On 23.05.23 21:44, Sergey Organov wrote: > "Linux regression tracking (Thorsten Leemhuis)" > <regressions@xxxxxxxxxxxxx> writes: > >> Hi, Thorsten here, the Linux kernel's regression tracker. Top-posting >> for once, to make this easily accessible to everyone. >> >> Stefan, was this regression ever solved? It doesn't look like it, but >> maybe I'm missing something. >> >> If it wasn't solved: what needs to be done to get this rolling again? > > Not Stefan, Thx to both you and Stefan for the update. > but as far as I can tell, the problem is that on Stefan's > build the kernel has rather large periods of interrupts being disabled, > so any attempt to decrease IRQs frequency from UART by raising FIFO IRQ > threshold causes "regression" that manifests itself as missing > characters on receive. I'm not sure if it's tuning FIFO level that is in > fact a regression in this case. Not totally sure, but I guess Linus stance in this case would be along the lines of "commit 7a637784d517 made an existing issue worse; either the people involved in it fix it, or we revert that commit[1], as it's causing a regression". At least we *iirc* had situations he handled like that. [1] of course unless a revert would cause regressions for others -- which i guess might be the case here, as that was added in 5.18 already. So let's not bring Linus in. > Solving this would need to identify the cause of interrupts being > disabled for prolonged times, and nobody volunteered to investigate this > further. Well, Stefan kind of did to do so in his spare time, but asked for "clear instructions to investigate this further". Could you maybe provide those? If not: who could? > One suspect, the Linux serial console, has been likely excluded > already though, as not actually being in use for printk() output. Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page.
