linux-kernel - Re: [PATCH v3 00/15] honor isolcpus configuration

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Message-ID: <f48a032f-e1e0-42fc-afc6-5aa5ccc3514d@flourine.local>
Date: Wed, 7 Aug 2024 14:25:39 +0200
From: Daniel Wagner <dwagner@...e.de>
To: Stefan Hajnoczi <stefanha@...il.com>
Cc: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>, 
	Sagi Grimberg <sagi@...mberg.me>, Thomas Gleixner <tglx@...utronix.de>, 
	Christoph Hellwig <hch@....de>, "Martin K. Petersen" <martin.petersen@...cle.com>, 
	John Garry <john.g.garry@...cle.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
	Jason Wang <jasowang@...hat.com>, Kashyap Desai <kashyap.desai@...adcom.com>, 
	Sumit Saxena <sumit.saxena@...adcom.com>, Shivasharan S <shivasharan.srikanteshwara@...adcom.com>, 
	Chandrakanth patil <chandrakanth.patil@...adcom.com>, Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>, 
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>, Nilesh Javali <njavali@...vell.com>, 
	GR-QLogic-Storage-Upstream@...vell.com, Jonathan Corbet <corbet@....net>, 
	Frederic Weisbecker <frederic@...nel.org>, Mel Gorman <mgorman@...e.de>, Hannes Reinecke <hare@...e.de>, 
	Sridhar Balaraman <sbalaraman@...allelwireless.com>, "brookxu.cn" <brookxu.cn@...il.com>, 
	Ming Lei <ming.lei@...hat.com>, linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, 
	linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org, virtualization@...ts.linux.dev, 
	megaraidlinux.pdl@...adcom.com, mpi3mr-linuxdrv.pdl@...adcom.com, 
	MPT-FusionLinux.pdl@...adcom.com, storagedev@...rochip.com, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 00/15] honor isolcpus configuration

On Tue, Aug 06, 2024 at 09:09:50AM GMT, Stefan Hajnoczi wrote:
> On Tue, 6 Aug 2024 at 08:10, Daniel Wagner <dwagner@...e.de> wrote:
> > The only stall I was able to trigger
> > reliable was with qemu's PCI emulation. It looks like when a CPU is
> > offlined, the PCI affinity is reprogrammed but qemu still routes IRQs to
> > an offline CPU instead to newly programmed destination CPU. All worked
> > fine on real hardware.
> 
> Hi Daniel,
> Please file a QEMU bug report here (or just reply to this emails with
> details on how to reproduce the issue and I'll file the issue on your
> behalf):
> https://gitlab.com/qemu-project/qemu/-/issues
> 
> We can also wait until your Linux patches have landed if that makes it
> easier to reproduce the bug.

Thanks for the offer. I tried simplify the setup and come up with
producer using qemu directly instead with libvirt. And now it works just
fine. I'll try to figure out what the magic argument...