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From: James Smart <jsmart2021@gmail.com>
To: Nitesh Narayan Lal <nitesh@redhat.com>,
	linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
	linux-api@vger.kernel.org, linux-pci@vger.kernel.org,
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	robin.murphy@arm.com, mtosatti@redhat.com, mingo@kernel.org,
	jbrandeb@kernel.org, frederic@kernel.org, juri.lelli@redhat.com,
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	sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com,
	suganath-prabu.subramani@broadcom.com, james.smart@broadcom.com,
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	chandrakanth.patil@broadcom.com, bjorn.andersson@linaro.org,
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	viresh.kumar@linaro.org, Tushar.Khandelwal@arm.com,
	kuba@kernel.org
Subject: Re: [PATCH v5 11/14] scsi: lpfc: Use irq_set_affinity
Date: Fri, 23 Jul 2021 10:15:12 -0700	[thread overview]
Message-ID: <f1512e42-f2fa-b4e7-4133-4a6066b7ea0d@gmail.com> (raw)
In-Reply-To: <20210720232624.1493424-12-nitesh@redhat.com>

On 7/20/2021 4:26 PM, Nitesh Narayan Lal wrote:
> The driver uses irq_set_affinity_hint to set the affinity for the lpfc
> interrupts to a mask corresponding to the local NUMA node to avoid
> performance overhead on AMD architectures.
> 
> However, irq_set_affinity_hint() setting the affinity is an undocumented
> side effect that this function also sets the affinity under the hood.
> To remove this side effect irq_set_affinity_hint() has been marked as
> deprecated and new interfaces have been introduced.
> 
> Also, as per the commit dcaa21367938 ("scsi: lpfc: Change default IRQ model
> on AMD architectures"):
> "On AMD architecture, revert the irq allocation to the normal style
> (non-managed) and then use irq_set_affinity_hint() to set the cpu affinity
> and disable user-space rebalancing."
> we don't really need to set the affinity_hint as user-space rebalancing for
> the lpfc interrupts is not desired.
> 
> Hence, replace the irq_set_affinity_hint() with irq_set_affinity() which
> only applies the affinity for the interrupts.
> 
> Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
> ---
>   drivers/scsi/lpfc/lpfc_init.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 

Looks good. Thanks

Reviewed-by: James Smart <jsmart2021@gmail.com>

-- james


  reply	other threads:[~2021-07-23 17:15 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-20 23:26 [PATCH v5 00/14] genirq: Cleanup the abuse of irq_set_affinity_hint() Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 01/14] genirq: Provide new interfaces for affinity hints Nitesh Narayan Lal
2021-08-06 15:51   ` Ming Lei
2021-07-20 23:26 ` [PATCH v5 02/14] iavf: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 03/14] i40e: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 04/14] scsi: megaraid_sas: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-08-06 11:31   ` Sumit Saxena
2021-07-20 23:26 ` [PATCH v5 05/14] scsi: mpt3sas: " Nitesh Narayan Lal
2021-08-06  8:54   ` Sreekanth Reddy
2021-07-20 23:26 ` [PATCH v5 06/14] RDMA/irdma: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-07-22 18:25   ` Nikolova, Tatyana E
2021-07-20 23:26 ` [PATCH v5 07/14] enic: " Nitesh Narayan Lal
2021-08-16 17:53   ` Christian Benvenuti (benve)
2021-07-20 23:26 ` [PATCH v5 08/14] be2net: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 09/14] ixgbe: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 10/14] mailbox: " Nitesh Narayan Lal
2021-08-16 18:11   ` Jassi Brar
2021-07-20 23:26 ` [PATCH v5 11/14] scsi: lpfc: Use irq_set_affinity Nitesh Narayan Lal
2021-07-23 17:15   ` James Smart [this message]
2021-07-20 23:26 ` [PATCH v5 12/14] hinic: Use irq_set_affinity_and_hint Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 13/14] net/mlx5: " Nitesh Narayan Lal
2021-07-20 23:26 ` [PATCH v5 14/14] net/mlx4: Use irq_update_affinity_hint Nitesh Narayan Lal
2021-08-02 15:26 ` [PATCH v5 00/14] genirq: Cleanup the abuse of irq_set_affinity_hint() Nitesh Lal
2021-08-06  3:04   ` Martin K. Petersen
2021-08-06 14:56     ` Nitesh Lal
2021-08-16 15:50   ` Nitesh Lal
2021-08-30 15:38     ` Nitesh Lal
2021-08-30 15:40       ` Nitesh Lal

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