Re: [Resend RFC PATCH V2 10/12] HV/IOMMU: Add Hyper-V dma ops support

[Lu Baolu]

On 5/13/21 12:01 AM, Tianyu Lan wrote:
> Hi Christoph and Konrad:
>       Current Swiotlb bounce buffer uses a pool for all devices. There
> is a high overhead to get or free bounce buffer during performance test.
> Swiotlb code now use a global spin lock to protect bounce buffer data.
> Several device queues try to acquire the spin lock and this introduce
> additional overhead.
>
> For performance and security perspective, each devices should have a
> separate swiotlb bounce buffer pool and so this part needs to rework.
> I want to check this is right way to resolve performance issues with 
> swiotlb bounce buffer. If you have some other suggestions,welcome.

Is this what you want?

https://lore.kernel.org/linux-iommu/20210510095026.3477496-1-tientzu@xxxxxxxxxxxx/

Best regards,
baolu