Johannes Berg <johannes@xxxxxxxxxxxxxxxx> writes: > Toke Høiland-Jørgensen wrote: > >> When we did the original tests for the optimal value of sk_pacing_shift, we >> came up with 6 ms of buffering as the default. Sadly, 6 is not a power of >> two, so when picking the shift value I erred on the size of less buffering >> and picked 4 ms instead of 8. This was probably wrong; those 2 ms of extra >> buffering makes a larger difference than I thought. >> >> So, change the default pacing shift to 7, which corresponds to 8 ms of >> buffering. The point of diminishing returns really kicks in after 8 ms, and >> so having this as a default should cut down on the need for extensive >> per-device testing and overrides needed in the drivers. >> >> Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx> > > Patch applied to wireless.git, thanks. > > a41f56b9a17a (HEAD -> mac80211) mac80211: Change default > tx_sk_pacing_shift to 7 Cool, thanks! What's the easiest way to backport this? I figure it's easier to just update sk_pacing_shift_update() in tx.c for 4.19 (which predates the addition of the driver override hook); shall I just send a separate patch to stable for that? Or do we need to backport the driver override hook as well? -Toke
