Hi Pavel, On 2/5/24 18:35, Pavel Hofman wrote: > >> > It really looks like some DMA performance issue. Stream 980 bytes/ 250us > (bInterval=2) is bitperfect, no dropped packets. While 24 bytes/125us > (bInterval=1) gets stuck. IIUC the DMA is not capable of copying packets > every 125us. Please is there any chance to tweak the performance to > handle the 125us packets reliably? > > Thanks a lot! Quick analysis. 1. In dmesg seen BNA (buffer not available) interrupt which mean driver not prepare DMA descriptor on time. 2. For a try please disable debug printing from g_audio: [ 2080.107701] u_audio_iso_complete: iso_complete status(-61) 0/1000 3. Please try run device in Buffer DMA instead of Descriptor DMA: p->g_dma_desc = hw->dma_desc_enable; replace to: p->g_dma_desc = 0; Thanks, Minas
