Date: Wed, 20 Mar 2002 08:45:27 -0800 (PST) From: Patrick Thomas <root@utility.clubscholarship.com> To: <questions@freebsd.org> Subject: is there overhead in SMP machines related to SMP ? Message-ID: <20020320083947.M8701-100000@utility.clubscholarship.com>
next in thread | raw e-mail | index | archive | help
I have a quad-zeon 500. I loaded 4.5-RELEASE on it and there are perhaps 80-90 processes now running. `vmstat` output looks like: procs memory page disks faults cpu r b w avm fre flt re pi po fr sr aa0 md0 in sy cs us sy id 1 0 0 29056 329772 25 0 0 0 32 4 0 0 235 145 11 0 0 100 0 0 0 29056 329772 4 0 0 0 0 0 0 0 282 21 8 0 4 96 0 0 0 29056 329772 5 0 0 0 0 0 0 0 260 30 12 0 3 97 0 0 0 29056 329772 5 0 0 0 0 0 0 0 287 66 31 0 3 97 0 0 0 29056 329756 7 0 0 0 0 0 0 0 290 85 24 0 4 96 0 0 0 29056 329740 3 0 0 0 0 0 1 0 276 58 21 0 3 97 0 0 0 29056 329724 3 0 0 0 0 0 0 0 293 52 21 0 4 96 0 0 0 29056 329724 7 0 0 0 0 0 0 0 281 104 28 0 3 97 Note the 96-96% idle cpu. This seems very odd, since my laptop, and other single processor 4-500 mhz (pIII) systems are running many more processes, but their idle is between 98-99. However, when my laptop goes to 95-96, it is because "user" time goes up, but on my quad system it is hovering at 96-97 because "system" time is up. So should I assume that this is just an artifact of using SMP, and that whereas my laptop starts at 99-100 idle and goes down from there, this will just start at 96-97 idle and go down from there (but taking many more processes to drop me from 96 to 95 than it takes to drop my laptop from 99 to 98) ? Or is something else going on ? thanks! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020320083947.M8701-100000>