perf(virtio): use weaker memory barriers from the mem-barrier crate

[mkroening]

This PR replaces the kernel-internal mandatory memory_barrier with weaker memory barriers from the new mem-barriers crate.

This will probably not make a big difference, but this should be an improvement.

What I also noticed is that for packed virtqueues, we currently don't have any memory barriers at all, which should be fixed in the future. For split virtqueues, I think we also have too few at the moment.

[github-actions]

Benchmark Results

Benchmark	Current: 4299cb6	Previous: befcf26	Performance Ratio
startup_benchmark Build Time	116.74 s	111.11 s	1.05
startup_benchmark File Size	0.87 MB	0.87 MB	1.00
Startup Time - 1 core	1.02 s (±0.02 s)	0.98 s (±0.02 s)	1.04
Startup Time - 2 cores	1.01 s (±0.03 s)	0.99 s (±0.03 s)	1.01
Startup Time - 4 cores	1.00 s (±0.03 s)	0.99 s (±0.02 s)	1.01
multithreaded_benchmark Build Time	116.63 s	111.66 s	1.04
multithreaded_benchmark File Size	0.97 MB	0.97 MB	1.00
Multithreaded Pi Efficiency - 2 Threads	93.17 % (±8.19 %)	87.45 % (±8.10 %)	1.07
Multithreaded Pi Efficiency - 4 Threads	44.74 % (±2.94 %)	42.77 % (±3.00 %)	1.05
Multithreaded Pi Efficiency - 8 Threads	25.66 % (±1.52 %)	25.18 % (±1.60 %)	1.02
micro_benchmarks Build Time	300.82 s	296.75 s	1.01
micro_benchmarks File Size	0.98 MB	0.98 MB	1.00
Scheduling time - 1 thread	180.88 ticks (±32.99 ticks)	176.35 ticks (±34.79 ticks)	1.03
Scheduling time - 2 threads	100.91 ticks (±19.37 ticks)	104.10 ticks (±21.43 ticks)	0.97
Micro - Time for syscall (getpid)	11.38 ticks (±4.59 ticks)	11.69 ticks (±5.33 ticks)	0.97
Memcpy speed - (built_in) block size 4096	56883.92 MByte/s (±41662.81 MByte/s)	61256.19 MByte/s (±45369.75 MByte/s)	0.93
Memcpy speed - (built_in) block size 1048576	14792.56 MByte/s (±12874.46 MByte/s)	14154.64 MByte/s (±11768.17 MByte/s)	1.05
Memcpy speed - (built_in) block size 16777216	9290.99 MByte/s (±7457.02 MByte/s)	9650.18 MByte/s (±7829.51 MByte/s)	0.96
Memset speed - (built_in) block size 4096	57150.54 MByte/s (±41824.50 MByte/s)	62658.40 MByte/s (±45879.30 MByte/s)	0.91
Memset speed - (built_in) block size 1048576	15064.46 MByte/s (±12983.79 MByte/s)	14567.64 MByte/s (±12031.17 MByte/s)	1.03
Memset speed - (built_in) block size 16777216	9511.80 MByte/s (±7586.08 MByte/s)	9902.13 MByte/s (±7993.63 MByte/s)	0.96
Memcpy speed - (rust) block size 4096	52416.85 MByte/s (±38777.31 MByte/s)	55637.12 MByte/s (±41593.40 MByte/s)	0.94
Memcpy speed - (rust) block size 1048576	13697.10 MByte/s (±11164.80 MByte/s)	13921.96 MByte/s (±11517.33 MByte/s)	0.98
Memcpy speed - (rust) block size 16777216	9552.87 MByte/s (±7716.97 MByte/s)	9776.63 MByte/s (±7947.05 MByte/s)	0.98
Memset speed - (rust) block size 4096	53016.95 MByte/s (±39192.55 MByte/s)	56255.41 MByte/s (±41950.49 MByte/s)	0.94
Memset speed - (rust) block size 1048576	14026.00 MByte/s (±11349.89 MByte/s)	14238.58 MByte/s (±11680.58 MByte/s)	0.99
Memset speed - (rust) block size 16777216	9821.81 MByte/s (±7892.11 MByte/s)	10072.00 MByte/s (±8153.23 MByte/s)	0.98
alloc_benchmarks Build Time	296.15 s	293.98 s	1.01
alloc_benchmarks File Size	0.95 MB	0.95 MB	1.00
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	25753.01 Ticks (±1054.80 Ticks)	25979.67 Ticks (±1072.71 Ticks)	0.99
Allocations - Average Allocation time (no fail)	25753.01 Ticks (±1054.80 Ticks)	25979.67 Ticks (±1072.71 Ticks)	0.99
Allocations - Average Deallocation time	3076.12 Ticks (±1076.97 Ticks)	3078.39 Ticks (±1348.13 Ticks)	1.00
mutex_benchmark Build Time	298.48 s	295.48 s	1.01
mutex_benchmark File Size	0.98 MB	0.98 MB	1.00
Mutex Stress Test Average Time per Iteration - 1 Threads	36.56 ns (±4.36 ns)	36.76 ns (±3.72 ns)	0.99
Mutex Stress Test Average Time per Iteration - 2 Threads	30.46 ns (±3.56 ns)	29.88 ns (±3.19 ns)	1.02

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