On 9/29/22 3:59 AM, Sagi Grimberg wrote: >> 3. Do you have some performance numbers (we're touching the fast path here) ? > > This is pretty light-weight, accounting is per-cpu and only wrapped by > preemption disable. This is a very small price to pay for what we gain. Is it? Enabling IO stats for normal devices has a very noticeable impact on performance at the higher end of the scale. So much so that I've contemplated how we can make this less expensive than it currently is. -- Jens Axboe
