Re: [PATCH] vhost: Make it more scalable by creating a vhost thread per device.

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Here are the results with netperf TCP_STREAM 64K guest to host on a
8-cpu Nehalem system.

I presume you mean 8 core Nehalem-EP, or did you mean 8 processor Nehalem-EX?

Don't get me wrong, I *like* the netperf 64K TCP_STREAM test, I lik it a lot!-) but I find it incomplete and also like to run things like single-instance TCP_RR and multiple-instance, multiple "transaction" (./configure --enable-burst) TCP_RR tests, particularly when concerned with "scaling" issues.

happy benchmarking,

rick jones

It shows cumulative bandwidth in Mbps and host CPU utilization.

Current default single vhost thread
-----------------------------------
1 guest: 12500 37% 2 guests: 12800 46%
3 guests: 12600  47%
4 guests: 12200  47%
5 guests: 12000  47%
6 guests: 11700  47%
7 guests: 11340  47%
8 guests: 11200  48%

vhost thread per cpu
--------------------
1 guest:   4900 25%
2 guests: 10800 49%
3 guests: 17100 67%
4 guests: 20400 84%
5 guests: 21000 90%
6 guests: 22500 92%
7 guests: 23500 96%
8 guests: 24500 99%

vhost thread per guest interface
--------------------------------
1 guest:  12500 37%
2 guests: 21000 72%
3 guests: 21600 79%
4 guests: 21600 85%
5 guests: 22500 89%
6 guests: 22800 94%
7 guests: 24500 98%
8 guests: 26400 99%

Thanks
Sridhar


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