On Sat, Feb 13, 2016 at 9:39 PM, Stuart Henderson <s...@spacehopper.org> wrote:
> There was this commit, I don't *think* it got reverted.
>
>
>
> CVSROOT: /cvs
> Module name: src
> Changes by: b...@cvs.openbsd.org 2013/06/11 13:01:20
>
> Modified files:
> sys/kern : kern_sysctl.c spec_vnops.c vfs_bio.c
> vfs_biomem.c vfs_vops.c
> sys/sys : buf.h mount.h
> sys/uvm : uvm_extern.h uvm_page.c
> usr.bin/systat : iostat.c
>
> Log message:
> High memory page flipping for the buffer cache.
>
> This change splits the buffer cache free lists into lists of dma reachable
> buffers and high memory buffers based on the ranges returned by pmemrange.
> Buffers move from dma to high memory as they age, but are flipped to dma
> reachable memory if IO is needed to/from and high mem buffer. The total
> amount of buffers allocated is now bufcachepercent of both the dma and
> the high memory region.
>
> This change allows the use of large buffer caches on amd64 using more than
> 4 GB of memory
>
> ok tedu@ krw@ - testing by many.
I think it got reverted by:
commit ac77fb26761065b7f6031098e6a182cacfaf7437
Author: beck <b...@openbsd.org>
Date: Tue Jul 9 15:37:43 2013 +0000
back out the cache flipper temporarily to work out of tree.
will come back soon.
ok deraadt@
but I'm not an expert so would wait on confirmation by Bob Beck.
