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Date: Fri, 6 Nov 2009 02:17:34 +0000
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] [PATCH 0/4] net-bridge: rootless bridge support for
	qemu
Message-ID: <20091106021734.GL21630@shareable.org>
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To: Avi Kivity <avi@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>, Anthony Liguori <aliguori@us.ibm.com>, Arnd Bergmann <arndbergmann@googlemail.com>, Juan Quintela <quintela@redhat.com>, Dustin Kirkland <kirkland@canonical.com>, qemu-devel@nongnu.org, Michael Tsirkin <mst@redhat.com>

Avi Kivity wrote:
> On 11/05/2009 06:50 PM, Anthony Liguori wrote:
> >>I'm worrying that we're transforming one problem into two different 
> >>ones.  Expanding the scope of qemu, and making it more difficult to 
> >>use advanced networking functionality.
> >
> >
> >Do you object to the idea of having qemu call to a helper program 
> >directly or to the idea of having the helper program in qemu at all? 
> 
> Both, the former much less that the latter.
> 
> I dislike helper programs, I find them inefficient especially at runtime 
> as the penalties of fork() on a memory hog (esp. one that uses mmu 
> notifiers like qemu+kvm) are considerable.

Note that system() does not used fork() these days.  It should not be
affected by process size.

-- Jamie