We came across a very strange issues, I have two VMs connected with the same network on a host. Both VMS are connected via PIF to the network on XenServer. Now if i transfer one large file to the second VM with lower limit of QoS on VIF ( i.e VMs can transfer data at 200 Mbps but we have set QoS 20 Mpbs), it causes a high soft interrupts (ksoftirqd/0). Due to these high IRQs impacts on the storage performance badly.
If i increased the value of QoS on VIF ( i.e we have set QoS more then 200 Mbps ), it doesn't impact anything, no soft interrupts no loads i can see.
Network QoS are meant to be controlled the traffic but it should not impact the performance of underlying hypervisor. This issues are reproducible.
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Vivek kumar1709157130
Hello Folks..!!
We came across a very strange issues, I have two VMs connected with the same network on a host. Both VMS are connected via PIF to the network on XenServer. Now if i transfer one large file to the second VM with lower limit of QoS on VIF ( i.e VMs can transfer data at 200 Mbps but we have set QoS 20 Mpbs), it causes a high soft interrupts (ksoftirqd/0). Due to these high IRQs impacts on the storage performance badly.
If i increased the value of QoS on VIF ( i.e we have set QoS more then 200 Mbps ), it doesn't impact anything, no soft interrupts no loads i can see.
Network QoS are meant to be controlled the traffic but it should not impact the performance of underlying hypervisor. This issues are reproducible.
I am using XenServer 7.0.
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