Hi! During the last weeks I experienced some performance problems with a large file-system on XFS basis. Sometimes for instance ls is painfully. Immidiatly afterwards ls on the same directory is immidiate. I used strace on this ls and found that during the first ls the lstat-calls need approx 0.02s each while during the second ls the are two orders of magnitude faster. Googling around I stumbled upon some messages similar like this http://www.opensubscriber.com/message/linux-xfs@oss.sgi.com/1355060.html which have in common a) they're from around 2006 b) they suggest to increase a mount-option ihashsize. This mount option is listed as deprecated in the current kernel-doc So my question: does anyone have experience with that kind of performance problem? Do you think it is a XFS problem or are there some other tuning parameters in the kernel that could be modified for instance via /proc? The reason why I'm asking here is that it is a production file-system so I would be very unpopular if I experiment too much (a couple of reboots is OK ;) ) Bernhard PS: the situation got worse during the last weeks when the file-system increased in size, so the option that some kind of buffer now is too small and I'm experiencing some kind of thrashing seems very likely to me