Re: [Qemu-devel] qemu 1.1.0 slow as hell booting ?

[Luigi Rizzo]

On Thu, Jul 19, 2012 at 04:43:05PM +0200, Luigi Rizzo wrote:
> hi,
> while playing with various qemu versions i noticed that
> qemu-devel now in FreeBSD ports (1.1.0) is slow as hell when
> booting FreeBSD (take for instance the netmap image at
> 
> http://info.iet.unipi.it/~luigi/netmap/20120608-netmap-picobsd-head-amd64.bin
> 
> while 0.11.x and 1.1.1 and 1.0.1 seem to work well.
> 
> I should mention that i had the same exact problem a few months
> ago with a qemu version compiled on my Mac using macports,
> which was fixed by manually building one myself from the sources
> (the working Mac version reports version 1.0.91; unfortunately
> i do not remember which version it was, but judging from the
> macports history it could have been either 0.14.1 or 1.0)
> so i do not think this is a specific problem with FreeBSD.
> 
> Are you able to reproduce this problem ?  Any idea on what could it be ?

Just for the archives:

the problem was that the FreeBSD port, when compiling with CLANG,
used --enable-tcg-interpreter which caused the slow code to be
generated. I suppose the same problem existed in the macports version

cheers
luigi

> cheers
> luigi