MSI-X support

[cagatay-y]

cloud-hypervisor only supports MSI-X interrupts for PCI devices, so support for MSI-X is needed to support running on it. Additionally, MSI-X can allow us to set separate interrupt handlers for the configuration change interrupts and queue updates (even per-queue handlers once we have multiple queues) in the future.

The implementation does not work on QEMU with the TAP network device (tested with cargo xtask ci rs --arch x86_64 --profile dev --package httpd --features ci,hermit/virtio-net qemu --accel --sudo --devices virtio-net-pci --tap) and possibly other platforms as well. It works with QEMU user network device in addition to cloud-hypervisor.

[github-actions]

Benchmark Results

Details

Benchmark	Current: 1ba6965	Previous: 5c2373f	Performance Ratio
startup_benchmark Build Time	98.38 s	103.05 s	0.95 ❗
startup_benchmark File Size	0.82 MB	0.82 MB	1.00 ❗
Startup Time - 1 core	0.96 s (±0.04 s)	0.96 s (±0.04 s)	1.00
Startup Time - 2 cores	0.96 s (±0.03 s)	0.98 s (±0.03 s)	0.98
Startup Time - 4 cores	0.95 s (±0.03 s)	0.97 s (±0.03 s)	0.98
multithreaded_benchmark Build Time	102.33 s	104.21 s	0.98 ❗
multithreaded_benchmark File Size	0.96 MB	0.96 MB	1.00 ❗
Multithreaded Pi Efficiency - 2 Threads	90.90 % (±8.14 %)	91.81 % (±7.46 %)	0.99
Multithreaded Pi Efficiency - 4 Threads	44.32 % (±4.10 %)	45.70 % (±2.92 %)	0.97
Multithreaded Pi Efficiency - 8 Threads	25.58 % (±2.03 %)	26.46 % (±2.12 %)	0.97
micro_benchmarks Build Time	127.28 s	114.94 s	1.11 ❗
micro_benchmarks File Size	0.97 MB	0.97 MB	1.00 ❗
Scheduling time - 1 thread	69.16 ticks (±3.57 ticks)	68.93 ticks (±2.98 ticks)	1.00
Scheduling time - 2 threads	37.49 ticks (±3.65 ticks)	40.06 ticks (±5.98 ticks)	0.94
Micro - Time for syscall (getpid)	3.69 ticks (±0.30 ticks)	3.73 ticks (±0.28 ticks)	0.99
Memcpy speed - (built_in) block size 4096	64825.76 MByte/s (±46480.44 MByte/s)	66994.48 MByte/s (±47719.76 MByte/s)	0.97
Memcpy speed - (built_in) block size 1048576	29795.84 MByte/s (±24791.54 MByte/s)	29385.58 MByte/s (±24481.39 MByte/s)	1.01
Memcpy speed - (built_in) block size 16777216	25036.98 MByte/s (±21099.43 MByte/s)	25064.43 MByte/s (±21125.13 MByte/s)	1.00
Memset speed - (built_in) block size 4096	65268.35 MByte/s (±46782.89 MByte/s)	67685.76 MByte/s (±48231.86 MByte/s)	0.96
Memset speed - (built_in) block size 1048576	30566.33 MByte/s (±25223.82 MByte/s)	30198.29 MByte/s (±24956.06 MByte/s)	1.01
Memset speed - (built_in) block size 16777216	25808.20 MByte/s (±21593.56 MByte/s)	25803.06 MByte/s (±21583.89 MByte/s)	1.00
Memcpy speed - (rust) block size 4096	58873.79 MByte/s (±43563.69 MByte/s)	55897.99 MByte/s (±41026.54 MByte/s)	1.05
Memcpy speed - (rust) block size 1048576	29869.12 MByte/s (±24837.65 MByte/s)	29938.47 MByte/s (±24931.05 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	24999.18 MByte/s (±20985.82 MByte/s)	23502.66 MByte/s (±19727.50 MByte/s)	1.06
Memset speed - (rust) block size 4096	59704.56 MByte/s (±44080.17 MByte/s)	57038.42 MByte/s (±41882.25 MByte/s)	1.05
Memset speed - (rust) block size 1048576	30625.77 MByte/s (±25255.06 MByte/s)	30755.70 MByte/s (±25383.86 MByte/s)	1.00
Memset speed - (rust) block size 16777216	25756.72 MByte/s (±21467.52 MByte/s)	24236.51 MByte/s (±20209.31 MByte/s)	1.06
alloc_benchmarks Build Time	104.30 s	104.50 s	1.00 ❗
alloc_benchmarks File Size	0.89 MB	0.89 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	6662.04 Ticks (±479.92 Ticks)	9529.16 Ticks (±370.84 Ticks)	0.70 ❗
Allocations - Average Allocation time (no fail)	6662.04 Ticks (±479.92 Ticks)	9529.16 Ticks (±370.84 Ticks)	0.70 ❗
Allocations - Average Deallocation time	1199.75 Ticks (±309.54 Ticks)	1304.79 Ticks (±577.98 Ticks)	0.92
mutex_benchmark Build Time	104.52 s	104.63 s	1.00 ❗
mutex_benchmark File Size	0.97 MB	0.97 MB	1.00 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.74 ns (±0.63 ns)	13.02 ns (±0.68 ns)	0.98
Mutex Stress Test Average Time per Iteration - 2 Threads	15.46 ns (±0.75 ns)	15.32 ns (±0.84 ns)	1.01

This comment was automatically generated by workflow using github-action-benchmark.

[mkroening]

pci_types is updated as of #2220.