-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sat, Jul 28, 2007 at 11:38:40AM -0700, Zachary Kline wrote: > I'm not too sure about the performance hit of using a VM vs > using a physical machine, but it doesn't seem that bad. New kernels compile > fine, anyways. Well, I can only speak from my own experience here obviously. This will of course depend on your hardware, as well as the vm software you use. I stand to be corrected here, but I think the main key here is how many instructions get executed by the physical cpu vs how many get emulated by the vm/how much code recompiling the vm needs to do on the fly to execute the modified code on the physical cpu. For example, I'm running virtualbox, and virtualpc on a 1.1GHz celeron, with 512Mb of physical ram. I've run both gnu/linux as a guest, as well as winxp temporarily for testing purposes. From my perspective, both run about the same under virtualbox, as they do on the host. In fact, the only way I can remember I'm in the guest, and not actually on the host, is that there is a very slight delay between pressing a key on the keyboard, and the action resulting in the key press. This delay of course doesn't exist on the physical machine, and is barely noticeable on the guest as it is. It's certainly not long enough to be annoying, although I guess it may be annoying just a bit if you're typing fast with key echo, and are sensitive to how fast you hear the character you just typed. My guess is that if I had something more modern, say a 2GHz dual-core system, this delay might not even exist, or at least not be noticeable. I also do find that when using gnu/linux as the guest, and espeak/speechd-up/speech-dispatcher for software speech, if I'm typing, or reading character by character, there is a slight barely perceptible echo of the last half-a-second of text spoken at the end. Since this doesn't however happen when running window-eyes under winxp as the guest, I think this may be due to how alsa/espeak/something else deals with the emulated sound hardware. On the other hand, when running virtualpc under the same physical hardware, the performance of the vm is noticeably slower, in my humble opinion, even if the guest additions are installed in a windows guest. My biggest issue overall running a vm on this system is the amount of ram I'm able to allocate to the guest, though this wouldn't be a problem most likely on a more modern system. Hth. Greg - -- web site: http://www.romuald.net.eu.org gpg public key: http://www.romuald.net.eu.org/pubkey.asc skype: gregn1 (authorization required, add me to your contacts list first) - -- Free domains: http://www.eu.org/ or mail dns-manager at EU.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFGq5kT7s9z/XlyUyARAvQ4AJ9oDpIkeN562pHwlGb/CdpUEiatogCgq3kE Km+o3u8kQSam294aXrXFto8= =yNbv -----END PGP SIGNATURE-----
