linux-kernel - Re: [PATCH v2 0/3] Add NUMA support for NVDIMM devices

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Date:	Wed, 10 Jun 2015 12:11:45 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Toshi Kani <toshi.kani@...com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>
Subject: Re: [PATCH v2 0/3] Add NUMA support for NVDIMM devices

Dan Williams <dan.j.williams@...el.com> writes:

> On Wed, Jun 10, 2015 at 8:54 AM, Jeff Moyer <jmoyer@...hat.com> wrote:
>> Toshi Kani <toshi.kani@...com> writes:
>>
>>> Since NVDIMMs are installed on memory slots, they expose the NUMA
>>> topology of a platform.  This patchset adds support of sysfs
>>> 'numa_node' to I/O-related NVDIMM devices under /sys/bus/nd/devices.
>>> This enables numactl(8) to accept 'block:' and 'file:' paths of
>>> pmem and btt devices as shown in the examples below.
>>>   numactl --preferred block:pmem0 --show
>>>   numactl --preferred file:/dev/pmem0s --show
>>>
>>> numactl can be used to bind an application to the locality of
>>> a target NVDIMM for better performance.  Here is a result of fio
>>> benchmark to ext4/dax on an HP DL380 with 2 sockets for local and
>>> remote settings.
>>>
>>>   Local [1] :  4098.3MB/s
>>>   Remote [2]:  3718.4MB/s
>>>
>>> [1] numactl --preferred block:pmem0 --cpunodebind block:pmem0 fio <fs-on-pmem0>
>>> [2] numactl --preferred block:pmem1 --cpunodebind block:pmem1 fio <fs-on-pmem0>
>>
>> Did you post the patches to numactl somewhere?
>>
>
> numactl already supports this today.

Ah, I did not know that.  I guess I should have RTFM.  :)

Cheers,
Jeff
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