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

Jeff Moyer
2015-06-10T16:11:45Z

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

> 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.

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

Cheers,
Jeff