linux-kernel - Re: CFS scheduler unfairly prefers pinned tasks

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]

Message-ID: <20151008111959.GM3816@twins.programming.kicks-ass.net>
Date:	Thu, 8 Oct 2015 13:19:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	paul.szabo@...ney.edu.au
Cc:	umgwanakikbuti@...il.com, linux-kernel@...r.kernel.org
Subject: Re: CFS scheduler unfairly prefers pinned tasks

On Thu, Oct 08, 2015 at 09:54:21PM +1100, paul.szabo@...ney.edu.au wrote:
> Good to see that you agree on the fairness issue... it MUST be fixed!
> CFS might be wrong or wasteful, but never unfair.

I've not yet had time to look at the case at hand, but there are wat is
called 'infeasible weight' scenarios for which it is impossible to be
fair.

Also, CFS must remain a practical scheduler, which places bounds on the
amount of weird cases we can deal with.
--
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/