On Mon, Sep 15, 2025 at 7:07 PM Sheng Zhao <[email protected]> wrote: > > > > 在 2025/9/15 16:21, Jason Wang 写道: > > On Mon, Sep 15, 2025 at 3:34 PM <[email protected]> wrote: > >> > >> From: Sheng Zhao <[email protected]> > >> > >> The allocation granularity of bounce pages is PAGE_SIZE. This may cause > >> even small IO requests to occupy an entire bounce page exclusively. > > > > This sounds more like an issue of the IOVA allocating that use the > > wrong granular? > > > > Sorry, the previous email has a slight formatting issue. > > The granularity of the IOVA allocator is customized during the > initialization of the vduse domain, and this value is also modified in > this commit.
Ok, let's add this to the changelog. Btw, do you have perf numbers to demonstrate the benefit? Thanks > > Thanks > > >> The > >> kind of memory waste will be more significant on arm64 with 64KB pages. > >> > >> So, optimize it by using fixed 4KB bounce pages. > >> > >> Signed-off-by: Sheng Zhao <[email protected]> > > > > Thanks > > >
