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From: Dongli Zhang <dongli.zhang@oracle.com>
To: Prasun Ratn <prasun.ratn@gmail.com>, ming.lei@redhat.com
Cc: keith.busch@intel.com, hch@lst.de, sagi@grimberg.me,
	linux-nvme@lists.infradead.org, axboe@fb.com,
	jianchao.w.wang@oracle.com, linux-block@vger.kernel.org,
	tglx@linutronix.de
Subject: Re: nvme-pci: number of queues off by one
Date: Mon, 8 Oct 2018 13:59:05 +0800	[thread overview]
Message-ID: <9c851b95-1c41-2171-40ec-bd47032401fc@oracle.com> (raw)
In-Reply-To: <CAF6hzxwN4S4C37dbdARcW+tgLMRjvHtzOZjFomVQBVntshZ+7w@mail.gmail.com>

I can reproduce with qemu:

# ls /sys/block/nvme*n1/mq/*/cpu_list
/sys/block/nvme0n1/mq/0/cpu_list
/sys/block/nvme0n1/mq/1/cpu_list
/sys/block/nvme0n1/mq/2/cpu_list
/sys/block/nvme0n1/mq/3/cpu_list
/sys/block/nvme0n1/mq/4/cpu_list
/sys/block/nvme0n1/mq/5/cpu_list
/sys/block/nvme0n1/mq/6/cpu_list

Here is the qemu cmdline emulating 8-queue nvme while the VM has 12 cpu:

# qemu-system-x86_64 -m 4096 -smp 12 \
	-kernel /path-to-kernel/linux-4.18.10/arch/x86_64/boot/bzImage \
	-hda /path-to-img/ubuntu1804.qcow2  \
	-append "root=/dev/sda1 init=/sbin/init text" -enable-kvm \
	-net nic -net user,hostfwd=tcp::5022-:22 \
	-device nvme,drive=nvme1,serial=deadbeaf1,num_queues=8 \
	-drive file=/path-to-img/nvme.disk,if=none,id=nvme1

Dongli Zhang


On 10/08/2018 01:05 PM, Prasun Ratn wrote:
> Hi
> 
> I have an NVMe SSD that has 8 hw queues and on older kernels I see all
> 8 show up. However on a recent kernel (I tried 4.18), I only see 7. Is
> this a known issue?
> 
> $ uname -r
> 4.14.1-1.el7.elrepo.x86_64
> 
> $ ls /sys/block/nvme*n1/mq/*/cpu_list
> /sys/block/nvme0n1/mq/0/cpu_list
> /sys/block/nvme0n1/mq/1/cpu_list
> /sys/block/nvme0n1/mq/2/cpu_list
> /sys/block/nvme0n1/mq/3/cpu_list
> /sys/block/nvme0n1/mq/4/cpu_list
> /sys/block/nvme0n1/mq/5/cpu_list
> /sys/block/nvme0n1/mq/6/cpu_list
> /sys/block/nvme0n1/mq/7/cpu_list
> /sys/block/nvme1n1/mq/0/cpu_list
> /sys/block/nvme1n1/mq/1/cpu_list
> /sys/block/nvme1n1/mq/2/cpu_list
> /sys/block/nvme1n1/mq/3/cpu_list
> /sys/block/nvme1n1/mq/4/cpu_list
> /sys/block/nvme1n1/mq/5/cpu_list
> /sys/block/nvme1n1/mq/6/cpu_list
> /sys/block/nvme1n1/mq/7/cpu_list
> /sys/block/nvme2n1/mq/0/cpu_list
> /sys/block/nvme2n1/mq/1/cpu_list
> /sys/block/nvme2n1/mq/2/cpu_list
> /sys/block/nvme2n1/mq/3/cpu_list
> /sys/block/nvme2n1/mq/4/cpu_list
> /sys/block/nvme2n1/mq/5/cpu_list
> /sys/block/nvme2n1/mq/6/cpu_list
> /sys/block/nvme2n1/mq/7/cpu_list
> /sys/block/nvme3n1/mq/0/cpu_list
> /sys/block/nvme3n1/mq/1/cpu_list
> /sys/block/nvme3n1/mq/2/cpu_list
> /sys/block/nvme3n1/mq/3/cpu_list
> /sys/block/nvme3n1/mq/4/cpu_list
> /sys/block/nvme3n1/mq/5/cpu_list
> /sys/block/nvme3n1/mq/6/cpu_list
> /sys/block/nvme3n1/mq/7/cpu_list
> 
> 
> $ uname -r
> 4.18.10-1.el7.elrepo.x86_64
> 
> $ ls /sys/block/nvme*n1/mq/*/cpu_list
> /sys/block/nvme0n1/mq/0/cpu_list
> /sys/block/nvme0n1/mq/1/cpu_list
> /sys/block/nvme0n1/mq/2/cpu_list
> /sys/block/nvme0n1/mq/3/cpu_list
> /sys/block/nvme0n1/mq/4/cpu_list
> /sys/block/nvme0n1/mq/5/cpu_list
> /sys/block/nvme0n1/mq/6/cpu_list
> /sys/block/nvme1n1/mq/0/cpu_list
> /sys/block/nvme1n1/mq/1/cpu_list
> /sys/block/nvme1n1/mq/2/cpu_list
> /sys/block/nvme1n1/mq/3/cpu_list
> /sys/block/nvme1n1/mq/4/cpu_list
> /sys/block/nvme1n1/mq/5/cpu_list
> /sys/block/nvme1n1/mq/6/cpu_list
> /sys/block/nvme2n1/mq/0/cpu_list
> /sys/block/nvme2n1/mq/1/cpu_list
> /sys/block/nvme2n1/mq/2/cpu_list
> /sys/block/nvme2n1/mq/3/cpu_list
> /sys/block/nvme2n1/mq/4/cpu_list
> /sys/block/nvme2n1/mq/5/cpu_list
> /sys/block/nvme2n1/mq/6/cpu_list
> /sys/block/nvme3n1/mq/0/cpu_list
> /sys/block/nvme3n1/mq/1/cpu_list
> /sys/block/nvme3n1/mq/2/cpu_list
> /sys/block/nvme3n1/mq/3/cpu_list
> /sys/block/nvme3n1/mq/4/cpu_list
> /sys/block/nvme3n1/mq/5/cpu_list
> /sys/block/nvme3n1/mq/6/cpu_list
> 

