search for: vhost_dma_urgent

Below should be useful for some experiments Jason is doing. I thought I'd send it out for early review/feedback. Compiled-only at this point. event idx feature allows us to defer interrupts until a specific # of descriptors were used. Sometimes it might be useful to get an interrupt after a specific descriptor, regardless. This adds a descriptor flag for this, and an API to create an urgent

Below should be useful for some experiments Jason is doing. I thought I'd send it out for early review/feedback. Compiled-only at this point. event idx feature allows us to defer interrupts until a specific # of descriptors were used. Sometimes it might be useful to get an interrupt after a specific descriptor, regardless. This adds a descriptor flag for this, and an API to create an urgent

...* status internally; used for zerocopy tx only. */ /* Lower device DMA failed */ -#define VHOST_DMA_FAILED_LEN 3 +#define VHOST_DMA_FAILED_LEN 4 /* Lower device DMA done */ -#define VHOST_DMA_DONE_LEN 2 +#define VHOST_DMA_DONE_LEN 3 +/* Lower device DMA in progress, urgent bit set */ +#define VHOST_DMA_URGENT 2 /* Lower device DMA in progress */ #define VHOST_DMA_IN_PROGRESS 1 /* Buffer unused */ @@ -284,11 +286,13 @@ static void vhost_zerocopy_signal_used(struct vhost_net *net, container_of(vq, struct vhost_net_virtqueue, vq); int i, add; int j = 0; + bool urgent = false; for (i = nvq-&gt...

Hello all: We free old transmitted packets in ndo_start_xmit() currently, so any packet must be orphaned also there. This was used to reduce the overhead of tx interrupt to achieve better performance. But this may not work for some protocols such as TCP stream. TCP depends on the value of sk_wmem_alloc to implement various optimization for small packets stream such as TCP small queue and auto

Hello all: We free old transmitted packets in ndo_start_xmit() currently, so any packet must be orphaned also there. This was used to reduce the overhead of tx interrupt to achieve better performance. But this may not work for some protocols such as TCP stream. TCP depends on the value of sk_wmem_alloc to implement various optimization for small packets stream such as TCP small queue and auto