From: Mike Dawson <mike.dawson@cloudapt.com>
To: Sahid Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>, kvm@vger.kernel.org
Subject: Re: virtio: Large number of tcp connections, vhost_net seems to be a bottleneck
Date: Sun, 20 Oct 2013 11:52:36 -0400 [thread overview]
Message-ID: <5263FC44.5060001@cloudapt.com> (raw)
In-Reply-To: <533233212.1710860.1382256273232.JavaMail.root@cloudwatt.com>
On 10/20/2013 4:04 AM, Sahid Ferdjaoui wrote:
> Hi all,
>
> I'm working on create a large number of tcp connections on a guest;
> The environment is on OpenStack:
>
> Host (dedicated compute node):
> OS/Kernel: Ubuntu/3.2
> Cpus: 24
> Mems: 128GB
>
> Guest (alone on the Host):
> OS/Kernel: Ubuntu/3.2
> Cpus: 4
> Mems: 32GB
>
> Currently a guest can handle about 700 000 established connections, the cpus are not loaded and 12giga of memory are used.
> I'm working to understand why I can go up...
>
> On my host, after several tests with different versions of openvswitch and with linux bridge,
> It look like the process vhost_net is the only process loaded to 100% and it seems vhost_net cannot use more than 1 cpu.
>
> I would like to get more informations about vhost_net and if there is a solution to configure it to use more than 1 cpu?
Not sure if it is relevant in your case, but the newly-released Open
vSwitch 2.0 is now multi-threaded:
http://openvswitch.org/releases/NEWS-2.0.0
@martin_casado said "This is a big deal. Multi-threading provides huge
performance benefits on flow setup"
https://twitter.com/martin_casado/status/390384030488616960
If you give it a try, let us know.
- Mike
>
> Thanks a lot,
> s.
> --
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next prev parent reply other threads:[~2013-10-20 15:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <7677902.1710678.1382256256542.JavaMail.root@cloudwatt.com>
2013-10-20 8:04 ` virtio: Large number of tcp connections, vhost_net seems to be a bottleneck Sahid Ferdjaoui
2013-10-20 15:52 ` Mike Dawson [this message]
2013-10-21 8:50 ` Sahid Ferdjaoui
2013-10-23 12:30 ` Jason Wang
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