sx locks and memory barriers

Hi all, looking at sys/sx.h I have some troubles understanding this comment: * A note about memory barriers. Exclusive locks need to use the same * memory barriers as mutexes: _acq when acquiring an exclusive lock * and _rel when releasing an exclusive lock. On the other side, * shared

SoC2009: Geom-based Disk Schedulers

Hi all, I'm a PhD student, this summer I'll work on a SoC project on disk scheduling. I will extend the work we started with luigi, that we already presented in [1, 2]. Two of the main areas that still need improvement, and that will be considered during the project, are doing proper request

Re: Pluggable Disk Scheduler Project

From: Karsten Behrmann [EMAIL PROTECTED] Date: Tue, Oct 16, 2007 04:10:37PM +0200 Hi, is anybody working on the `Pluggable Disk Scheduler Project' from the ideas page? I've been kicking the idea around in my head, but I'm probably newer to everything involved than you are, so feel

Re: Pluggable Disk Scheduler Project

From: Ulf Lilleengen [EMAIL PROTECTED] Date: Wed, Oct 17, 2007 01:07:15PM +0200 On tir, okt 16, 2007 at 04:10:37 +0200, Karsten Behrmann wrote: Over to a more general view of it's architecture: When I looked at this project for the first time, I was under the impression that this would be

Re: Pluggable Disk Scheduler Project

From: Ulf Lilleengen [EMAIL PROTECTED] Date: Wed, Oct 17, 2007 03:09:35PM +0200 On ons, okt 17, 2007 at 02:19:07 +0200, Fabio Checconi wrote: Maybe I've not enough experience/knowledge of the driver subsystem, [...] If you look at it, Hybrid is just a generalization of the existing bioq_

Re: Pluggable Disk Scheduler Project

From: Alexander Leidinger [EMAIL PROTECTED] Date: Fri, Oct 12, 2007 08:18:35AM +0200 Quoting Fabio Checconi [EMAIL PROTECTED] (from Thu, 11 Oct 2007 13:48:28 +0200): From: Ulf Lilleengen [EMAIL PROTECTED] Date: Thu, Oct 11, 2007 10:07:34AM +0200 On tor, okt 11, 2007 at 04:20:01 +0200

Re: Pluggable Disk Scheduler Project

Hi, From: Ulf Lilleengen [EMAIL PROTECTED] Date: Thu, Oct 11, 2007 10:07:34AM +0200 On tor, okt 11, 2007 at 04:20:01 +0200, Fabio Checconi wrote: o is working on disk scheduling worth at all? It is hard to say, but I'd like to run some benchmarks with this to see. Also, noted in [2

Pluggable Disk Scheduler Project

Hi, is anybody working on the `Pluggable Disk Scheduler Project' from the ideas page? To better understand how GEOM works, and how a (non work conserving) disk scheduler can fit into it, I've written a very simple, yet working, prototype: