Re: [fuse-devel] Fuse performance over ext4 performance

[Alain S. <asp...@gm...>]

On Thu, Oct 20, 2011 at 6:09 PM, Samuel Gallard
<sam...@ve...> wrote:
> Hello,
>
> I am trying to benchmark fuse over the default filesystem.
>
> For the test, I am using an Ubuntu server 10.04 LTS with a Raid 1
> system in ext4 and the kernel 2.6-38-11-server.
>
> I used fusexmp.c (web.mit.edu/~ecprice/fuse-2.7.0/example/fusexmp.c) with
> the fuse version 2.8.6 which just permits to replace a normal file system.
>
> Did anyone ever succeed to obtain almost the same performance in reading and
> writing with Fuse ?

Yes close to , use fusexmp_fh.c instead

>
> For the moment, I used the following option to tweak Fuse and the kernel :
> - VM_MAX_READAHEAD located in /usr/src/linux-headers-2.6.*/include/linux/mm.h
>  : 4096
> - MIN_BUFSIZE located in */fuse-2.*/lib/fuse_kern_chan.c : 0x401000
> - FUSE_MAX_PAGES_PER_REQ located in fs/fuse/fuse_i.h : 256
>
> For the mount point, I have the following options : big_writes, large_read and
> direct_io.

try removing diret_io
I think lare_read is useless here
just try this

big_writes,max_read=131072,max_write=131072


>
> To check the performance, I use it over samba (with the option sendfile=yes)
> to write and read files.

I don't know how to tune FUSE to perform well with samba.
I think nothing to do.

>
> I obtain a loss of 10% when writing within the fuse mount point and around a
> loss of 50% when reading from it.
>
> Did I miss an option or something ? Or is it a normal behavior ?

Don't expect to be fatser :-)

>
> Regards
>
> Samuel
>
>
>
>
>
>
>
>
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Alain Spineux                   |  aspineux gmail com
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