linux-kernel - Re: [patch] sched: fix broken smt/mc optimizations with CFS

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 for Android: free password hash cracker in your pocket

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

Date:	Mon, 27 Aug 2007 12:31:03 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [patch] sched: fix broken smt/mc optimizations with CFS

On Mon, Aug 27, 2007 at 09:23:24PM +0200, Ingo Molnar wrote:
> 
> * Siddha, Suresh B <suresh.b.siddha@...el.com> wrote:
> 
> > > -	if (*imbalance + SCHED_LOAD_SCALE_FUZZ < busiest_load_per_task/2) {
> > > +	if (*imbalance + SCHED_LOAD_SCALE_FUZZ < busiest_load_per_task) {
> > 
> > Ingo, this is still broken. This condition is always false for nice-0 
> > tasks..
> 
> yes - negative reniced tasks are not spread out via this - and positive 
> reniced tasks are spread out more easily.

Or the opposite?

Essentially I observed that nice 0 tasks still endup on two cores of same
package, with out getting spread out to two different packages. This behavior
is same with out this fix and this fix doesn't help in any way.

thanks,
suresh
-
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/