t;> To: Song Bao Hua (Barry Song)
>>> Cc: robin.mur...@arm.com; h...@lst.de; m.szyprow...@samsung.com;
>>> iommu@lists.linux-foundation.org; linux-arm-ker...@lists.infradead.org;
>>> Linuxarm
>>> Subject: Re: [PATCH] iommu/arm-smmu-v3: expose numa_node a
n.mur...@arm.com; h...@lst.de; m.szyprow...@samsung.com;
> > iommu@lists.linux-foundation.org; linux-arm-ker...@lists.infradead.org;
> > Linuxarm
> > Subject: Re: [PATCH] iommu/arm-smmu-v3: expose numa_node attribute to
> > users in sysfs
> >
> > On Sat, May 30, 2
ists.infradead.org;
> Linuxarm
> Subject: Re: [PATCH] iommu/arm-smmu-v3: expose numa_node attribute to
> users in sysfs
>
> On Sat, May 30, 2020 at 09:15:05PM +1200, Barry Song wrote:
> > As tests show the latency of dma_unmap can increase dramatically while
> > calling them cr
On Sat, May 30, 2020 at 09:15:05PM +1200, Barry Song wrote:
> As tests show the latency of dma_unmap can increase dramatically while
> calling them cross NUMA nodes, especially cross CPU packages, eg.
> 300ns vs 800ns while waiting for the completion of CMD_SYNC in an
> empty command queue. The
rm ; linux-arm-ker...@lists.infradead.org
> Subject: Re: [PATCH] iommu/arm-smmu-v3: expose numa_node attribute to
> users in sysfs
>
> On 2020-05-30 10:15, Barry Song wrote:
> > As tests show the latency of dma_unmap can increase dramatically while
> > calling them cross NUMA nodes, especially
On 2020-05-30 10:15, Barry Song wrote:
As tests show the latency of dma_unmap can increase dramatically while
calling them cross NUMA nodes, especially cross CPU packages, eg.
300ns vs 800ns while waiting for the completion of CMD_SYNC in an
empty command queue. The large latency causing by
As tests show the latency of dma_unmap can increase dramatically while
calling them cross NUMA nodes, especially cross CPU packages, eg.
300ns vs 800ns while waiting for the completion of CMD_SYNC in an
empty command queue. The large latency causing by remote node will
in turn make contention of
