I recently came upon FS-Cache as an interesting feature to play around with, and so I did everything I thought I'd need to use it. I'm running 2.6.30-rc3, and I have cachefilesd 0.9 installed. I loaded the cachefiles and fscache modules into my kernel, and I started cachefilesd with a simple two-line config file, pointing it at /var/fscache and naming the cache "test". Fine, no errors. /var/fscache is mounted with user_xattr and is an ext4 filesystem. So I mount an NFS filesystem using -o fsc=test, and I get back no errors. ...nor, it seems, do I get any usage of it at all. I pulled GB and GB of data across NFS, and /proc/fs/fscache/stats thinks it's utterly unused... # cat /proc/fs/fscache/stats FS-Cache statistics Cookies: idx=0 dat=0 spc=0 Objects: alc=0 nal=0 avl=0 ded=0 ChkAux : non=0 ok=0 upd=0 obs=0 Pages : mrk=0 unc=0 Acquire: n=0 nul=0 noc=0 ok=0 nbf=0 oom=0 Lookups: n=0 neg=0 pos=0 crt=0 Updates: n=0 nul=0 run=0 Relinqs: n=0 nul=0 wcr=0 AttrChg: n=0 ok=0 nbf=0 oom=0 run=0 Allocs : n=0 ok=0 wt=0 nbf=0 Allocs : ops=0 owt=0 Retrvls: n=0 ok=0 wt=0 nod=0 nbf=0 int=0 oom=0 Retrvls: ops=0 owt=0 Stores : n=0 ok=0 agn=0 nbf=0 oom=0 Stores : ops=0 run=0 Ops : pend=0 run=0 enq=0 Ops : dfr=0 rel=0 gc=0 Am I missing something? I'm reasonably certain I'm not a complete idiot. cachefilesd even created cache and graveyard in /var/fscache, but...nothing ever shows up in it. Output from cachefilesd: # cachefilesd -s -n -d -f /etc/cachefilesd.conf About to bind cache Bound cache Daemon Started Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete Refilling cull table Scan complete [repeat forever] dmesg reports: Slow work thread pool: Starting up Slow work thread pool: Ready FS-Cache: Loaded CacheFiles: Loaded FS-Cache: Cache "test" added (type cachefiles) CacheFiles: File cache on sdi1 registered Am I oblivious? Missing something obvious? Is it magically known to be broken? I really want to make use of this, and I'm tremendously saddened that it appears to be doing nothing. - Rich -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
