From: Theodore Ts'o <tytso@mit.edu>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-rdma@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-kernel@vger.kernel.org,
ksummit-discuss@lists.linuxfoundation.org
Subject: Re: [Ksummit-discuss] [TECH TOPIC] IRQ affinity
Date: Mon, 12 Oct 2015 12:09:48 -0400 [thread overview]
Message-ID: <20151012160948.GD20210@thunk.org> (raw)
In-Reply-To: <20150715120708.GA24534@infradead.org>
Hi Christoph,
Do you think this is still an issue that would be worth discsussing at
the kernel summit as a technical topic? If so, would you be willing
to be responsible for kicking off the discussion for this topic?
Thanks,
- Ted
On Wed, Jul 15, 2015 at 05:07:08AM -0700, Christoph Hellwig wrote:
> Many years ago we decided to move setting of IRQ to core affnities to
> userspace with the irqbalance daemon.
>
> These days we have systems with lots of MSI-X vector, and we have
> hardware and subsystem support for per-CPU I/O queues in the block
> layer, the RDMA subsystem and probably the network stack (I'm not too
> familar with the recent developments there). It would really help the
> out of the box performance and experience if we could allow such
> subsystems to bind interrupt vectors to the node that the queue is
> configured on.
>
> I'd like to discuss if the rationale for moving the IRQ affinity setting
> fully to userspace are still correct in todays world any any pitfalls
> we'll have to learn from in irqbalanced and the old in-kernel affinity
> code.
> _______________________________________________
> Ksummit-discuss mailing list
> Ksummit-discuss@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/ksummit-discuss
WARNING: multiple messages have this Message-ID (diff)
From: tytso@mit.edu (Theodore Ts'o)
Subject: [Ksummit-discuss] [TECH TOPIC] IRQ affinity
Date: Mon, 12 Oct 2015 12:09:48 -0400 [thread overview]
Message-ID: <20151012160948.GD20210@thunk.org> (raw)
In-Reply-To: <20150715120708.GA24534@infradead.org>
Hi Christoph,
Do you think this is still an issue that would be worth discsussing at
the kernel summit as a technical topic? If so, would you be willing
to be responsible for kicking off the discussion for this topic?
Thanks,
- Ted
On Wed, Jul 15, 2015@05:07:08AM -0700, Christoph Hellwig wrote:
> Many years ago we decided to move setting of IRQ to core affnities to
> userspace with the irqbalance daemon.
>
> These days we have systems with lots of MSI-X vector, and we have
> hardware and subsystem support for per-CPU I/O queues in the block
> layer, the RDMA subsystem and probably the network stack (I'm not too
> familar with the recent developments there). It would really help the
> out of the box performance and experience if we could allow such
> subsystems to bind interrupt vectors to the node that the queue is
> configured on.
>
> I'd like to discuss if the rationale for moving the IRQ affinity setting
> fully to userspace are still correct in todays world any any pitfalls
> we'll have to learn from in irqbalanced and the old in-kernel affinity
> code.
> _______________________________________________
> Ksummit-discuss mailing list
> Ksummit-discuss at lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/ksummit-discuss
WARNING: multiple messages have this Message-ID (diff)
From: Theodore Ts'o <tytso@mit.edu>
To: Christoph Hellwig <hch@infradead.org>
Cc: ksummit-discuss@lists.linuxfoundation.org,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvme@lists.infradead.org
Subject: Re: [Ksummit-discuss] [TECH TOPIC] IRQ affinity
Date: Mon, 12 Oct 2015 12:09:48 -0400 [thread overview]
Message-ID: <20151012160948.GD20210@thunk.org> (raw)
In-Reply-To: <20150715120708.GA24534@infradead.org>
Hi Christoph,
Do you think this is still an issue that would be worth discsussing at
the kernel summit as a technical topic? If so, would you be willing
to be responsible for kicking off the discussion for this topic?
