Date: Sun, 2 Sep 2007 23:21:23 -0500 From: Doug Kelly <dougk@dougk-ff7.net> To: freebsd-current@freebsd.org Subject: Re: qemu on a recent -current, slow like a 486 ! Message-ID: <059F5A32-4979-422B-B42B-8163A151E874@dougk-ff7.net> In-Reply-To: <4956a5e50709022056o16fe85c8oab72532afe335b43@mail.gmail.com> References: <4956a5e50709022056o16fe85c8oab72532afe335b43@mail.gmail.com>
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On Sep 2, 2007, at 10:56 PM, Nenhum_de_Nos wrote: > hail, > > I have a Turion X2 1.8GHz and created a SMP 64bits VM just for running > folding at home. I'm now compiling linux kernel source for gentoo > distro, and it takes a century for each module (.o) to be compiled. > > FreeBSD xxx.apartnet 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Thu Aug 9 > 01:44:04 BRT 2007 root@xxx.apartnet:/usr/obj/usr/src/sys/xxx i386 > > and > > QEMU PC emulator version 0.9.0, Copyright (c) 2003-2007 Fabrice > Bellard > > any more info, just ask ... > > is it always this slow ?! Well, I know -CURRENT's kernel has a ton of debug options enabled by default, which will adversely impact performance. You can disable them in the kernel's config file (you'll need to rebuild the kernel, though), and the GENERIC config has some notes about them. Also, qemu is a full emulator--although there is a kernel module for Linux to allow some type of virtualization, I'm not sure if it's been ported to any other OSes. In short, yes, it will be slow. I'm sure "a century" is hyperbole, but yes, even though you are on a rather fast machine, it will be slow, as every single instruction on your qemu VM is going to be emulated. --Doug Kelly
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