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Re: [Qemu-devel] unix sockets for qemu


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] unix sockets for qemu
Date: Tue, 26 Feb 2013 17:31:04 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, Feb 25, 2013 at 07:02:30PM -0600, address@hidden wrote:
> The associated file contains a README that will guide you through the
> experiment that shows the difference between unix socket carried pings:
> 0.7ms and inet carried pings: 40ms!!!

There is no fundamental reason for inet sockets to have a 40 millisecond
round-trip time on localhost.  I remember from years ago that Solaris
"fuses" localhost inet sockets and bypasses TCP for them.

Adding a call to socket_set_nodelay() net/socket.c might help.

But I think there is something else broken here.

Please submit the UNIX domain sockets patch according to the guidelines
at http://wiki.qemu.org/Contribute/SubmitAPatch.

Stefan



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