On Tue, Jan 27, 2026 at 08:24:28PM +0530, Anuj gupta wrote: > Hi Christoph, > > Here are the QD1 latency numbers (in usec)
Thanks a lot! Adding in the baseline numbers, as I wanted to compare those: > Intel Optane: > > Sequential read > | size | baseline | xfs-bounce | xfs-pi | > +------+----------+-----------+-----------+ > | 4k | 7.18 | 13.62 | 7.20 | > | 64K | 36.40 | 99.66 | 34.16 | > | 1M | 206.38 | 258.88 | 306.23 | > +------+----------+------------+----------+ So for 4k and 64k reads we basically get back to the baseline. The 1M numbers are puzzling, though. I wonder if we need to add WQ_CPU_INTENSIVE or do some other tweaks to the XFS I/O completion workqueue so that we don't overload the scheduler.
