40 messages in org.freebsd.freebsd-archRe: CFR: m_tag patch| From | Sent On | Attachments |
|---|---|---|
| Sam Leffler | Oct 6, 2002 9:38 pm | |
| Nate Lawson | Oct 6, 2002 10:01 pm | |
| Sam Leffler | Oct 6, 2002 10:21 pm | |
| Terry Lambert | Oct 6, 2002 11:09 pm | |
| Julian Elischer | Oct 6, 2002 11:32 pm | |
| Julian Elischer | Oct 7, 2002 12:29 am | |
| Sam Leffler | Oct 7, 2002 9:24 am | |
| Sam Leffler | Oct 7, 2002 9:31 am | |
| Sam Leffler | Oct 7, 2002 9:46 am | |
| Julian Elischer | Oct 7, 2002 2:20 pm | |
| Terry Lambert | Oct 7, 2002 3:34 pm | |
| Sam Leffler | Oct 7, 2002 3:52 pm | |
| Julian Elischer | Oct 7, 2002 4:10 pm | |
| Julian Elischer | Oct 7, 2002 4:22 pm | |
| Luigi Rizzo | Oct 7, 2002 4:30 pm | |
| Julian Elischer | Oct 7, 2002 4:55 pm | |
| Sam Leffler | Oct 7, 2002 5:06 pm | |
| Julian Elischer | Oct 7, 2002 5:10 pm | |
| Julian Elischer | Oct 7, 2002 5:14 pm | |
| Julian Elischer | Oct 7, 2002 5:23 pm | |
| Terry Lambert | Oct 7, 2002 5:31 pm | |
| Terry Lambert | Oct 7, 2002 5:47 pm | |
| Nate Lawson | Oct 7, 2002 10:42 pm | |
| Don Lewis | Oct 7, 2002 11:06 pm | |
| Julian Elischer | Oct 7, 2002 11:28 pm | |
| Julian Elischer | Oct 7, 2002 11:32 pm | |
| Terry Lambert | Oct 8, 2002 12:42 am | |
| Terry Lambert | Oct 8, 2002 12:53 am | |
| Harti Brandt | Oct 8, 2002 1:19 am | |
| Nate Lawson | Oct 8, 2002 11:25 am | |
| Don Lewis | Oct 8, 2002 12:15 pm | |
| Sam Leffler | Oct 8, 2002 6:25 pm | |
| JINMEI Tatuya / 神明達哉 | Oct 10, 2002 7:33 pm | |
| Sam Leffler | Oct 11, 2002 11:11 am | |
| JINMEI Tatuya / 神明達哉 | Oct 16, 2002 3:03 am | |
| Luigi Rizzo | Oct 16, 2002 7:45 am | |
| JINMEI Tatuya / 神明達哉 | Oct 16, 2002 11:06 am | |
| Luigi Rizzo | Oct 16, 2002 11:18 am | |
| Julian Elischer | Oct 16, 2002 11:24 am | |
| Sam Leffler | Oct 16, 2002 11:29 am |
| Subject: | Re: CFR: m_tag patch | |
|---|---|---|
| From: | Luigi Rizzo (riz...@icir.org) | |
| Date: | Oct 7, 2002 4:30:39 pm | |
| List: | org.freebsd.freebsd-arch | |
the 16 vs. 32 bit On Mon, Oct 07, 2002 at 03:52:49PM -0700, Sam Leffler wrote: ...
Sounds to me like the real issue for you is insuring unique m_tag_id values. We're certainly less likely to have collisions with a 32-bit value than a 16-bit value and expanding this way gives you your "field ID" too. I guess the question I have is whether the existing API's that search only by "cookie" are sufficient for your needs. If so then I'm ok with changing things. Otherwise we have an API incompatibility with openbsd that I'd like to avoid.
i wonder what do we gain by moving to 32 bit m_tag_id -- because there is is still no strict guarantee that we have no conflicts if people randomly choose "cookies", and also, using the same reasoning for allocations one could argue that having the cookie chosen as the number of _days_ since the epoch, will still give low conflict probability while still fitting in 16 bits. Also, those modules that require one or a very small number of different annotations (e.g. all the ones currently using m_tags) would just need the "cookie", whereas others with a large set of subfields could as well consider the field_id as part of the opaque data.
cheers luigi ----------------------------------+----------------------------------------- Luigi RIZZO, lui...@iet.unipi.it . ICSI (on leave from Univ. di Pisa) http://www.iet.unipi.it/~luigi/ . 1947 Center St, Berkeley CA 94704 Phone: (510) 666 2988 ----------------------------------+-----------------------------------------
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