WARNING: multiple messages have this Message-ID (diff)
From: dongli.zhang@oracle.com (Dongli Zhang)
Subject: nvme-pci: number of queues off by one
Date: Mon, 8 Oct 2018 13:59:05 +0800	[thread overview]
Message-ID: <9c851b95-1c41-2171-40ec-bd47032401fc@oracle.com> (raw)
In-Reply-To: <CAF6hzxwN4S4C37dbdARcW+tgLMRjvHtzOZjFomVQBVntshZ+7w@mail.gmail.com>

I can reproduce with qemu:

# ls /sys/block/nvme*n1/mq/*/cpu_list
/sys/block/nvme0n1/mq/0/cpu_list
/sys/block/nvme0n1/mq/1/cpu_list
/sys/block/nvme0n1/mq/2/cpu_list
/sys/block/nvme0n1/mq/3/cpu_list
/sys/block/nvme0n1/mq/4/cpu_list
/sys/block/nvme0n1/mq/5/cpu_list
/sys/block/nvme0n1/mq/6/cpu_list

Here is the qemu cmdline emulating 8-queue nvme while the VM has 12 cpu:

# qemu-system-x86_64 -m 4096 -smp 12 \
	-kernel /path-to-kernel/linux-4.18.10/arch/x86_64/boot/bzImage \
	-hda /path-to-img/ubuntu1804.qcow2  \
	-append "root=/dev/sda1 init=/sbin/init text" -enable-kvm \
	-net nic -net user,hostfwd=tcp::5022-:22 \
	-device nvme,drive=nvme1,serial=deadbeaf1,num_queues=8 \
	-drive file=/path-to-img/nvme.disk,if=none,id=nvme1

