On Mon, 12 May 2025 at 21:03, Joanne Koong <joannelkoong@xxxxxxxxx> wrote: > > On Wed, May 7, 2025 at 7:45 AM Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > > > > On Wed, 23 Apr 2025 at 01:56, Joanne Koong <joannelkoong@xxxxxxxxx> wrote: > > > > > For servers that do not need to access pages after answering the > > > request, splice gives a non-trivial improvement in performance. > > > Benchmarks show roughly a 40% speedup. > > > > Hmm, have you looked at where this speedup comes from? > > > > Is this a real zero-copy scenario where the server just forwards the > > pages to a driver which does DMA, so that the CPU never actually > > touches the page contents? > > I ran the benchmarks last month on the passthrough_ll server (from the > libfuse examples) with the actual copying out / buffer processing > removed (eg the .write_buf handler immediately returns > "fuse_reply_write(req, fuse_buf_size(in_buf));". Ah, ok. It would be good to see results in a more realistic scenario than that before deciding to do this. Thanks, Miklos
