Re: [PATCH v7 0/3] dma-mapping: benchmark: Add support for dma_map_sg

[Barry Song]

On Wed, Feb 25, 2026 at 5:38 PM Qinxin Xia <xiaqinxin@xxxxxxxxxx> wrote:
>
> Modify the framework to adapt to more map modes, add benchmark
> support for dma_map_sg, and add support sg map mode in ioctl.
>
> The result:
> [root@localhost]# ./dma_map_benchmark -m 1 -g 8 -t 8 -s 30 -d 2
> dma mapping benchmark(SG_MODE): threads:8 seconds:30 node:-1 dir:FROM_DEVICE granule/sg_nents: 8
> average map latency(us):1.4 standard deviation:0.3
> average unmap latency(us):1.3 standard deviation:0.3
> [root@localhost]# ./dma_map_benchmark -m 0 -g 8 -t 8 -s 30 -d 2
> dma mapping benchmark(SINGLE_MODE): threads:8 seconds:30 node:-1 dir:FROM_DEVICE granule/sg_nents: 8
> average map latency(us):1.0 standard deviation:0.3
> average unmap latency(us):1.3 standard deviation:0.5
>

+ Marek,

Hi Marek,

Would you be willing to pick up Qinxin's series into the dma-mapping
tree? I think that would be helpful, at least for my
"dma-mapping: arm64: support batched cache sync" series[1] and for
potential further optimizations to dma_map_sg().

[1] https://lore.kernel.org/lkml/20251226225254.46197-1-21cnbao@xxxxxxxxx/


Thanks
Barry