Re: [PATCH 0/4] export/fuse: Add FUSE-over-io_uring for Storage Exports

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Sat, Aug 30, 2025 at 08:00:00AM -0400, Brian Song wrote:
> We used fio to test a 1 GB file under both traditional FUSE and
> FUSE-over-io_uring modes. The experiments were conducted with the
> following iodepth and numjobs configurations: 1-1, 64-1, 1-4, and 64-4,
> with 70% read and 30% write, resulting in a total of eight test cases,
> measuring both latency and throughput.
> 
> Test results:
> 
> https://gist.github.com/hibriansong/a4849903387b297516603e83b53bbde4

Hanna: You benchmarked the FUSE export coroutine implementation a little
while ago. What do you think about these results with
FUSE-over-io_uring?

What stands out to me is that iodepth=1 numjobs=4 already saturates the
system, so increasing iodepth to 64 does not improve the results much.

Brian: What is the qemu-storage-daemon command-line for the benchmark
and what are the details of /mnt/tmp/ (e.g. a preallocated 10 GB file
with an XFS file system mounted from the FUSE image)?

Thanks,
Stefan

> 
> 
> 
> 
> On 8/29/25 10:50 PM, Brian Song wrote:
> > Hi all,
> >
> > This is a GSoC project. More details are available here:
> > https://wiki.qemu.org/Google_Summer_of_Code_2025#FUSE-over-io_uring_exports
> >
> > This patch series includes:
> > - Add a round-robin mechanism to distribute the kernel-required Ring
> > Queues to FUSE Queues
> > - Support multiple in-flight requests (multiple ring entries)
> > - Add tests for FUSE-over-io_uring
> >
> > More detail in the v2 cover letter:
> > https://lists.nongnu.org/archive/html/qemu-block/2025-08/msg00140.html
> >
> > And in the v1 cover letter:
> > https://lists.nongnu.org/archive/html/qemu-block/2025-07/msg00280.html
> >
> >
> > Brian Song (4):
> >    export/fuse: add opt to enable FUSE-over-io_uring
> >    export/fuse: process FUSE-over-io_uring requests
> >    export/fuse: Safe termination for FUSE-uring
> >    iotests: add tests for FUSE-over-io_uring
> >
> >   block/export/fuse.c                  | 838 +++++++++++++++++++++------
> >   docs/tools/qemu-storage-daemon.rst   |  11 +-
> >   qapi/block-export.json               |   5 +-
> >   storage-daemon/qemu-storage-daemon.c |   1 +
> >   tests/qemu-iotests/check             |   2 +
> >   tests/qemu-iotests/common.rc         |  45 +-
> >   util/fdmon-io_uring.c                |   5 +-
> >   7 files changed, 717 insertions(+), 190 deletions(-)
> >
> 

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