2014-09-24 18:40:53 UTC
I found this interesting project from KVM TODO website:
allow handling short packets from softirq or VCPU context
We are going through the scheduler 3 times
(could be up to 5 if softirqd is involved)
Consider RX: host irq -> io thread -> VCPU thread ->
guest irq -> guest thread.
This adds a lot of latency.
We can cut it by some 1.5x if we do a bit of work
either in the VCPU or softirq context.
Testing: netperf TCP RR - should be improved drastically
netperf TCP STREAM guest to host - no regression
Would you mind saying more about the work either in the vCPU or
softirq context? Why it is only for short packets handling? Thanks a
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