Hi Mark, Mark Rutland <mark.rutland@xxxxxxx> writes: > On Fri, Jan 28, 2022 at 05:08:48PM +0100, Sven Schnelle wrote: >> We noticed the PR from Paul and are currently testing the fix. So far >> it's looking good. The configuration where we have seen the hang is a >> bit unusual: >> >> - 16 physical CPUs on the kvm host >> - 248 logical CPUs inside kvm > > Aha! 248 is notably *NOT* a power of two, and in this case the shift would be > wrong (ilog2() would give 7, when we need a shift of 8). > > So I suspect you're hitting the same issue as I was. Argh, indeed! I somehow changed 'power of two' to 'odd number' in my head. I guess it's time for the weekend. :-) Thanks!
