtio interface in the guest to enable multiple queues inside the VM:. Packets will now be forwarded on all queues in the VM to and from the vRouter running on the host. Contrail 3. The DPDK vrouter has the same setup requirements as the kernel mode vrouter. However, in the ethtool —L setup command, the number of queues cannot be higher than the number of CPU cores assigned to vrouter in the testbed file. Help us improve your experience.

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But if I try to set a ethtool rule I get this error:. In my opinion it doesn't really make sense to enable multiqueue without flow steering because otherwise it is not possible to do performant load distribution on multiple CPUs. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. Ask Question. Asked today. Active today. Viewed 5 times. This means I am basically able to tell the NIC where I want specific packets to arrive, such as ethtool -N eth1 flow-type udp4 dst-ip But if I try to set a ethtool rule I get this error: rxclass: Cannot get RX class rule count: Operation not supported In my opinion it doesn't really make sense to enable multiqueue without flow steering because otherwise it is not possible to do performant load distribution on multiple CPUs.

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In this case, set both vhost-pmd and virtio-pmd max queue number as 2 queues. Launch vhost-pmd with 2 queues. Launch virtio-pmd with 1 queue first then in testpmd, change the number to 2 queues.

Expect no crash happened.

There should be no core dump or unexpected crash happened during the queue number changes. This case is to check if the vhost-pmd queue number dynamic change can work well. In this case, set vhost-pmd and virtio-pmd max queue number as 2. Launch vhost-pmd with 1 queue first then in testpmd, change the queue number to 2 queues. At virtio-pmd side, launch it with 2 queues. Port Blacklist Tests 2.

multiqueue virtio

Cloud filter Support through Ethtool Tests 4. Coremask Tests 5. Cryptodev Performance Application Tests 6. Dynamic Driver Configuration Tests 9. External Tag E-tag Tests External Mempool Handler Tests Niantic Flow Director Tests Generic Filter Tests One-shot Rx Interrupt Tests

multiqueue virtio