On 03/08/2014 09:58 PM, Chen Gang wrote: > OK, thanks. > > Next, I will/should continue to analyse the performance issue for 9pfs > when users drop into a long directory path under bash shell. >
After have a test, I am sure it is not 9pfs issue, either not Qemu's issue, it's Linux kernel vfs or block sub-systems' issue. The related test environments (originally, our 9pfs is upper on ext4): - for ext4 file system under my Fedora laptop (Qemu does not start). - for ntfs file system under my Fedora laptop (Qemu does not start). - for ext4 file system under my Ubuntu in Qemu. For a very long file name (e.g. > 3K long), all of them are very very slow. (and I also tested the ext2 /boot partition under Ubuntu in Qemu, it is not slow, I guess the reson is its partition size is small). Next, I will/shall communicate with upstream kernel for it. :-) > Although I am not quite sure, hope I can find the root cause within > month (2014-03-31). > > Welcome any suggestions, discussions, and completions for it. > > Thanks. > -- Chen Gang Open, share and attitude like air, water and life which God blessed
