RE: DMA restriction and NUMA node number

2021-07-13 Thread Wei Chen
Hi Jan, > -Original Message- > From: Jan Beulich > Sent: 2021年7月13日 18:21 > To: Julien Grall ; Wei Chen > Cc: Penny Zheng ; Bertrand Marquis > ; xen-de...@lists.xen.org; Roger Pau Monné > ; Stefano Stabellini ; > Andrew Cooper > Subject: Re: DMA restriction

Re: DMA restriction and NUMA node number

2021-07-13 Thread Jan Beulich
On 13.07.2021 11:26, Julien Grall wrote: > On 13/07/2021 04:19, Wei Chen wrote: >> I am doing some NUMA testing on Xen. And I find the DMA restriction is >> based on NUMA node number [1]. >> if ( !dma_bitsize && (num_online_nodes() > 1) ) >> dma_bitsize = arch_get_dma_bitsize(); >> >>

Re: DMA restriction and NUMA node number

2021-07-13 Thread Julien Grall
(+Andrew, Jan, Roger) On 13/07/2021 04:19, Wei Chen wrote: Hi, I am doing some NUMA testing on Xen. And I find the DMA restriction is based on NUMA node number [1]. if ( !dma_bitsize && (num_online_nodes() > 1) ) dma_bitsize = arch_get_dma_bitsize(); On Arm64, we will set dma_bit