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RE: vk_l4 -- CVS Setup
From: |
Volkmar Uhlig |
Subject: |
RE: vk_l4 -- CVS Setup |
Date: |
Mon, 29 Oct 2001 12:38:02 +0100 |
> -----Original Message-----
> From: Debian UserAd Buijsen [mailto:address@hidden
> Sent: Monday, October 29, 2001 11:19 AM
> >>
> >> > Version 2 of the L4 spec. has Unique IDs containing a
> "site" field, so kernel-assisted
> >> > remote IPC was considered at a time, I presume. A
> "site-fault" for non-local IPC would be
> >> > one method to handle it, or a generalized form of IPC
> redirection.
> >>
> >> Cool. I've only read the X.0 spec, I believe. Where can I
> find the newer specs?
> >>
> >> -- Ian
> >>
>
> Version 2 is the old one; the 'X' versions are experimental
> and will lead to version 4, which
> seems to be in review at the moment. Version 3 appears to
> have been mislaid...
The site field was dropped for usability and performance reasons. A
compatible system can always be constructed using transparent proxy
threads. The advantage is one additional register (50% more) for short
IPC on x86. Version 4 will not have a site field either -- so do not
rely on it.
Version 3 was somewhere in between X.0 and V4 and retired in an
experimental state.
- Volkmar