Is there a kernel option or sysfs toggle that disables write caching? Or forces the kernel to commit everything constantly. ------ I don't really want to join another ML, especially a higher traffic one just to ask this when it only bugs me sometimes. But I'll shut up if this is unwanted. ------ I use a similar kernel config with respect to selected options on all my systems but this only effect my laptop. On any of my personal system or system I have remote access too nr_dirty drifts up and down and nr_writeback stays around 0 (assuming the system isn't working hard). On my laptop both nr_dirty and nr_writeback stay at 0. I can make them go up to 10ish if I untar something but then almost immediately go back to 0. If I didn't know better I would swear dirty_*_centisecs or something was set to a near instant commit interval but I haven't found evidence of that. The hard drive light blinks almost constantly once a second, even if I'm at a X login screen. As I said this doesn't bug me most of the time but if I let my FF session get too large or start multiple VMs anything that might make me swap a little, the machine pretty much dies from IOWAIT. Which I'm guessing is because it's trying to flush (syncfs?) imediately and constantly. You guys spend all day in the IO subsystem, any idea where I can keep looking? It has persisted across reboots and kernel updates. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
