[fuse-devel] slow reads

[snovgorodsky <svn...@ho...>]

Hi -

In my project I have a Fuse mount accessible through a  Samba share.
I use Fuse 2.7.4 , just basic fusexmp_fh.c with a small change to support
a-la Samba directory mapping:


#define setpath(mypath,path) { strcpy(mypath,ROOT_DIR); \
                               if( path[0] != '/' ) \
                               {   strcat(mypath,"/"); } \
                               strcat(mypath,path);}

I set ROOT_DIR when I start Fuse, and I use this macro in all calls which
take path as a parameter ( I could use subdir module, but this looks simple
enough for my testing purposes).

Fuse is mounted on 64-bit Linux machine (2.6.27 kernel), then accessed
through Samba from another 
Linux box(64-bit 2.6.5 kernel). I have a set of files that I move around -
about 260000 files, 100k to 10G in size, 
total about 110G.
I didn't see a significant  difference in performance when writing my test
files through Samba to Fuse  mount, as compared to Samba -> ext3. I do see,
however, about 20% slowdown in reads - reading through Samba from Fuse is
slower then reading through Samba from ext3. 
Does 20% sound as 'normal' performance degradation in this case?
How can I improve the read time ( use Fuse options, upgrade Fuse, etc)?


Thanks,
Sergey
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