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Boaz Harrosh 7de6e28417 pnfs-obj: Better IO pattern in case of unaligned offset 
Depending on layout and ARCH, ORE has some limits on max IO sizes
which is communicated on (what else) ore_layout->max_io_length,
which is always stripe aligned.
This was considered as the pg_test boundary for splitting and starting
a new IO.

But in the case of a long IO where the start offset is not aligned
what would happen is that both end of IO[N] and start of IO[N+1]
would be unaligned, causing each IO boundary parity unit to be
calculated and written twice.

So what we do in this patch is split the very start of an unaligned
IO, up to a stripe boundary, and then next IO's can continue fully
aligned til the end.

We might be sacrificing the case where the full unaligned IO would
fit within a single max_io_length, but the sacrifice is well worth
the elimination of double calculation and parity units IO.
Actually the sacrificing is marginal and is almost unmeasurable.

TODO:
	If we know the total expected linear segment that will
	be received, at pg_init, we could use that information
	in many places:
	1. blocks-layout get_layout write segment size
	2. Better mds-threshold
	3. In above situation for a better clean split

	I will do this in future submission.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-08-02 17:42:51 -04:00
..
blocklayout pnfsblock: bail out partial page IO 2012-07-30 18:52:06 -04:00
objlayout pnfs-obj: Better IO pattern in case of unaligned offset 2012-08-02 17:42:51 -04:00
cache_lib.c NFS: remove RPC PipeFS mount point references from NFS cache routines 2012-01-31 18:20:26 -05:00
cache_lib.h NFS: DNS resolver PipeFS notifier introduced 2012-01-31 18:20:26 -05:00
callback.c nfs: increase number of permitted callback connections. 2012-07-31 12:33:29 -04:00
callback.h NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
callback_proc.c NFSv4: Further clean-ups of delegation stateid validation 2012-03-06 10:32:44 -05:00
callback_xdr.c SUNRPC: service request network namespace helper introduced 2012-07-27 16:49:21 -04:00
client.c NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
delegation.c NFS: Create a return_delegation rpc op 2012-06-29 11:46:45 -04:00
delegation.h NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
dir.c NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
direct.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
dns_resolve.c NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
dns_resolve.h NFS: DNS resolver cache per network namespace context introduced 2012-01-31 18:20:26 -05:00
file.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
fscache-index.c NFS: Use the inode->i_version to cache NFSv4 change attribute information 2011-10-18 09:14:34 -07:00
fscache.c NFS: Don't pass mount data to nfs_fscache_get_super_cookie() 2012-05-14 17:30:26 -07:00
fscache.h NFS: Fix a compile issue when CONFIG_NFS_FSCACHE was undefined 2012-05-16 10:24:20 -07:00
getroot.c NFS: Move the v4 getroot code to nfs4getroot.c 2012-07-17 13:33:51 -04:00
idmap.c NFS: Keep module parameters in the generic NFS client 2012-07-30 19:06:31 -04:00
inode.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
internal.h Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
iostat.h
Kconfig Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
Makefile NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
mount_clnt.c SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG 2012-03-20 13:08:26 -04:00
namespace.c NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
netns.h NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
nfs.h NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
nfs2super.c NFS: Convert v2 into a module 2012-07-30 19:06:41 -04:00
nfs2xdr.c NFS: Let xdr_read_pages() check for buffer overflows 2012-06-28 17:20:43 -04:00
nfs3acl.c NFS: Fix a number of sparse warnings 2012-03-11 15:14:16 -04:00
nfs3client.c NFS: Only initialize the ACL client in the v3 case 2012-07-30 19:05:54 -04:00
nfs3proc.c NFS: Only initialize the ACL client in the v3 case 2012-07-30 19:05:54 -04:00
nfs3super.c NFS: Convert v3 into a module 2012-07-30 19:06:46 -04:00
nfs3xdr.c NFS: Cleanup - only store the write verifier in struct nfs_page 2012-06-28 17:20:50 -04:00
nfs4_fs.h NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
nfs4client.c NFS: Keep module parameters in the generic NFS client 2012-07-30 19:06:31 -04:00
nfs4file.c NFS: Split out NFS v4 file operations 2012-07-17 13:33:50 -04:00
nfs4filelayout.c NFSv4.1 don't send LAYOUTCOMMIT if data resent through MDS 2012-07-16 14:37:00 -04:00
nfs4filelayout.h NFSv4.1 resend LAYOUTGET on data server invalid layout errors 2012-05-19 17:55:33 -04:00
nfs4filelayoutdev.c NFSv4.1: Use session max response size for GETDEVICEINFO gdia_maxcount 2012-06-28 17:20:50 -04:00
nfs4getroot.c NFS: Move the v4 getroot code to nfs4getroot.c 2012-07-17 13:33:51 -04:00
nfs4namespace.c Merge branch 'bugfixes' into nfs-for-next 2012-05-21 10:12:39 -04:00
nfs4proc.c pnfs: nfs4_proc_layoutget returns void 2012-08-02 17:39:06 -04:00
nfs4renewd.c NFS: Add NFSDBG_STATE 2012-05-22 16:45:42 -04:00
nfs4state.c NFS: Clean up nfs4_proc_setclientid() and friends 2012-07-16 15:12:16 -04:00
nfs4super.c NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
nfs4sysctl.c NFS: Initialize v4 sysctls from nfs_init_v4() 2012-07-17 13:33:18 -04:00
nfs4xdr.c NFS: Keep module parameters in the generic NFS client 2012-07-30 19:06:31 -04:00
nfsroot.c SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG 2012-03-20 13:08:26 -04:00
pagelist.c NFS41: add pg_layout_private to nfs_pageio_descriptor 2012-08-02 17:41:18 -04:00
pnfs.c pnfs: defer release of pages in layoutget 2012-08-02 17:38:54 -04:00
pnfs.h pnfs: nfs4_proc_layoutget returns void 2012-08-02 17:39:06 -04:00
pnfs_dev.c NFS: Fix more NFS debug related build warnings 2012-03-21 09:31:44 -04:00
proc.c NFS: Only initialize the ACL client in the v3 case 2012-07-30 19:05:54 -04:00
read.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
super.c NFS: Convert v4 into a module 2012-07-30 19:06:52 -04:00
symlink.c
sysctl.c NFS: Initialize v4 sysctls from nfs_init_v4() 2012-07-17 13:33:18 -04:00
unlink.c NFS: Create a return_delegation rpc op 2012-06-29 11:46:45 -04:00
write.c nfs: tear down caches in nfs_init_writepagecache when allocation fails 2012-08-02 17:36:07 -04:00