From: Will Deacon <will@kernel.org>
To: Tanmay Jagdale <tanmay@marvell.com>
Cc: robin.murphy@arm.com, joro@8bytes.org, nicolinc@nvidia.com,
mshavit@google.com, baolu.lu@linux.intel.com,
thunder.leizhen@huawei.com, set_pte_at@outlook.com,
smostafa@google.com, sgoutham@marvell.com, gcherian@marvell.com,
jcm@jonmasters.org, linux-arm-kernel@lists.infradead.org,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V3 0/2] iommu/arm-smmu-v3: Add support for ECMDQ register mode
Date: Tue, 30 Apr 2024 16:09:50 +0100 [thread overview]
Message-ID: <20240430150950.GD14187@willie-the-truck> (raw)
In-Reply-To: <20240425144152.52352-1-tanmay@marvell.com>
On Thu, Apr 25, 2024 at 07:41:50AM -0700, Tanmay Jagdale wrote:
> Resending the patches by Zhen Lei <thunder.leizhen@huawei.com> that add
> support for SMMU ECMDQ feature.
>
> Tested this feature on a Marvell SoC by implementing a smmu-test driver.
> This test driver spawns a thread per CPU and each thread keeps sending
> map, table-walk and unmap requests for a fixed duration.
>
> Using this test driver, we compared ECMDQ vs SMMU with software batching
> support and saw ~5% improvement with ECMDQ. Performance numbers are
> mentioned below:
>
> Total Requests Average Requests Difference
> Per CPU wrt ECMDQ
> -----------------------------------------------------------------
> ECMDQ 239286381 2991079
> CMDQ Batch Size 1 228232187 2852902 -4.62%
> CMDQ Batch Size 32 233465784 2918322 -2.43%
> CMDQ Batch Size 64 231679588 2895994 -3.18%
> CMDQ Batch Size 128 233189030 2914862 -2.55%
> CMDQ Batch Size 256 230965773 2887072 -3.48%
These are pretty small improvements in a targetted micro-benchmark. Do
you have any real-world numbers showing that this is worthwhile? For
example, running something like netperf.
Will
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next prev parent reply other threads:[~2024-04-30 15:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-25 14:41 [PATCH V3 0/2] iommu/arm-smmu-v3: Add support for ECMDQ register mode Tanmay Jagdale
2024-04-25 14:41 ` [PATCH V3 1/2] " Tanmay Jagdale
2024-04-28 2:19 ` Leizhen (ThunderTown)
2024-04-25 14:41 ` [PATCH V3 2/2] iommu/arm-smmu-v3: Ensure that a set of associated commands are inserted in the same ECMDQ Tanmay Jagdale
2024-04-28 2:08 ` [PATCH V3 0/2] iommu/arm-smmu-v3: Add support for ECMDQ register mode Leizhen (ThunderTown)
2024-04-30 15:09 ` Will Deacon [this message]
2024-05-16 14:25 ` Tanmay Jagdale
2024-05-02 16:25 ` Jason Gunthorpe
-- strict thread matches above, loose matches on Subject: below --
2024-04-25 14:30 Tanmay Jagdale
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