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From: Ming Lei <ming.lei@redhat.com>
To: John Garry <john.garry@huawei.com>
Cc: 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 15:58:04 +0800	[thread overview]
Message-ID: <YPklDMng1hL3bQ+v@T590> (raw)
In-Reply-To: <a2650064-41cf-cb62-7ab4-d14ef1856966@huawei.com>

On Wed, Jul 21, 2021 at 12:07:22PM +0100, John Garry wrote:
> On 21/07/2021 10:59, Ming Lei wrote:
> > > I have now removed that from the tree, so please re-pull.
> > Now the kernel can be built successfully, but not see obvious improvement
> > on the reported issue:
> > 
> > [root@ampere-mtjade-04 ~]# uname -a
> > Linux ampere-mtjade-04.khw4.lab.eng.bos.redhat.com 5.14.0-rc2_smmu_fix+ #2 SMP Wed Jul 21 05:49:03 EDT 2021 aarch64 aarch64 aarch64 GNU/Linux
> > 
> > [root@ampere-mtjade-04 ~]# taskset -c 0 ~/git/tools/test/nvme/io_uring 10 1 /dev/nvme1n1 4k
> > + fio --bs=4k --ioengine=io_uring --fixedbufs --registerfiles --hipri --iodepth=64 --iodepth_batch_submit=16 --iodepth_batch_complete_min=16 --filename=/dev/nvme1n1 --direct=1 --runtime=10 --numjobs=1 --rw=randread --name=test --group_reporting
> > test: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=64
> > fio-3.27
> > Starting 1 process
> > Jobs: 1 (f=1): [r(1)][100.0%][r=1503MiB/s][r=385k IOPS][eta 00m:00s]
> > test: (groupid=0, jobs=1): err= 0: pid=3143: Wed Jul 21 05:58:14 2021
> >    read: IOPS=384k, BW=1501MiB/s (1573MB/s)(14.7GiB/10001msec)
> 
> I am not sure what baseline you used previously, but you were getting 327K
> then, so at least this would be an improvement.

Looks the improvement isn't from your patches, please see the test result on
v5.14-rc2:

[root@ampere-mtjade-04 ~]# uname -a
Linux ampere-mtjade-04.khw4.lab.eng.bos.redhat.com 5.14.0-rc2_linus #3 SMP Thu Jul 22 03:41:24 EDT 2021 aarch64 aarch64 aarch64 GNU/Linux
[root@ampere-mtjade-04 ~]# taskset -c 0 ~/git/tools/test/nvme/io_uring 20 1 /dev/nvme1n1 4k
+ fio --bs=4k --ioengine=io_uring --fixedbufs --registerfiles --hipri --iodepth=64 --iodepth_batch_submit=16 --iodepth_batch_complete_min=16 --filename=/dev/nvme1n1 --direct=1 --runtime=20 --numjobs=1 --rw=randread --name=test --group_reporting
test: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=64
fio-3.27
Starting 1 process
Jobs: 1 (f=1): [r(1)][100.0%][r=1489MiB/s][r=381k IOPS][eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=3099: Thu Jul 22 03:53:04 2021
  read: IOPS=381k, BW=1487MiB/s (1559MB/s)(29.0GiB/20001msec)


thanks, 
Ming


  parent reply	other threads:[~2021-07-22  7:58 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 [this message]
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
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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