From: Tanmay Jagdale <tj@cn10ka>
To: Will Deacon <will@kernel.org>
Cc: Tanmay Jagdale <tanmay@marvell.com>, <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>,
<gakula@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: Thu, 16 May 2024 07:25:39 -0700 [thread overview]
Message-ID: <ZkYWbhTOEBu5vUVk@cn10ka> (raw)
In-Reply-To: <20240430150950.GD14187@willie-the-truck>
Hi Will,
On Tue, Apr 30, 2024 at 04:09:50PM +0100, Will Deacon wrote:
> 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.
We are running benchmarks on the latest kernel with and without ECMDQ.
We will share the performance numbers and observations here.
With Regards,
Tanmay
>
> Will
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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next prev parent reply other threads:[~2024-05-16 14:26 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
2024-05-16 14:25 ` Tanmay Jagdale [this message]
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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