53 messages in org.freebsd.freebsd-currentRe: Download of FreeBSD 3.0-SNAP | From | Sent On | Attachments |
|---|---|---|
| Daniel Hawton | Sep 12, 1998 10:59 pm | |
| Tom | Sep 13, 1998 12:17 am | |
| Gary Palmer | Sep 13, 1998 1:16 am | |
| Joel Ray Holveck | Sep 13, 1998 8:14 am | |
| Tom | Sep 13, 1998 10:16 am | |
| Chuck Robey | Sep 13, 1998 10:18 am | |
| Stefan Eggers | Sep 13, 1998 11:26 am | |
| Gary Palmer | Sep 13, 1998 12:57 pm | |
| Terry Lambert | Sep 13, 1998 4:43 pm | |
| David Greenman | Sep 13, 1998 9:11 pm | |
| Dan Strick | Sep 14, 1998 2:16 am | |
| David Greenman | Sep 14, 1998 10:21 am | |
| Joel Ray Holveck | Sep 14, 1998 10:38 am | |
| Terry Lambert | Sep 14, 1998 11:07 am | |
| Terry Lambert | Sep 14, 1998 11:11 am | |
| Terry Lambert | Sep 14, 1998 2:55 pm | |
| Joel Ray Holveck | Sep 14, 1998 3:29 pm | |
| Mike Smith | Sep 14, 1998 4:51 pm | |
| David Greenman | Sep 14, 1998 5:22 pm | |
| David O'Brien | Sep 14, 1998 6:19 pm | |
| Terry Lambert | Sep 14, 1998 6:55 pm | |
| David Greenman | Sep 14, 1998 7:22 pm | |
| Poul-Henning Kamp | Sep 14, 1998 11:43 pm | |
| Mike Smith | Sep 15, 1998 2:39 am | |
| Mike Smith | Sep 15, 1998 3:43 am | |
| Bob Bishop | Sep 15, 1998 3:44 am | |
| Alfred Perlstein | Sep 15, 1998 4:31 am | |
| Matthew N. Dodd | Sep 15, 1998 7:49 am | |
| Terry Lambert | Sep 15, 1998 1:01 pm | |
| Terry Lambert | Sep 15, 1998 1:05 pm | |
| Terry Lambert | Sep 15, 1998 1:10 pm | |
| Joel Ray Holveck | Sep 15, 1998 1:52 pm | |
| Gary Palmer | Sep 15, 1998 2:49 pm | |
| Mike Smith | Sep 15, 1998 3:58 pm | |
| Lee Cremeans | Sep 15, 1998 4:37 pm | |
| Poul-Henning Kamp | Sep 16, 1998 12:04 am | |
| Mike Smith | Sep 16, 1998 12:23 am | |
| Poul-Henning Kamp | Sep 16, 1998 12:25 am | |
| Terry Lambert | Sep 16, 1998 1:54 pm | |
| Terry Lambert | Sep 16, 1998 2:53 pm | |
| Mike Smith | Sep 16, 1998 2:55 pm | |
| Mike Smith | Sep 16, 1998 3:10 pm | |
| Terry Lambert | Sep 16, 1998 4:04 pm | |
| Terry Lambert | Sep 16, 1998 4:05 pm | |
| Mike Smith | Sep 16, 1998 4:25 pm | |
| Stephen Hocking-Senior Programmer PGS Tensor Perth | Sep 16, 1998 7:32 pm | |
| Bob Bishop | Sep 17, 1998 1:57 am | |
| Dan Strick | Sep 17, 1998 2:05 am | |
| Mike Smith | Sep 17, 1998 9:18 am | |
| Terry Lambert | Sep 17, 1998 5:46 pm | |
| Mike Smith | Sep 17, 1998 6:13 pm | |
| Terry Lambert | Sep 17, 1998 7:03 pm | |
| Joel Ray Holveck | Sep 17, 1998 7:38 pm |
| Subject: | Re: Download of FreeBSD 3.0-SNAP | |
|---|---|---|
| From: | Mike Smith (mi...@smith.net.au) | |
| Date: | Sep 16, 1998 12:23:58 am | |
| List: | org.freebsd.freebsd-current | |
In message <1998...@dingo.cdrom.com>, Mike Smith writes:
Without knowing the true geometry of the disk (which I assume EIDE doesn't allow), we can't optimize for the cylinder patterns anyway, so I suppose it's a moot issue. I suppose that by manually specifying the geometry at format time then it could be slightly optimized for those hdd's that come with true geometry. Was that taken out because the computation was outweighing the seek time benefits, or what?
Disk geometry is nonlinear, and the calculations involved in optimising for it are complex and not really compatible with the optimisations for this sort of thing already part of the filesystem.
... Which have been disabled since 2.0.5 or something, we're now running on a pseudo geometry which fails horribly on huge disks.
It's better than what we'd have otherwise.
According to Kirk, 16 to 32 is the right number of cylinder groups, all over 50 is waste. we can end up with 200+ cgs on modern disks :-(
Yay, even less locality of reference. You were paying attention to the thread on inode allocation policies that went past just recently?
There's no such thing as "true geometry" anymore.
Well, there is, but we'd like to avoid having to deal with it.
Gawd, and the pedants out from the voodvork came.
-- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mi...@smith.net.au \\ The race is long, and in the \\ msm...@freebsd.org \\ end it's only with yourself. \\ msm...@cdrom.com
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