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From: Sahid Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>
To: kvm@vger.kernel.org
Subject: virtio: Large number of tcp connections, vhost_net seems to be a bottleneck
Date: Sun, 20 Oct 2013 08:04:33 +0000 (UTC)	[thread overview]
Message-ID: <533233212.1710860.1382256273232.JavaMail.root@cloudwatt.com> (raw)
In-Reply-To: <7677902.1710678.1382256256542.JavaMail.root@cloudwatt.com>

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?

Thanks a lot,
s.

       reply	other threads:[~2013-10-20  8:13 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 ` Sahid Ferdjaoui [this message]
2013-10-20 15:52   ` virtio: Large number of tcp connections, vhost_net seems to be a bottleneck Mike Dawson
2013-10-21  8:50     ` Sahid Ferdjaoui
2013-10-23 12:30   ` Jason Wang

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