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From: Christoph Hellwig <hch@infradead.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Christoph Hellwig <hch@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Doug Ledford <dledford@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	linux-rdma@vger.kernel.org,
	Subbu Seetharaman <subbu.seetharaman@broadcom.com>,
	Ketan Mukadam <ketan.mukadam@broadcom.com>,
	Jitendra Bhivare <jitendra.bhivare@broadcom.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	"Manoj N. Kumar" <manoj@linux.ibm.com>,
	"Matthew R. Ochs" <mrochs@linux.ibm.com>,
	Uma Krishnan <ukrishn@linux.ibm.com>,
	Brian King <brking@us.ibm.com>,
	James Smart <james.smart@broadcom.com>,
	Dick Kennedy <dick.kennedy@broadcom.com>,
	Kashyap Desai <kashyap.desai@broadcom.com>,
	Sumit Saxena <sumit.saxena@broadcom.com>,
	Shivasharan S <shivasharan.srikanteshwara@broadcom.com>,
	megaraidlinux.pdl@broadcom.com,
	Sathya Prakash <sathya.prakash@broadcom.com>,
	Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
	Suganath Prabu Subramani  <suganath-prabu.subramani@broadcom.com>,
	MPT-FusionLinux.pdl@broadcom.com
Subject: Re: [RFC] Is lib/irq_poll still considered useful?
Date: Fri, 1 Oct 2021 05:24:49 +0100	[thread overview]
Message-ID: <YVaNkVXYUt6tIYvS@infradead.org> (raw)
In-Reply-To: <20210930105605.ofyayf3uwk75u25s@linutronix.de>

On Thu, Sep 30, 2021 at 12:56:05PM +0200, Sebastian Andrzej Siewior wrote:
> Is there a reason for the remaining user of irq_poll to keep using it?

At least for RDMA there are workloads where the latency difference
matters.  That's why we added both the irq_poll and workqueue mode
to thew new CQ API a few years ago.

  reply	other threads:[~2021-10-01  4:26 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-30 10:37 [PATCH] irq_poll: Use raise_softirq_irqoff() in cpu_dead notifier Sebastian Andrzej Siewior
2021-09-30 10:56 ` [RFC] Is lib/irq_poll still considered useful? Sebastian Andrzej Siewior
2021-10-01  4:24   ` Christoph Hellwig [this message]
2021-10-01  6:41     ` Sebastian Andrzej Siewior
2021-10-18  7:45 ` [PATCH] irq_poll: Use raise_softirq_irqoff() in cpu_dead notifier Sebastian Andrzej Siewior
2021-10-18 10:53 ` Christoph Hellwig
2021-10-18 11:49   ` Sebastian Andrzej Siewior

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