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Re: [Qemu-devel] Threaded VNC server status - time to enable by default

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] Threaded VNC server status - time to enable by default ?
Date: Wed, 20 Jun 2012 14:03:22 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Wed, Jun 20, 2012 at 07:58:53AM -0500, Anthony Liguori wrote:
> On 06/20/2012 04:15 AM, Daniel P. Berrange wrote:
> >We recently had a request in Fedora to enable the VNC server thread
> >support in our builds of QEMU. There have been periodic messages on
> >this list that suggest the threaded VNC server has better performance
> >and less latency.
> >
> >My view though, is that there must be some good reason why QEMU does
> >not enable it by default already. Can anyone say why QEMU has not
> >enabled the VNC server threads by default ?
> >
> >If there is no such reason, can we just kill the configure options
> >--{disable,enable}-vnc-thread, and have everyone use the VNC server
> >thread support forever more. I struggle to see the point in maintaining
> >these two separate codepaths for the VNC server. Whichever one is
> >not the default is, IMHO, destined to bitrot through lack of widespread
> >testing and so we're better off getting everyone to use&  test the
> >same codepath.
> At the time it was introduced, QEMU still has no hard requirement on
> having pthreads as a dependency (the I/O thread was still optional).
> We're past that point now so there's no harm in unconditionally
> enabling the VNC thread pool.

Ok, I'll post a patch to that effect.

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