Re: [fuse-devel] [Fuse-2.8] big_write option --> 128kb write syscall ... howto set higher value

[Matthew F. <mat...@ga...>]

chpstcks wrote:
> On Thu, 5 Mar 2009, François Thiebolt wrote:
>> Ok, you need to modifiy both the kernel, the fuse kernel module (within
>> kernel tree) along with the Fuse library.
>>
>> *KERNEL PART* (fuse module is already within the kernel repository)
>> #define VM_MAX_READAHEAD (include/linux/mm.h)
>> #define FUSE_MAX_PAGES_PER_REQ (fs/fuse/fuse_i.h)
>>
>> *FUSE LIB PART*
>> /lib/fuse_kern_chan.c
>> #define MIN_BUFSIZE *0x401000* (for 4M write request is that ok *miklos*
>> ?)
> 
> Modifying the 3 values works perfectly for me.
> i set
> 
> #define VM_MAX_READAHEAD 1024
> #define FUSE_MAX_PAGES_PER_REQ 256
> #define MIN_BUFSIZE 0x101000
> 
> and both read write are now at 1mb! 
> now i just need to figure out how to tell nfs3 and samba to send 1mb
> requests to the kernel (if anyone has any insights, please let me know.)

You would just increase the third parameter of write and/or pwrite
(http://opengroup.org/onlinepubs/007908775/xsh/write.html).  It can be
up to SIZE_MAX.  Of course you may sometimes need to change the program
logic in non-trivial ways.

Matt Flaschen