[fuse-devel] big_writes/direct_io problem

[ronnie s. <ron...@gm...>]

I have a fuse filesystem and most things work very well.

In order to get good write performance I use big_writes, however
big_writes only work for me if and only if I also use direct_io.
Otherwise all I/O passed to fuse is serialized 4kb at a time, and thus
performance is suboptimal.


I use dd if=/dev/zero of=/bigfile bs=1M count=1 to test with and I log
all calls to read/write to a logfile I can watch to see what happens.

Using -o big_writes results in sequential 4kbyte writes one at a time
which is slow.
Only if I combine this with -o direct_io will I get large write i/o sizes.


I can not use -o direct_io since I want to re-export the filesystem through NFS.
I am compiling and linking my application against 2.8.0-pre1 from
http://downloads.sourceforge.net/fuse/fuse-2.8.0-pre1.tar.gz?modtime=1215728006&big_mirror=0

Are there any later, more recent versions of Fuse I should try instead?


regards
ronnie sahlberg