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 loc

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 cl

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

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

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 ar

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,

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 ben

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: http://feanor.sssup.it/~fabio/freebsd/g_sched/geom