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

Dan Williams
2015-06-10T15:57:50Z

On Wed, Jun 10, 2015 at 8:54 AM, Jeff Moyer <jmoyer@redhat.com> wrote:
> Toshi Kani <toshi.kani@hp.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.