You can disregard this message. I didn't realise there was a separate mailing list for cachefs. I've re-posted the message to the correct mailing list. -- Chris On Mon, 28 Feb 2022 at 19:24, Chris Chilvers <chilversc@xxxxxxxxx> wrote: > > While trying the new FS-Cache implementation using the 5.17-rc5 kernel on > Ubuntu 21.10 I ran into an issue where it appears that FS-Cache was not being > used when the sync mount option is enabled. > > While monitoring /proc/fs/fscache/stats it was observed there were high writes > to the cache volume, but no reads: > > IO : rd=0 wr=344713665 > > Further tracing of /sys/kernel/debug/tracing/events/fscache/fscache_access shows > a large number of io_write operations, but no io_read operations. > > The volume did fill up and perform culling as expected. > > When the mount option was changed from sync to async the cache performed as > expected and a mixture of io_write and io_read was observed. > > -- Chris
