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【测试方法】
config: CONFIG_VIRTIO_FS=y && CONFIG_FUSE_DAX=y
qemu-5.1.0
fio-3.27

mkdir -p /tmp/shared
sudo mkfs.ext4 -F /dev/nvme0n1
sudo mount -o user_xattr /dev/nvme0n1 /tmp/shared
磁盘挂载参考 https://virtio-fs.gitlab.io/howto-qemu.html

sudo ./virtiofsd --socket-path=/tmp/vhostqemu -o source=/tmp/shared -o cache=always

      -chardev socket,id=char0,path=/tmp/vhostqemu \
      -device vhost-user-fs-pci,chardev=char0,tag=myfs \
      -object memory-backend-memfd,id=mem,size=16G,share=on \
      -numa node,memdev=mem \

mount -t virtiofs myfs /mnt
./fio --ioengine=libaio --direct=1 --name=test --filename=/mnt/random_read_write.fio --bs=4k --iodepth=64 --size=4G --readwrite=randwrite

【server 不支持 FUSE_HANDLE_KILLPRIV_V2】 X86_64 ext4 +25.8%
before: AVG: 54.34MiB/s
WRITE: bw=67.6MiB/s (70.9MB/s), 67.6MiB/s-67.6MiB/s (70.9MB/s-70.9MB/s), io=4096MiB (4295MB), run=60590-60590msec
WRITE: bw=57.6MiB/s (60.4MB/s), 57.6MiB/s-57.6MiB/s (60.4MB/s-60.4MB/s), io=4096MiB (4295MB), run=71123-71123msec
WRITE: bw=48.8MiB/s (51.2MB/s), 48.8MiB/s-48.8MiB/s (51.2MB/s-51.2MB/s), io=4096MiB (4295MB), run=83948-83948msec
WRITE: bw=48.6MiB/s (51.0MB/s), 48.6MiB/s-48.6MiB/s (51.0MB/s-51.0MB/s), io=4096MiB (4295MB), run=84246-84246msec
WRITE: bw=49.1MiB/s (51.5MB/s), 49.1MiB/s-49.1MiB/s (51.5MB/s-51.5MB/s), io=4096MiB (4295MB), run=83392-83392msec

after: AVG: 68.38MiB/s
WRITE: bw=68.7MiB/s (72.0MB/s), 68.7MiB/s-68.7MiB/s (72.0MB/s-72.0MB/s), io=4096MiB (4295MB), run=59661-59661msec
WRITE: bw=68.4MiB/s (71.7MB/s), 68.4MiB/s-68.4MiB/s (71.7MB/s-71.7MB/s), io=4096MiB (4295MB), run=59867-59867msec
WRITE: bw=67.3MiB/s (70.6MB/s), 67.3MiB/s-67.3MiB/s (70.6MB/s-70.6MB/s), io=4096MiB (4295MB), run=60847-60847msec
WRITE: bw=68.4MiB/s (71.7MB/s), 68.4MiB/s-68.4MiB/s (71.7MB/s-71.7MB/s), io=4096MiB (4295MB), run=59861-59861msec
WRITE: bw=69.1MiB/s (72.4MB/s), 69.1MiB/s-69.1MiB/s (72.4MB/s-72.4MB/s), io=4096MiB (4295MB), run=59284-59284msec

社区链接： https://patchwork.kernel.org/project/linux-fsdevel/cover/20201009181512.65496-1-vgoyal@redhat.com/

allow_direct_io xattr

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 支持】

root
WRITE: bw=70.0MiB/s (73.4MB/s), 70.0MiB/s-70.0MiB/s (73.4MB/s-73.4MB/s), io=4096MiB (4295MB), run=58520-58520msec

test
WRITE: bw=67.3MiB/s (70.6MB/s), 67.3MiB/s-67.3MiB/s (70.6MB/s-70.6MB/s), io=4096MiB (4295MB), run=60858-60858msec

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 不支持】

root
WRITE: bw=50.2MiB/s (52.6MB/s), 50.2MiB/s-50.2MiB/s (52.6MB/s-52.6MB/s), io=4096MiB (4295MB), run=81673-81673msec

test
WRITE: bw=44.6MiB/s (46.8MB/s), 44.6MiB/s-44.6MiB/s (46.8MB/s-46.8MB/s), io=4096MiB (4295MB), run=91839-91839msec

xattr

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 支持】

root
WRITE: bw=62.4MiB/s (65.5MB/s), 62.4MiB/s-62.4MiB/s (65.5MB/s-65.5MB/s), io=4096MiB (4295MB), run=65598-65598msec

test
WRITE: bw=64.5MiB/s (67.6MB/s), 64.5MiB/s-64.5MiB/s (67.6MB/s-67.6MB/s), io=4096MiB (4295MB), run=63534-63534msec

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 不支持】

root
WRITE: bw=52.8MiB/s (55.4MB/s), 52.8MiB/s-52.8MiB/s (55.4MB/s-55.4MB/s), io=4096MiB (4295MB), run=77519-77519msec

test
WRITE: bw=54.5MiB/s (57.1MB/s), 54.5MiB/s-54.5MiB/s (57.1MB/s-57.1MB/s), io=4096MiB (4295MB), run=75199-75199msec

allow_direct_io

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 支持】

root
WRITE: bw=63.1MiB/s (66.2MB/s), 63.1MiB/s-63.1MiB/s (66.2MB/s-66.2MB/s), io=4096MiB (4295MB), run=64902-64902msec

test
WRITE: bw=59.3MiB/s (62.2MB/s), 59.3MiB/s-59.3MiB/s (62.2MB/s-62.2MB/s), io=4096MiB (4295MB), run=69096-69096msec

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 不支持】

root
WRITE: bw=67.7MiB/s (71.0MB/s), 67.7MiB/s-67.7MiB/s (71.0MB/s-71.0MB/s), io=4096MiB (4295MB), run=60506-60506msec

test
WRITE: bw=63.0MiB/s (66.0MB/s), 63.0MiB/s-63.0MiB/s (66.0MB/s-66.0MB/s), io=4096MiB (4295MB), run=65028-65028msec

无

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 支持】

root
WRITE: bw=64.2MiB/s (67.3MB/s), 64.2MiB/s-64.2MiB/s (67.3MB/s-67.3MB/s), io=4096MiB (4295MB), run=63838-63838msec

test
WRITE: bw=63.7MiB/s (66.8MB/s), 63.7MiB/s-63.7MiB/s (66.8MB/s-66.8MB/s), io=4096MiB (4295MB), run=64344-64344msec

【server 支持 FUSE_HANDLE_KILLPRIV_V2, client 不支持】

root
WRITE: bw=66.7MiB/s (69.9MB/s), 66.7MiB/s-66.7MiB/s (69.9MB/s-69.9MB/s), io=4096MiB (4295MB), run=61448-61448msec

test
WRITE: bw=63.9MiB/s (67.0MB/s), 63.9MiB/s-63.9MiB/s (67.0MB/s-67.0MB/s), io=4096MiB (4295MB), run=64140-64140msec