linux-kernel - Re: x264 benchmarks BFS vs 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]

Message-Id: <1261047618.14314.6.camel@localhost>
Date:	Thu, 17 Dec 2009 12:00:18 +0100
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jason Garrett-Glaser <darkshikari@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML Mailinglist <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: x264 benchmarks BFS vs CFS

On Thu, 2009-12-17 at 11:53 +0100, Ingo Molnar wrote:
> * Jason Garrett-Glaser <darkshikari@...il.com> wrote:
> 
> > On Thu, Dec 17, 2009 at 1:33 AM, Kasper Sandberg <lkml@...anurb.dk> wrote:
> > > well well :) nothing quite speaks out like graphs..
> > >
> > > http://doom10.org/index.php?topic=78.0
> > >
> > >
> > >
> > > regards,
> > > Kasper Sandberg
> > 
> > Yeah, I sent this to Mike a bit ago.  Seems that .32 has basically tied 
> > it--and given the strict thread-ordering expectations of x264, you basically 
> > can't expect it to do any better, though I'm curious what's responsible for 
> > the gap in "veryslow", even with SCHED_BATCH enabled.
> > 
> > The most odd case is that of "ultrafast", in which CFS immediately ties BFS 
> > when we enable SCHED_BATCH.  We're doing some further testing to see exactly 

Thats kinda besides the point.

all these tunables and weirdness is _NEVER_ going to work for people.

now forgive me for being so blunt, but for a user, having to do
echo x264 > /proc/cfs/gief_me_performance_on_app
or
echo some_benchmark > x264 > /proc/cfs/gief_me_performance_on_app

just isnt usable, bfs matches, even exceeds cfs on all accounts, with
ZERO user tuning, so while cfs may be able to nearly match up with a ton
of application specific stuff, that just doesnt work for a normal user.

not to mention that bfs does this whilst not loosing interactivity,
something which cfs certainly cannot boast.

<snip>


> Thanks,
> 
> 	Ingo
> --
> 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/


--
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/