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: <8763pjpy2b.fsf@basil.nowhere.org>
Date:	Fri, 29 Aug 2008 18:48:12 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Brice Goglin <Brice.Goglin@...ia.fr>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [RFC] export irq_set/get_affinity() for multiqueue network drivers

Arjan van de Ven <arjan@...radead.org> writes:

> On Thu, 28 Aug 2008 22:21:53 +0200
> Brice Goglin <Brice.Goglin@...ia.fr> wrote:
>
>> Hello,
>> 
>> Is there any way to setup IRQ masks from within a driver? myri10ge
>> currently relies on an external script (writing in
>> /proc/irq/*/smp_affinity) to bind each queue/MSI-X to a different
>> processor. By default, Linux will either:
>> * round-robin the interrupts (killing the benefit of DCA for instance)
>> * put all IRQs on the same CPU (killing much of th
>
> * do the right thing with the userspace irq balancer

It probably also needs to be hooked up the sched_mc_power_savings
When the switch is on the interrupts shouldn't be spread out over
that many sockets.

Does it need callbacks to change the interrupts when that variable
changes?

Also I suspect handling SMT explicitely is a good idea. e.g. I would
always set the affinity to all thread siblings in a core, not 
just a single one, because context switch is very cheap between them.

-Andi

-- 
ak@...ux.intel.com
--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