-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Mon, 10 Nov 2003 22:26:41 +0200, Muli Ben-Yehuda <[EMAIL PROTECTED]> wrote: > > > i suspect that it might be the SMP support which is > > compiled into the kernel, mainly because when compiled with no SMP it runs > > just about fine, > > Uhm, when compiled with no smp, it runs with just one CPU.
I recently installed a dual Xeon 2.4 MH (with an old kernel 2.4.18). The single CPU kernel run MUCH, MUCH slower than the SMP one (applications took more than double the time it took with 2 CPUs). Hyper-threading can be enabled (the kernel sees 4 CPUs) or disabled (only 2 CPUs) by the bios. When enabled, the real saving of CPU intensive application (I used bash loop) is slight (about 20%). I found the Hyper-threading really useful when the the application mix has 2 or 3 CPU intensive processes (like gzip) and some or many I/O bound applications (the saving is greater than 30%). Ehud. - -- Ehud Karni Tel: +972-3-7966-561 /"\ Mivtach - Simon Fax: +972-3-7966-667 \ / ASCII Ribbon Campaign Insurance agencies (USA) voice mail and X Against HTML Mail http://www.mvs.co.il FAX: 1-815-5509341 / \ GnuPG: 98EA398D <http://www.keyserver.net/> Better Safe Than Sorry -----BEGIN PGP SIGNATURE----- Comment: use http://www.keyserver.net/ to get my key (and others) iD8DBQE/shjuLFvTvpjqOY0RAhKhAKCKenEMigVRcm912zAfg/yvUbs2qgCeMF67 G6gK46+Wq6CfY1XmYsxGnmc= =4fwS -----END PGP SIGNATURE----- ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
