Re: Loosing transactions

[Pierre Beck <debian-bugs-MZZvbRqs/9F0RdzJJlgK+g@public.gmane.org>]

> We probably want to start by simplifying/narrowing it down a bit - we
> can eliminate the possibility of the disk having anything to do with it
> and just use the SSD by forcing everything to writeback mode:
>
> For that you'll want to disable both sequential bypass (echo 0 >
> /sys/block/bcache/bcacheN/sequential_cutoff) and the congested
> thresholds -
> echo 0 > /sys/fs/bcache/<cache set>/congested_read_threshold_us,
> echo 0 > /sys/fs/bcache/<cache set>/congested_write_threshold_us
>
> After that (assuming you're also in writeback mode) all writes will be
> writeback writes until the device is more than half full of dirty data.
>
> Can you check if transactions are still getting lost in that setup? If
> so (I kind of expect they will be) we may have to do a bit of
> blktracing, but that'll really narrow down the possibilities.
>

Yes, the most recent transactions are still lost.

Greetings,

Pierre Beck