Hans Reiser wrote (ao): > Craig Shelley wrote: > >With the noatime and nodiratime options, the problem of accessing files > >causing a massive sync time has gone. See the results below. > > > >Although this option has made the system useable, I don't think it has > >fully solved the problem. I think fsync() and sync() performance is > >still poor, I will do a bit more testing and get back. > > Sounds like we need to specifically optimize fsync. Well, we have > known that for a while, but now it is more true.
Please don't forget that the behavior without 'noatime' is new. I never had my disk mounted 'noatime', and until recently did not experience the huge slowdown. I assume the other people who reported this agree. So whether or not fsync needs to be optimized, something changed in Reiser4 or -mm that causes the huge slowdown. -- Humilis IT Services and Solutions http://www.humilis.net
