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Re: [Qemu-devel] [question] virtio-net-device and multi-queue option
From: |
Eric Auger |
Subject: |
Re: [Qemu-devel] [question] virtio-net-device and multi-queue option |
Date: |
Fri, 19 Sep 2014 04:23:20 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
On 09/19/2014 03:42 AM, Gonglei (Arei) wrote:
>> Subject: [Qemu-devel] [question] virtio-net-device and multi-queue option
>>
>> Hi,
>>
>>
>> I am currently doing some benchmarks using virtio-net-device using
>> virtio-mmio (non PCI) with qemu_system_arm with KVM. Purpose is to
>> compare with device passthrough performance.
>>
>> I heard about the availability of a multi-queue option that greatly
>> improves the performance but I currently fail in enabling it.
>>
>> Please could someone explain me how to turn that feature on? My current
>> virtio-net options simply are:
>>
>> -netdev tap,id=tap0,ifname="tap0" \
>> -device virtio-net-device,netdev=tap0
>>
>
> There are some steps:
>
> 1. create multi-queue netdev device, such as tap device (you can
> use "ip tuntap" command, or libvirt), something like as below:
> ip tuntap add tap_1 mode tap multi_queue
> 2. pass corresponding parameters in QEMU command line:
> -netdev
> type=tap,ifname=tap_q,id=net1,vhost=on,vhostforce=on,queues=4,script= \
> -device virtio-net-device,netdev=net1,mq=on,vectors=9
Hi Gonglei,
Thanks for your quick reply.
Definitively I have not gone through step 1! Nethertheless I am a but
dubious about the fact the mq property does not seem to exist for my
virtio-net-device. I get
qemu-system-arm: -device
virtio-net-device,netdev=tap0,mq=on,mac=52:54:00:12:34:56: Property
'.mq' not found
Best Regards
Eric
>
>> Also are there any "easy" tunings I can play with to try to reach the
>> best performance.
>>
>
> You can consider that using irq binding, core binding, vhost-net? etc..
>
> Best regards,
> -Gonglei
>
>> Thank you in advance
>>
>> Best Regards
>>
>> Eric
>