[PATCH 1/2] pcapng: revert use of reciprocal divide for timestamps

[Stephen Hemminger]

On Sun, 27 Sep 2026 12:50:14 -0700
Stephen Hemminger <stephen at networkplumber.org> wrote:

> The use of recprocal divide caused in calculating timestamps
> caused overflow wraparound. This bug was introduced by confusion
> about bits, shift, and the test was too short to catch the
> problem.
> 
> Go back to just doing the divide which ends up faster on many
> than having to do 128 bit math on many CPU types.
> 
> This is not a pure git revert because there were other
> good things in that commit like handling earlier packets,
> and catching if TSC hz was zero.
> 
> Fixes: 4fc65615b274 ("pcapng: improve performance of timestamping")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
> ---

Both applied to next-net