Re: [PATCH V2] Consider inflight IO in io accounting for high latency devices

[Bart Van Assche]

On 10/16/23 13:01, Gulam Mohamed wrote:
> [GULAM]: Yes, it will be called for every submitted bio but for the
> high latency devices it will not have much impact. This is indicated
> by the latency figures I provided in the review mail, with and
> without our patch.

Calling tag iteration code from the hot path is wrong.

There are more devices than only hard disks that have a single hardware
queue, e.g. certain SSDs. I'm pretty sure that this patch will have a
significant negative performance impact for such devices.

Thanks,

Bart.