Re: [Xen-devel] Interesting observation with network event notification and batching

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jun 14, 2013 at 02:53:03PM -0400, Konrad Rzeszutek Wilk wrote:
[...]> 
> How do you get it to do more HYPERVISR_xen_version? Did you just add
> a (for i = 1024; i>0;i--) hypervisor_yield();
> 

Here are the figures to replace HYPERVISOR_xen_version(0, NULL) with
HYPERVISOR_sched_op(SCHEDOP_yield, NULL).

64 HYPERVISOR_sched_op(SCHEDOP_yield, NULL), throughput 5.15G/s,
average slots per tx 25

128 HYPERVISOR_sched_op(SCHEDOP_yield, NULL), throughput 7.75G/s,
average slots per tx 26

512 HYPERVISOR_sched_op(SCHEDOP_yield, NULL), throughput 1.74G/s,
average slots per tx 18

1024 HYPERVISOR_sched_op(SCHEDOP_yield, NULL), throughput 998M/s,
average slots per tx 18

Please note that Dom0 and DomU runs on different PCPUs.

I think this kind of behavior has something to do with scheduler. But
down to the bottom we should really fix notification mechanism.


Wei.

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