Date: Mon, 03 Sep 2007 06:22:38 +0100 From: Bruce Cran <bruce@cran.org.uk> To: Doug Kelly <dougk@dougk-ff7.net> Cc: freebsd-current@freebsd.org Subject: Re: qemu on a recent -current, slow like a 486 ! Message-ID: <46DB9A1E.4080000@cran.org.uk> In-Reply-To: <059F5A32-4979-422B-B42B-8163A151E874@dougk-ff7.net> References: <4956a5e50709022056o16fe85c8oab72532afe335b43@mail.gmail.com> <059F5A32-4979-422B-B42B-8163A151E874@dougk-ff7.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Doug Kelly wrote: > 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. The kernel module to speed up execution of the x86 emulation on x86 platforms is available in the emulators/kqemu-kmod port. -- Bruce Cran
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?46DB9A1E.4080000>