search for: dirty_background_bytes

I've had a few systems with a lot of RAM and very busy filesystems come up with filesystem errors that took a manual 'fsck -y' after what should have been a clean reboot. This is particularly annoying on remote systems where I have to talk someone else through the recovery. Is there some time limit on the cache write with a 'reboot' (no options) command or is ext4 that

...hrough the recovery. > > Is there some time limit on the cache write with a 'reboot' (no > options) command or is ext4 that fragile? I'd say there's no limit in the amount of time the kernel waits until the blocks have been written to disk; driven by there parameters: vm.dirty_background_bytes = 0 vm.dirty_background_ratio = 10 vm.dirty_bytes = 0 vm.dirty_expire_centisecs = 3000 vm.dirty_ratio = 20 vm.dirty_writeback_centisecs = 500 ie, if the data cached on RAM is older than 30s or larger than 10% available RAM, the kernel will try to flush it to disk. Depending how much data needs to...

Franz Fellner <alpine.art.de at gmail.com> writes: > I also suffer from bad performance of notmuch new. I used notmuch > some years ago and notmuch new always felt instantanious. Had to stop > using it because internet was too slow to sync my mails :/ Now (with > better internet and a completely new setup using mbsync) indexing one > mail takes at least 10 seconds,

...; Is there some time limit on the cache write with a 'reboot' (no >> options) command or is ext4 that fragile? > > I'd say there's no limit in the amount of time the kernel waits until > the blocks have been written to disk; driven by there parameters: > > vm.dirty_background_bytes = 0 > vm.dirty_background_ratio = 10 > vm.dirty_bytes = 0 > vm.dirty_expire_centisecs = 3000 > vm.dirty_ratio = 20 > vm.dirty_writeback_centisecs = 500 > > ie, if the data cached on RAM is older than 30s or larger than 10% > available RAM, the kernel will try to flush it to...

...0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 10232 kB DirectMap2M: 901120 kB sysctl: vm.oom_dump_tasks = 0 vm.oom_kill_allocating_task = 1 vm.panic_on_oom = 1 vm.admin_reserve_kbytes = 8192 vm.block_dump = 0 vm.dirty_background_bytes = 0 vm.dirty_background_ratio = 10 vm.dirty_bytes = 0 vm.dirty_expire_centisecs = 3000 vm.dirty_ratio = 20 vm.dirty_writeback_centisecs = 500 vm.drop_caches = 0 vm.highmem_is_dirtyable = 0 vm.hugepages_treat_as_movable = 0 vm.hugetlb_shm_group = 0 vm.laptop_mode = 0 vm.legacy_va_layout = 0 vm.lowme...