Re: [PATCH] thunderbolt: Reduce retry timeout to speed up boot for some devices

[Werner Sembach]

Am 20.12.23 um 17:04 schrieb Greg KH:
> On Wed, Dec 20, 2023 at 04:23:15PM +0100, Werner Sembach wrote:
> > Am 20.12.23 um 16:09 schrieb Werner Sembach:
> > > This is a followup to "thunderbolt: Workaround an IOMMU fault on certain
> > > systems with Intel Maple Ridge".
> > >
> > > It seems like the timeout can be reduced to 250ms. This reduces the overall
> > > delay caused by the retires to ~1s. This is about the time other things
> > > being initialized in parallel need anyway*, so like this the effective boot
> > > time is no longer compromised.
> > >
> > > *I only had a single device available for my measurements: A Clevo X170KM-G
> > > desktop replacement notebook.
> > >
> > > Signed-off-by: Werner Sembach <wse@xxxxxxxxxxxxxxxxxxx>
> > I wonder if this could also land in stable? Or would it be to risky?
> If it's really a bugfix now, why would it _not_ be relevant for stable?

edit: Sorry if this is the 3rd time I send this, I got mail server 
errors (hopefully fixed now) and am not sure if it reached out

Because it changes a timeout that could cause issues if set to low: This 
Patch sets to to 250ms. Set to 50ms it causes issues, currently it's 
2000ms, 2 people tested that 250ms is enough, but i don't know if this 
is a big enough sample size for stable.

The advantage is significantly faster boot time on affected devices 
(~12s down to ~3s), however they do already work fine without it.

Kind regards,

Werner

> thanks,
>
> greg k-h