Mastodawn

return -ECLAIR;Jun 26, 2025

*types mount in WSL terminal*

...
C:\ on /mnt/c type 9p (rw,noatime,...)
...

?!?

Probably old news, but I didn't know until today that #9pfs is used in #WSL 😅

#TIL

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Marcin Kulik May 26, 2025

Aaand I’m back on #9pfs. The #virtiofs mount turned out to be unstable very quickly. All I/O on the mount started hanging just after 2 days, requiring hard reset of a VM. I guess I’ll try that again in 12 months 🤷‍♂️

Marcin Kulik May 6, 2025

I've switched from #9pfs to #virtiofs mount for a VM I run under my #proxmox host at home and did a few #fio benchmarks.

9pfs (before):

seq read (1M, 1 thread) - 1950 MiB/s
rand read (4K, 4 threads) - 213 MiB/s
seq write (1M, 1 thread) - 468 MiB/s
rand write (4K, 4 threads) - 80 MiB/s

virtiofs (after):

seq read (1M, 1 thread) - 5258 MiB/s
rand read (4K, 4 threads) - 291 MiB/s
seq write (1M, 1 thread) - 1074 MiB/s
rand write (4K, 4 threads) - 84 MiB/s

2.7x sequential read, 2.3x sequential write, 1.3x random read, and 1.05x random write.

Pretty good improvements!

Especially that this is for my media (movies/tv) mount where mostly sequential I/O is typically performed.

Note the underlying hardware is Samsung QVO SATA SSD, which is rather slow SSD, and likely a bottleneck in those random read/write tests. I expect there would be much bigger differences on a fast NVMe drive.