On Wed, 14 Aug 2024 09:59:13 -0700 Erni Sri Satya Vennela wrote: > Change VMBus channels macro (VRSS_CHANNEL_DEFAULT) in > Linux netvsc from 8 to 16 to align with Azure Windows VM > and improve networking throughput. > > For VMs having less than 16 vCPUS, the channels depend > on number of vCPUs. Between 16 to 32 vCPUs, the channels > default to VRSS_CHANNEL_DEFAULT. For greater than 32 vCPUs, > set the channels to number of physical cores / 2 as a way > to optimize CPU resource utilization and scale for high-end > processors with many cores. > Maximum number of channels are by default set to 64. > > Based on this change the subchannel creation would change as follows: > > ------------------------------------------------------------- > |No. of vCPU |dev_info->num_chn |subchannel created | > ------------------------------------------------------------- > | 0-16 | 16 | vCPU | > | >16 & <=32 | 16 | 16 | > | >32 & <=128 | vCPU/2 | vCPU/2 | > | >128 | vCPU/2 | 64 | > ------------------------------------------------------------- > > Performance tests showed significant improvement in throughput: > - 0.54% for 16 vCPUs > - 0.83% for 32 vCPUs > - 1.76% for 48 vCPUs > - 10.35% for 64 vCPUs > - 13.47% for 96 vCPUs Is there anything that needs clarifying in my feedback on v1? https://lore.kernel.org/all/20240807201857.445f9f95@xxxxxxxxxx/ Ignoring maintainer feedback is known to result in angry outbursts.
