.NET Core, BenchmarkDotNet: for vs foreach performance

mkdir benchmark.for

cd benchmark.for
dotnet new console

dotnet add package BenchmarkDotNet -v 0.11.0
dotnet restore

using System;
using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace benchmark
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Use BenchmarkRunner.Run to Benchmark your code
            var summary = BenchmarkRunner.Run<ForEachVsFor>();
        }
    }

    // We are using .Net Core we are adding the CoreJobAttribute here.
    [CoreJob(baseline: true)]
    [RPlotExporter, RankColumn]
    public class ForEachVsFor
    {
        private static Random random = new Random();
        private List<int> list;

        public static List<int> RandomIntList(int length)
        {
            int Min = 1;
            int Max = 10;
            return Enumerable
                .Repeat(0, length)
                .Select(i => random.Next(Min, Max))
                .ToList();
        }

        // We wil run the the test for 3 diff list sizes
        [Params(10, 100, 1000)]
        public int N;

        [GlobalSetup]
        public void Setup()
        {
            list = RandomIntList(N);
        }

        // Foreach is ~2 times slower than for
        [Benchmark]
        public void Foreach()
        {
            int total = 0;
            foreach (int i in list)
            {
                total += i;
            }
        }

        // For is ~2 times faster than foreach
        [Benchmark]
        public void For()
        {
            int total = 0;
            for (int i = 0; i < list.Count; i++)
            {
                total += list[i];
            }
        }
    }
}

dotnet run -c release

// * Summary *

BenchmarkDotNet=v0.11.0, OS=Windows 10.0.17134.228 (1803/April2018Update/Redstone4)
Intel Core i5-6300U CPU 2.40GHz (Skylake), 1 CPU, 4 logical and 2 physical cores
Frequency=2437501 Hz, Resolution=410.2562 ns, Timer=TSC
.NET Core SDK=2.1.302
  [Host] : .NET Core 2.1.2 (CoreCLR 4.6.26628.05, CoreFX 4.6.26629.01), 64bit RyuJIT
  Core   : .NET Core 2.1.2 (CoreCLR 4.6.26628.05, CoreFX 4.6.26629.01), 64bit RyuJIT

Job=Core  Runtime=Core

  Method |    N |        Mean |      Error |      StdDev |      Median | Scaled | Rank |
-------- |----- |------------:|-----------:|------------:|------------:|-------:|-----:|
 Foreach |   10 |    45.76 ns |  3.0062 ns |   8.8167 ns |    43.15 ns |   1.00 |    1 |
         |      |             |            |             |             |        |      |
     For |   10 |    18.14 ns |  0.4040 ns |   0.3968 ns |    18.04 ns |   1.00 |    1 |
         |      |             |            |             |             |        |      |
 Foreach |  100 |   503.16 ns |  9.9973 ns |  24.8968 ns |   501.49 ns |   1.00 |    1 |
         |      |             |            |             |             |        |      |
     For |  100 |   149.56 ns |  3.6317 ns |  10.1238 ns |   147.41 ns |   1.00 |    1 |
         |      |             |            |             |             |        |      |
 Foreach | 1000 | 2,611.51 ns | 51.7677 ns | 122.0225 ns | 2,596.29 ns |   1.00 |    1 |
         |      |             |            |             |             |        |      |
     For | 1000 | 1,406.77 ns | 28.3726 ns |  82.3140 ns | 1,391.04 ns |   1.00 |    1 |