Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Jan 23, 2014 at 07:55:50AM -0500, Theodore Ts'o wrote:
> On Thu, Jan 23, 2014 at 07:35:58PM +1100, Dave Chinner wrote:
> > > 
> > > I expect it would be relatively simple to get large blocksizes working
> > > on powerpc with 64k PAGE_SIZE.  So before diving in and doing huge
> > > amounts of work, perhaps someone can do a proof-of-concept on powerpc
> > > (or ia64) with 64k blocksize.
> > 
> > Reality check: 64k block sizes on 64k page Linux machines has been
> > used in production on XFS for at least 10 years. It's exactly the
> > same case as 4k block size on 4k page size - one page, one buffer
> > head, one filesystem block.
> 
> This is true for ext4 as well.  Block size == page size support is
> pretty easy; the hard part is when block size > page size, due to
> assumptions in the VM layer that requires that FS system needs to do a
> lot of extra work to fudge around.  So the real problem comes with
> trying to support 64k block sizes on a 4k page architecture, and can
> we do it in a way where every single file system doesn't have to do
> their own specific hacks to work around assumptions made in the VM
> layer.

Yup, ditto for ocfs2.

Joel

-- 

"One of the symptoms of an approaching nervous breakdown is the
 belief that one's work is terribly important."
         - Bertrand Russell 

			http://www.jlbec.org/
			jlbec@xxxxxxxxxxxx

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]