On Mon, Dec 05, 2016 at 10:40:49AM -0600, Karl Rister wrote: > On 12/05/2016 08:56 AM, Stefan Hajnoczi wrote: > <snip> > > > Karl: do you have time to run a bigger suite of benchmarks to identify a > > reasonable default poll-max-ns value? Both aio=native and aio=threads > > are important. > > > > If there is a sweet spot that improves performance without pathological > > cases then we could even enable polling by default in QEMU. > > > > Otherwise we'd just document the recommended best polling duration as a > > starting point for users. > > > > I have collected a baseline on the latest patches and am currently > collecting poll-max-ns=16384. I can certainly throw in a few more > scenarios. Do we want to stick with powers of 2 or some other strategy?
Excellent, thanks! The algorithm self-tunes by doubling poll time so there's not much advantage to looking at non pow-2 values. Thanks, Stefan
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