linux-kernel - Re: [PATCH 3/3] sched: Disable affine wakeups by default

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 26 Oct 2009 00:05:17 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sched: Disable affine wakeups by default

On Mon, 26 Oct 2009 08:01:12 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Mike Galbraith <efault@....de> wrote:
> 
> > On Mon, 2009-10-26 at 06:47 +0100, Mike Galbraith wrote:
> > > On Sun, 2009-10-25 at 22:36 -0700, Arjan van de Ven wrote:
> > 
> > > > if you're a multicore domain you better have a shared cache.. 
> > > > that's what it should mean. If it does not we should fix that.
> > > 
> > > Sounds reasonable to me.  I'll go make explosions.
> > 
> > (Actually, if multicode and sibling does indeed mean shared cache,
> > no arch tinkering should be necessary, just reset SD_WAKE_AFFINE
> > when degenerating should work fine.  Only thing is multicore with 
> > siblings.. and test test test)
> 
> Correct. There's a few cpus where multicore means separate caches but 
> all modern CPUs have shared caches for cores so we want to tune for 
> that.

for those cpus where mc means separate caches we should fix the arch
code to set up separate MC domains to be honest..
I can look into that in a bit..


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/