Dongli Zhang


On 10/08/2018 01:05 PM, Prasun Ratn wrote:
> Hi
> 
> I have an NVMe SSD that has 8 hw queues and on older kernels I see all
> 8 show up. However on a recent kernel (I tried 4.18), I only see 7. Is
> this a known issue?
> 
> $ uname -r
> 4.14.1-1.el7.elrepo.x86_64
> 
> $ ls /sys/block/nvme*n1/mq/*/cpu_list
> /sys/block/nvme0n1/mq/0/cpu_list
> /sys/block/nvme0n1/mq/1/cpu_list
> /sys/block/nvme0n1/mq/2/cpu_list
> /sys/block/nvme0n1/mq/3/cpu_list
> /sys/block/nvme0n1/mq/4/cpu_list
> /sys/block/nvme0n1/mq/5/cpu_list
> /sys/block/nvme0n1/mq/6/cpu_list
> /sys/block/nvme0n1/mq/7/cpu_list
> /sys/block/nvme1n1/mq/0/cpu_list
> /sys/block/nvme1n1/mq/1/cpu_list
> /sys/block/nvme1n1/mq/2/cpu_list
> /sys/block/nvme1n1/mq/3/cpu_list
> /sys/block/nvme1n1/mq/4/cpu_list
> /sys/block/nvme1n1/mq/5/cpu_list
> /sys/block/nvme1n1/mq/6/cpu_list
> /sys/block/nvme1n1/mq/7/cpu_list
> /sys/block/nvme2n1/mq/0/cpu_list
> /sys/block/nvme2n1/mq/1/cpu_list
> /sys/block/nvme2n1/mq/2/cpu_list
> /sys/block/nvme2n1/mq/3/cpu_list
> /sys/block/nvme2n1/mq/4/cpu_list
> /sys/block/nvme2n1/mq/5/cpu_list
> /sys/block/nvme2n1/mq/6/cpu_list
> /sys/block/nvme2n1/mq/7/cpu_list
> /sys/block/nvme3n1/mq/0/cpu_list
> /sys/block/nvme3n1/mq/1/cpu_list
> /sys/block/nvme3n1/mq/2/cpu_list
> /sys/block/nvme3n1/mq/3/cpu_list
> /sys/block/nvme3n1/mq/4/cpu_list
> /sys/block/nvme3n1/mq/5/cpu_list
> /sys/block/nvme3n1/mq/6/cpu_list
> /sys/block/nvme3n1/mq/7/cpu_list
> 
> 
> $ uname -r
> 4.18.10-1.el7.elrepo.x86_64
> 
> $ ls /sys/block/nvme*n1/mq/*/cpu_list
> /sys/block/nvme0n1/mq/0/cpu_list
> /sys/block/nvme0n1/mq/1/cpu_list
> /sys/block/nvme0n1/mq/2/cpu_list
> /sys/block/nvme0n1/mq/3/cpu_list
> /sys/block/nvme0n1/mq/4/cpu_list
> /sys/block/nvme0n1/mq/5/cpu_list
> /sys/block/nvme0n1/mq/6/cpu_list
> /sys/block/nvme1n1/mq/0/cpu_list
> /sys/block/nvme1n1/mq/1/cpu_list
> /sys/block/nvme1n1/mq/2/cpu_list
> /sys/block/nvme1n1/mq/3/cpu_list
> /sys/block/nvme1n1/mq/4/cpu_list
> /sys/block/nvme1n1/mq/5/cpu_list
> /sys/block/nvme1n1/mq/6/cpu_list
> /sys/block/nvme2n1/mq/0/cpu_list
> /sys/block/nvme2n1/mq/1/cpu_list
> /sys/block/nvme2n1/mq/2/cpu_list
> /sys/block/nvme2n1/mq/3/cpu_list
> /sys/block/nvme2n1/mq/4/cpu_list
> /sys/block/nvme2n1/mq/5/cpu_list
> /sys/block/nvme2n1/mq/6/cpu_list
> /sys/block/nvme3n1/mq/0/cpu_list
> /sys/block/nvme3n1/mq/1/cpu_list
> /sys/block/nvme3n1/mq/2/cpu_list
> /sys/block/nvme3n1/mq/3/cpu_list
> /sys/block/nvme3n1/mq/4/cpu_list
> /sys/block/nvme3n1/mq/5/cpu_list
> /sys/block/nvme3n1/mq/6/cpu_list
> 

  reply	other threads:[~2018-10-08 13:07 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 15:48 [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0 Jianchao Wang
2018-02-28 15:48 ` Jianchao Wang
2018-02-28 15:59 ` Andy Shevchenko
2018-02-28 15:59   ` Andy Shevchenko
2018-03-02  3:06   ` jianchao.wang
2018-03-02  3:06     ` jianchao.wang
2018-03-12 18:59     ` Keith Busch
2018-03-12 18:59       ` Keith Busch
2018-03-13  1:47       ` jianchao.wang
2018-03-13  1:47         ` jianchao.wang
2018-02-28 16:47 ` Christoph Hellwig
2018-02-28 16:47   ` Christoph Hellwig
2018-03-01  9:28   ` Sagi Grimberg
2018-03-01  9:28     ` Sagi Grimberg
2018-03-01 10:05     ` jianchao.wang
2018-03-01 10:05       ` jianchao.wang
2018-03-01 15:15       ` Keith Busch
2018-03-01 15:15         ` Keith Busch
2018-03-02  3:11         ` jianchao.wang
2018-03-02  3:11           ` jianchao.wang
2018-03-01 15:03   ` Ming Lei
2018-03-01 15:03     ` Ming Lei
2018-03-01 16:10     ` Keith Busch
2018-03-01 16:10       ` Keith Busch
2018-03-08  7:42       ` Christoph Hellwig
2018-03-08  7:42         ` Christoph Hellwig
2018-03-09 17:24         ` Keith Busch
2018-03-09 17:24           ` Keith Busch
2018-03-12  9:09           ` Ming Lei
2018-03-12  9:09             ` Ming Lei
2018-10-08  5:05             ` nvme-pci: number of queues off by one Prasun Ratn
2018-10-08  5:59               ` Dongli Zhang [this message]
2018-10-08  5:59                 ` Dongli Zhang
2018-10-08  6:58                 ` Dongli Zhang
2018-10-08  6:58                   ` Dongli Zhang
2018-10-08 14:54                   ` Keith Busch
2018-10-08 14:54                     ` Keith Busch
2018-10-08 10:19                 ` Ming Lei
2018-10-08 10:19                   ` Ming Lei
2018-03-02  3:18   ` [PATCH V2] nvme-pci: assign separate irq vectors for adminq and ioq0 jianchao.wang
2018-03-02  3:18     ` jianchao.wang

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