On Wed, May 22, 2019 at 06:21:51AM +0530, Aarushi Mehta wrote: > On Tue, 2019-05-21 at 19:39 -0500, Eric Blake wrote: > > On 5/21/19 6:52 PM, Aarushi Mehta wrote: > > > Signed-off-by: Aarushi Mehta <mehta.aar...@gmail.com> > > > > Sparse on the details. The subject line says what, but without a > > 'why' > > for how io_uring is different from existing aio options, it's hard to > > see why I'd want to use it. Do you have any benchmark numbers? > > For peak performance, io_uring helps us get to 1.7M 4k IOPS with > polling. aio reaches a performance cliff much lower than that, at 608K. > If we disable polling, io_uring is able to drive about 1.2M IOPS for > the (otherwise) same test case. > > More details, and the source for the above is at > http://kernel.dk/io_uring.pdf
So that Aarushi's email isn't accidentally misquoted later on: These numbers are not via QEMU. QEMU is likely to show different performance results and they are expected to be lower due to virtualization overhead. Stefan
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