Hi Mark, > useful. I suppose one might also make that argument about things like > statfs, getattr - the only time I was able to make them change was in > response to lfs commands. Might that logic also be applied to > extended attributes and acl counters which I suspect also fall into > the category of slowly changing counters?
If you have ACLs enabled on your MDS, then every "ls -l" will induce getxattr()s and the mds_getxattr counter will be increased by as much. So this can change quickly. mds_setxattr, on the other hand, may change less often, since you usually set ACLs less often than you list files. But it can still be interesting to see if mds_setxattr goes through the roof. > On the other hand, it seems like the 'reint' counters are the ones > that tend to change a lot. Perhaps a clue is they're all prefaced > with reint which leads me to ask if there is some simple definition > of what reint actually means other than 'reintegrated operations'? I'd bet on "request identification" or something along those lines. > Perhaps such a definition will help explain why setattr is a reint > counter but getattr is not. In fact, I have seen getattr_lock change > a lot more than getattr. What is the difference between the 2 > (obviously the latter is some sort of lock but it must be used more > than just when incrementing getattr since they don't change > together)? I'm only speculating here, but I believe that extended attributes which are modifiable by a user on a client (like ACLs) are counted in *_xattr, while internal extended attributes used by the MDS, are counted in gettatr. > That all said, it feels like the data to report is all the reints, > getattr, getattr_lock and sync. I would also be interested in seeing (dis)connect (this can probably reveal network problems, if it increases too much), as well as quotactl and get/setxattr, since I use quotas and ACLs. :) Cheers, -- Kilian _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
