From: Jacob Pan <jacob.pan@linux.microsoft.com>
To: linux-kernel@vger.kernel.org,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
Will Deacon <will@kernel.org>, Jason Gunthorpe <jgg@nvidia.com>,
Robin Murphy <robin.murphy@arm.com>,
Nicolin Chen <nicolinc@nvidia.com>
Cc: Zhang Yu <zhangyu1@linux.microsoft.com>,
Jean Philippe-Brucker <jean-philippe@linaro.org>,
Alexander Grest <Alexander.Grest@microsoft.com>,
Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH 0/2] SMMU v3 CMDQ fix and improvement
Date: Mon, 6 Oct 2025 08:14:29 -0700 [thread overview]
Message-ID: <20251006081429.000002c0@linux.microsoft.com> (raw)
In-Reply-To: <20250924175438.7450-1-jacob.pan@linux.microsoft.com>
Hi, any thoughts on these?
@Jason @Nicolin
On Wed, 24 Sep 2025 10:54:36 -0700
Jacob Pan <jacob.pan@linux.microsoft.com> wrote:
> Hi Will et al,
>
> These two patches are derived from testing SMMU driver with smaller
> CMDQ sizes where we see soft lockups.
>
> This happens on HyperV emulated SMMU v3 as well as baremetal ARM
> servers with artificially reduced queue size and microbenchmark to
> stress test concurrency.
>
> Thanks,
>
> Jacob
>
>
> Alexander Grest (1):
> iommu/arm-smmu-v3: Improve CMDQ lock fairness and efficiency
>
> Jacob Pan (1):
> iommu/arm-smmu-v3: Fix CMDQ timeout warning
>
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 85
> +++++++++------------ 1 file changed, 35 insertions(+), 50
> deletions(-)
>
next prev parent reply other threads:[~2025-10-06 15:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-24 17:54 [PATCH 0/2] SMMU v3 CMDQ fix and improvement Jacob Pan
2025-09-24 17:54 ` [PATCH 1/2] iommu/arm-smmu-v3: Fix CMDQ timeout warning Jacob Pan
2025-10-07 0:44 ` Nicolin Chen
2025-10-07 16:12 ` Jacob Pan
2025-10-07 16:32 ` Nicolin Chen
2025-09-24 17:54 ` [PATCH 2/2] iommu/arm-smmu-v3: Improve CMDQ lock fairness and efficiency Jacob Pan
2025-10-07 1:08 ` Nicolin Chen
2025-10-07 18:16 ` Jacob Pan
2025-10-17 11:04 ` Mostafa Saleh
2025-10-19 5:32 ` Jacob Pan
2025-10-06 15:14 ` Jacob Pan [this message]
2025-10-16 15:31 ` [PATCH 0/2] SMMU v3 CMDQ fix and improvement Jacob Pan
2025-10-17 10:57 ` Mostafa Saleh
2025-10-17 13:51 ` Jason Gunthorpe
2025-10-17 14:44 ` Robin Murphy
2025-10-17 16:50 ` Jacob Pan
2025-10-20 12:02 ` Jason Gunthorpe
2025-10-20 18:57 ` Jacob Pan
2025-10-21 11:45 ` Robin Murphy
2025-10-21 20:37 ` Jacob Pan
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