Re: [fuse-devel] enabling >4k writes (was: Re: fuse 2.7.3, kernel 2.6.25, and NFS)

[Szabolcs S. <sz...@nt...>]

On Tue, 17 Jun 2008, Brian Wang wrote:

> I used dd with block size 1M, 

I used that too and checked that dd indeed uses 1M write blocks 
with strace.

> I will try to set blksize and see what happens.

I think you mean st_blksize. The 'blksize' FUSE option should be
irrelevant.

I tried now setting st_blksize to 1M too but the writes still use 
4kB blocks. I use the git kernel with fuse cvs.

	Szaka

> --------------------------------------------------
> From: "Miklos Szeredi" <mi...@sz...>
> Sent: Tuesday, June 17, 2008 6:54 AM
> To: <sz...@nt...>
> Cc: <ywa...@ho...>; <fus...@li...>; 
> <mi...@sz...>
> Subject: Re: [fuse-devel] enabling >4k writes (was: Re: fuse 2.7.3, kernel 
> 2.6.25, and NFS)
> 
> >> > Thanks very much. But still not right. and more problems.
> >> >
> >> > 1. used -o big_writes and noforget. Still see 4k writes.
> >>
> >> Hmmm, you need fuse cvs user space but it seems I can reproduce the
> >> problem.
> >
> > If the application is doing 4k writes, then fuse can't merge them into
> > bigger requests.  Usually it is possible to give a hint to the
> > application about optimal write size by setting st_blksize in
> > ->getattr().
> >
> > Miklos
> > 
> 
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