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: | Terry Lambert (tlam...@primenet.com) | |
| Date: | Sep 15, 1998 1:05:57 pm | |
| List: | org.freebsd.freebsd-current | |
I don't think anyone would disagree with this; my point was simply that disks are effectively nondeterministic, so by definition you can't have an "optimal" solution.
Bull. Hardware and software are no more non-deterministic than neutron numbers or when sunrise will occur.
I've seen assorted drive literature describing different caching policies on modern drives, and I think it's probably in our interest not to try too hard to outsmart the disk these days, as it's busy trying to outsmart us.
This isn't a very valid argument. If it wre, we should agressively discard cached pages in main memory, on the theory that the disk controller knows better than we do what pages we will need next.
There is such a thing as locality of reference, which has nothing to do with locality of disk blocks within a contiguous set of blocks.
This is the primary reason why the correct thing to do about the ports tree is a breadth-first restore from a depth-first archive.
If you really wanted to play games with the queue sorter, you might want to go for a minimal distance insertion policy rather than a strict ladder sort. As Kirk pointed out, there's plenty of room for experimentation in this field. 8)
Actually, much of this has already been covered in the literature in the 17 years between 1981 and now...
Terry Lambert ter...@lambert.org
--- Any opinions in this posting are my own and not those of my present or previous employers.
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