Hi world, I have a machine with a large /scratch pool mounted via NFS. If I mount /scratch with -t nfs4 -o rw,fsc, and do ~50 MB of IO, I get the same: # cat /proc/fs/fscache/stats FS-Cache statistics Cookies: idx=6 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=6 nul=0 noc=0 ok=6 nbf=0 oom=0 Lookups: n=0 neg=0 pos=0 crt=0 Updates: n=0 nul=0 run=0 Relinqs: n=2 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 If I mount /scratch with -t nfs -o rw,fsc, and do ~50 MB, I get: FS-Cache statistics Cookies: idx=6 dat=1 spc=0 Objects: alc=4 nal=0 avl=4 ded=0 ChkAux : non=0 ok=1 upd=0 obs=0 Pages : mrk=30735 unc=26 Acquire: n=7 nul=0 noc=0 ok=7 nbf=0 oom=0 Lookups: n=4 neg=2 pos=2 crt=2 Updates: n=0 nul=0 run=0 Relinqs: n=2 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=18 ok=4 wt=1 nod=14 nbf=0 int=0 oom=0 Retrvls: ops=18 owt=1 Stores : n=30720 ok=30720 agn=0 nbf=0 oom=0 Stores : ops=13 run=30733 Ops : pend=1 run=30 enq=30733 Ops : dfr=0 rel=31 gc=0 So...what's going on here? Am I missing something, or is -t nfs4 somehow making it magically ignored? (2.6.30-rc6 x86_64, those are all the -o options I passed, I initially noticed this with far more options passed and reduced to this test case, the cache-backing filesystem has user_xattr enabled and is an empty 500GB disk save for this) - Rich -- Os números não mentem, mas os mentirosos fabricam números. -- Itamar Franco -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
