Increase default VMBus channels in Linux netvsc from 8 to 16
to align with Azure Windows VM and improve networking throughput.
Set channels to 16 for VMs with more than 16 vCPUs;
otherwise, channels depend on VM's vCPU count.
Performance tests showed significant improvement in throughput:
- 0.54% for 16 vCPUs
- 1.51% for 32 vCPUs
- 0.72% for 48 vCPUs
- 5.57% for 64 vCPUs
- 9.14% for 96 vCPUs
Signed-off-by: Erni Sri Satya Vennela <ernis@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Shradha Gupta <shradhagupta@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/hyperv/hyperv_net.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 810977952f95..e690b95b1bbb 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -882,7 +882,7 @@ struct nvsp_message {
#define VRSS_SEND_TAB_SIZE 16 /* must be power of 2 */
#define VRSS_CHANNEL_MAX 64
-#define VRSS_CHANNEL_DEFAULT 8
+#define VRSS_CHANNEL_DEFAULT 16
#define RNDIS_MAX_PKT_DEFAULT 8
#define RNDIS_PKT_ALIGN_DEFAULT 8
--
2.25.1
