On Fri, 19 May 2023 at 10:40, David Howells <dhowells@xxxxxxxxxx> wrote: > > Chris Chilvers <chilversc@xxxxxxxxx> wrote: > > > While testing the fscache performance fixes [1] that were merged into 6.4-rc1 > > it appears that the caching no longer works. The client will write to the cache > > but never reads. > > Can you try reading from afs? You would need to enable CONFIG_AFS_FS in your > kernel if it's not already set. > > Install kafs-client and do: > > systemctl enable afs.mount > md5sum /afs/openafs.org/software/openafs/1.9.1/openafs-1.9.1-doc.tar.bz2 > cat /proc/fs/fscache/stats FS-Cache statistics Cookies: n=13 v=7 vcol=0 voom=0 Acquire: n=13 ok=13 oom=0 LRU : n=1 exp=0 rmv=0 drp=0 at=2833 Invals : n=0 Updates: n=0 rsz=0 rsn=0 Relinqs: n=0 rtr=0 drop=0 NoSpace: nwr=0 ncr=0 cull=0 IO : rd=0 wr=18 RdHelp : RA=18 RP=0 WB=0 WBZ=0 rr=0 sr=0 RdHelp : ZR=1 sh=0 sk=0 RdHelp : DL=18 ds=18 df=0 di=0 RdHelp : RD=0 rs=0 rf=0 RdHelp : WR=18 ws=18 wf=0 This was on an instance that was only just created, so the cache was initially unused (all the counters were 0). > umount /afs/openafs.org > md5sum /afs/openafs.org/software/openafs/1.9.1/openafs-1.9.1-doc.tar.bz2 > cat /proc/fs/fscache/stats FS-Cache statistics Cookies: n=13 v=7 vcol=0 voom=0 Acquire: n=26 ok=26 oom=0 LRU : n=1 exp=1 rmv=0 drp=0 at=467 Invals : n=0 Updates: n=0 rsz=0 rsn=0 Relinqs: n=13 rtr=0 drop=13 NoSpace: nwr=0 ncr=0 cull=0 IO : rd=18 wr=18 RdHelp : RA=36 RP=0 WB=0 WBZ=0 rr=0 sr=0 RdHelp : ZR=1 sh=0 sk=0 RdHelp : DL=18 ds=18 df=0 di=0 RdHelp : RD=18 rs=18 rf=0 RdHelp : WR=18 ws=18 wf=0 Looks like the cache is working fine with AFS. The second md5sum seemed a lot quicker than the first. -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/linux-cachefs
