On Thu, Jun 23, 2022 at 03:32:30PM +0200, Jan Beulich wrote: > On 23.06.2022 11:08, Roger Pau Monne wrote: > > Testing on a Kaby Lake box with 8 CPUs leads to the serial buffer > > being filled halfway during dom0 boot, and thus a non-trivial chunk of > > Linux boot messages are dropped. > > > > Increasing the buffer to 32K does fix the issue and Linux boot > > messages are no longer dropped. There's no justification either on > > why 16K was chosen, and hence bumping to 32K in order to cope with > > current systems generating output faster does seem appropriate to have > > a better user experience with the provided defaults. > > Just to record what was part of an earlier discussion: I'm not going > to nak such a change, but I think the justification is insufficient: > On this same basis someone else could come a few days later and bump > to 64k, then 128k, etc.
Indeed, and that would be fine IMO. We should aim to provide defaults that work fine for most situations, and here I don't see what drawback it has to increase the default buffer size from 16kiB to 32kiB, and I would be fine with increasing to 128kiB if that's required for some use case, albeit I have a hard time seeing how we could fill that buffer. If I can ask, what kind of justification you would see fit for granting an increase to the default buffer size? Thanks, Roger.