From: Marc Zyngier <maz@kernel.org>
To: John Garry <john.garry@huawei.com>
Cc: Ming Lei <ming.lei@redhat.com>,
Robin Murphy <robin.murphy@arm.com>,
iommu@lists.linux-foundation.org, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node
Date: Thu, 22 Jul 2021 13:53:59 +0100 [thread overview]
Message-ID: <411dfc7cd330df1f681137d77e846b78@misterjones.org> (raw)
In-Reply-To: <fc552129-e89d-74ad-9e57-30e3ffe4cf5d@huawei.com>
On 2021-07-22 12:12, John Garry wrote:
Hi John,
[...]
> Your kernel log should show:
> [ 0.000000] GICv3: Pseudo-NMIs enabled using forced ICC_PMR_EL1
> synchronisation
Unrelated, but you seem to be running with ICC_CTLR_EL3.PMHE set,
which makes the overhead of pseudo-NMIs much higher than it should be
(you take a DSB SY on each interrupt unmasking).
If you are not using 1:N distribution of SPIs on the secure side,
consider turning that off in your firmware. This should make NMIs
slightly more pleasant to use.
M.
--
Jazz is not dead. It just smells funny...
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next prev parent reply other threads:[~2021-07-22 13:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-09 8:38 [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node Ming Lei
2021-07-09 10:16 ` Russell King (Oracle)
2021-07-09 14:21 ` Ming Lei
2021-07-09 10:26 ` Robin Murphy
2021-07-09 11:04 ` John Garry
2021-07-09 12:34 ` Robin Murphy
2021-07-09 14:24 ` Ming Lei
2021-07-19 16:14 ` John Garry
2021-07-21 1:40 ` Ming Lei
2021-07-21 9:23 ` John Garry
2021-07-21 9:59 ` Ming Lei
2021-07-21 11:07 ` John Garry
2021-07-21 11:58 ` Ming Lei
2021-07-22 7:58 ` Ming Lei
2021-07-22 10:05 ` John Garry
2021-07-22 10:19 ` Ming Lei
2021-07-22 11:12 ` John Garry
2021-07-22 12:53 ` Marc Zyngier [this message]
2021-07-22 13:54 ` John Garry
2021-07-22 15:54 ` Ming Lei
2021-07-22 17:40 ` Robin Murphy
2021-07-23 10:21 ` Ming Lei
2021-07-26 7:51 ` John Garry
2021-07-28 1:32 ` Ming Lei
2021-07-28 10:38 ` John Garry
2021-07-28 15:17 ` Ming Lei
2021-07-28 15:39 ` Robin Murphy
2021-08-10 9:36 ` John Garry
2021-08-10 10:35 ` Ming Lei
2021-07-27 17:08 ` Robin Murphy
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