linux-kernel - Re: [RFC PATCH 0/6] Convert all tasklets to workqueues

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: <1182523414.2672.16.camel@laptopd505.fenrus.org>
Date:	Fri, 22 Jun 2007 07:43:34 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>,
	john stultz <johnstul@...ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, matthew.wilcox@...com,
	kuznet@....inr.ac.ru
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues


> 
> This is stated on the assumption that pretty much all performance
> critical tasklets have been removed (although Christoph just mentioned
> megaraid_sas, but after I made this statement).
> 
> We've been running tasklets as threads in the -rt kernel for some time
> now, and that hasn't bothered us.
> 
> The problem with tasklets is that they still don't provide guaranteed
> performance. They can still be pushed off to ksoftirqd on a busy system.
> But having *all* tasklets as they are today, keeps them at a higher
> priority then any process in the system.


don't get me wrong, I'm not against this conversion, just it needs to be
measured in detail... or preferably done step by step so that the
performance guys can undo one piece at a time until they find a guilty
party ;)

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.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/