On 16.09.2021 19:52, Andrew Cooper wrote: > On 16/09/2021 13:30, Jan Beulich wrote: >> On 16.09.2021 13:10, Dmitry Isaikin wrote: >>> From: Dmitry Isaykin <[email protected]> >>> >>> This significantly speeds up concurrent destruction of multiple domains on >>> x86. >> This effectively is a simplistic revert of 228ab9992ffb ("domctl: >> improve locking during domain destruction"). There it was found to >> actually improve things; > > Was it? I recall that it was simply an expectation that performance > would be better...
My recollection is that it was, for one of our customers. > Amazon previously identified 228ab9992ffb as a massive perf hit, too. Interesting. I don't recall any mail to that effect. > Clearly some of the reasoning behind 228ab9992ffb was flawed and/or > incomplete, and it appears as if it wasn't necessarily a wise move in > hindsight. Possible; I continue to think though that the present observation wants properly understanding instead of more or less blindly undoing that change. Jan