Thanks,
- Ted
On Wed, Jul 15, 2015 at 05:07:08AM -0700, Christoph Hellwig wrote:
> Many years ago we decided to move setting of IRQ to core affnities to
> userspace with the irqbalance daemon.
>
> These days we have systems with lots of MSI-X vector, and we have
> hardware and subsystem support for per-CPU I/O queues in the block
> layer, the RDMA subsystem and probably the network stack (I'm not too
> familar with the recent developments there). It would really help the
> out of the box performance and experience if we could allow such
> subsystems to bind interrupt vectors to the node that the queue is
> configured on.
>
> I'd like to discuss if the rationale for moving the IRQ affinity setting
> fully to userspace are still correct in todays world any any pitfalls
> we'll have to learn from in irqbalanced and the old in-kernel affinity
> code.
> _______________________________________________
> Ksummit-discuss mailing list
> Ksummit-discuss@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/ksummit-discuss
next prev parent reply other threads:[~2015-10-12 16:10 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 12:07 [Ksummit-discuss] [TECH TOPIC] IRQ affinity Christoph Hellwig
2015-07-15 12:07 ` Christoph Hellwig
2015-07-15 12:07 ` Christoph Hellwig
2015-07-15 12:07 ` Christoph Hellwig
2015-07-15 12:12 ` [Ksummit-discuss] " Thomas Gleixner
2015-07-15 12:12 ` Thomas Gleixner
2015-07-15 12:12 ` Thomas Gleixner
2015-07-15 12:12 ` Thomas Gleixner
2015-07-15 15:41 ` Bart Van Assche
2015-07-15 15:41 ` Bart Van Assche
2015-07-15 15:41 ` Bart Van Assche
2015-07-15 15:41 ` Bart Van Assche
2015-07-15 17:19 ` Keith Busch
2015-07-15 17:19 ` Keith Busch
2015-07-15 17:19 ` Keith Busch
2015-07-15 17:19 ` Keith Busch
2015-07-15 17:25 ` Jens Axboe
2015-07-15 17:25 ` Jens Axboe
2015-07-15 17:25 ` Jens Axboe
2015-07-15 17:25 ` Jens Axboe
2015-07-15 18:24 ` Sagi Grimberg
2015-07-15 18:24 ` Sagi Grimberg
2015-07-15 18:24 ` Sagi Grimberg
2015-07-15 18:48 ` Matthew Wilcox
2015-07-15 18:48 ` Matthew Wilcox
2015-07-15 18:48 ` Matthew Wilcox
2015-07-16 6:13 ` Michael S. Tsirkin
2015-07-16 6:13 ` Michael S. Tsirkin
2015-07-16 6:13 ` Michael S. Tsirkin
2015-07-16 6:13 ` Michael S. Tsirkin
2015-07-17 15:51 ` Thomas Gleixner
2015-07-17 15:51 ` Thomas Gleixner
2015-07-17 15:51 ` Thomas Gleixner
2015-07-17 15:51 ` Thomas Gleixner
2015-07-15 14:38 ` Christoph Lameter
2015-07-15 14:38 ` Christoph Lameter
2015-07-15 14:38 ` Christoph Lameter
2015-07-15 14:56 ` [Ksummit-discuss] " Marc Zyngier
2015-07-15 14:56 ` Marc Zyngier
2015-07-15 14:56 ` Marc Zyngier
2015-07-15 16:05 ` Michael S. Tsirkin
2015-07-15 16:05 ` Michael S. Tsirkin
2015-07-15 16:05 ` Michael S. Tsirkin
2015-07-15 16:05 ` Michael S. Tsirkin
2015-10-12 16:09 ` Theodore Ts'o [this message]
2015-10-12 16:09 ` Theodore Ts'o
2015-10-12 16:09 ` Theodore Ts'o
2015-10-12 18:41 ` Christoph Hellwig
2015-10-12 18:41 ` Christoph Hellwig
2015-10-14 15:56 ` Theodore Ts'o
2015-10-14 15:56 ` Theodore Ts'o
2015-10-14 15:56 ` Theodore Ts'o
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