Re: [Qemu-devel] Performance Profiling 2 VMs

[Stefan Hajnoczi]

On Wed, Mar 02, 2016 at 09:32:30PM -0800, kalyan tata wrote:
> Thanks a lot for the quick reply Stefan
> 
> Following from problem VM:
> 18:56:29     CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal
> %idle    intr/s
> 
> 18:56:44       1    0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  100.20      0.00
> 18:56:49       1    0.00    0.00    0.00    0.00    3.21   10.22    0.00
> 79.56    908.22
> 18:56:54       1    0.00    0.00    0.00    0.00   11.47   54.93    0.00
>  2.82   5527.77
> 18:56:59       1    0.00    0.00    0.00    0.00   10.04   66.06    0.00
>  2.21   7160.64
> 18:57:04       1    0.00    0.00    0.00    0.00   10.42   65.13    0.00
>  2.00   7295.99
> 18:57:09       1    0.00    0.00    0.00    0.00   12.53   50.51    0.00
>  4.04   5700.20
> 18:57:14       1    0.00    0.00    0.00    0.00   16.43   65.53    0.00
>  8.62   9572.34
> 18:57:19       1    0.00    0.00    0.00    0.00   11.45   60.64    0.00
>  4.02   5798.19
> 18:57:24       1    0.00    0.00    0.00    0.00   11.45   81.33    0.00
>  0.80   6064.26
> 18:57:29       1    0.00    0.00    0.00    0.00    7.65   85.11    0.00
>  0.80   7578.27
> 18:57:34       1    0.00    0.00    0.00    0.00    9.42   84.17    0.00
>  1.40   9083.97
> 18:57:39       1    0.00    0.00    0.00    0.00    7.78   82.83    0.00
>  1.60   7264.87
> 18:57:44       1    0.00    0.00    0.00    0.00    8.62   87.78    0.00
>  0.60   8597.80
> 18:57:49       1    0.00    0.00    0.00    0.00   10.02   82.16    0.00
>  2.40   7750.90
> 18:57:54       1    0.00    0.00    0.00    0.00    8.42   81.76    0.00
>  1.00   6303.41
> 18:57:59       1    0.00    0.00    0.00    0.00    7.63   87.35    0.00
>  1.20   9422.49
> 18:58:04       1    0.00    0.00    0.00    0.00   10.44   80.32    0.00
>  2.21   7496.79
> 18:58:09       1    0.00    0.00    0.00    0.00    6.43   59.84    0.00
> 26.91   5019.28
> 18:58:14       1    0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  100.00      1.00
> 18:58:19       1    0.00    0.00    0.00    0.00    0.00    0.00    0.00
>  100.00      0.00
> 
> I set the affinity of both tx and rx interfaces to cpu 1 so just showing
> cpu1.
> 
> NAPI weight is 128 in this version, I changed to 64 just to see. This
> version of the code seems to be changing quota and budget (which i did not
> see in newer versions) I am thinking of playing around with that.
> I also see that this version kicks for every packet on the tx side.

There is nothing surprising in the output.  It makes sense for a
CPU-bound virtual networking workload.

Perhaps someone else has ideas.

Stefan

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