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c128e575514ce93dced349417d136304a33b6f99
linux/fs/nfs
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Trond Myklebust c128e57551 NFS: Optimise the default readahead size 
In the years since the max readahead size was fixed in NFS, a number of
things have happened:
- Users can now set the value directly using /sys/class/bdi
- NFS max supported block sizes have increased by several orders of
  magnitude from 64K to 1MB.
- Disk access latencies are orders of magnitude faster due to SSD + NVME.

In particular note that if the server is advertising 1MB as the optimal
read size, as that will set the readahead size to 15MB.
Let's therefore adjust down, and try to default to VM_READAHEAD_PAGES.
However let's inform the VM about our preferred block size so that it
can choose to round up in cases where that makes sense.

Reported-by: Alkis Georgopoulos <alkisg@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-09-24 15:58:20 -04:00
..
blocklayout
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
filelayout
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
flexfilelayout
pnfs/flexfiles: Add tracepoints for detecting pnfs fallback to MDS
2019-07-18 15:50:28 -04:00
cache_lib.c
Merge tag 'nfs-for-4.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2017-11-17 14:18:00 -08:00
cache_lib.h
Merge tag 'nfs-for-4.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2017-11-17 14:18:00 -08:00
callback_proc.c
NFS4: Add a trace event to record invalid CB sequence IDs
2019-07-09 10:30:25 -04:00
callback_xdr.c
SUNRPC/nfs: Fix return value for nfs4_callback_compound()
2019-04-24 09:46:34 -04:00
callback.c
SUNRPC: Cache the process user cred in the RPC server listener
2019-04-24 09:46:35 -04:00
callback.h
NFS CB_OFFLOAD xdr
2018-08-09 12:56:38 -04:00
client.c
NFS: Cleanup if nfs_match_client is interrupted
2019-07-06 14:54:53 -04:00
delegation.c
NFSv4.1: Only reap expired delegations
2019-08-04 22:35:40 -04:00
delegation.h
NFSv4: Fix delegation state recovery
2019-08-04 22:35:40 -04:00
dir.c
NFS: remove unused check for negative dentry
2019-09-20 15:15:24 -04:00
direct.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
dns_resolve.c
keys: Pass the network namespace into request_key mechanism
2019-06-27 23:02:12 +01:00
dns_resolve.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
export.c
NFS: Pass the inode down to the getattr() callback
2018-06-04 12:07:07 -04:00
file.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
fscache-index.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
fscache.c
NFS: Fix regression whereby fscache errors are appearing on 'nofsc' mounts
2019-08-04 22:35:41 -04:00
fscache.h
NFS: Fix regression whereby fscache errors are appearing on 'nofsc' mounts
2019-08-04 22:35:41 -04:00
getroot.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
inode.c
Merge branch 'containers'
2019-07-06 14:54:52 -04:00
internal.h
NFS: Optimise the default readahead size
2019-09-24 15:58:20 -04:00
io.c
NFS: Fix up documentation warnings
2019-02-20 15:14:21 -05:00
iostat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kconfig
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
Makefile
NFS: Create a root NFS directory in /sys/fs/nfs
2019-07-06 14:54:49 -04:00
mount_clnt.c
SUNRPC: Cache cred of process creating the rpc_client
2019-04-26 16:00:48 -04:00
namespace.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
netns.h
NFS: Add sysfs support for per-container identifier
2019-07-06 14:54:49 -04:00
nfs2super.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
nfs2xdr.c
NFS: Record task, client ID, and XID in xdr_status trace points
2019-07-09 10:30:25 -04:00
nfs3_fs.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nfs3acl.c
nfs: fix xfstest generic/099 failed on nfsv3
2019-02-20 17:33:55 -05:00
nfs3client.c
pNFS: Allow multiple connections to the DS
2019-07-06 14:54:50 -04:00
nfs3proc.c
NFSv3: use nfs_add_or_obtain() to create and reference inodes
2019-09-20 15:15:24 -04:00
nfs3super.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
nfs3xdr.c
NFS: Record task, client ID, and XID in xdr_status trace points
2019-07-09 10:30:25 -04:00
nfs4_fs.h
NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE
2019-09-20 15:56:19 -04:00
nfs4client.c
NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim()
2019-08-04 22:35:40 -04:00
nfs4file.c
Merge tag 'nfs-for-5.3-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2019-07-18 14:32:33 -07:00
nfs4getroot.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nfs4idmap.c
Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs"
2019-07-10 18:43:43 -07:00
nfs4idmap.h
NFS: Move nfs_idmap.h into fs/nfs/
2015-04-23 15:16:14 -04:00
nfs4namespace.c
NFS: Fix up documentation warnings
2019-02-20 15:14:21 -05:00
nfs4proc.c
NFSv4: Handle NFS4ERR_OLD_STATEID in LOCKU
2019-09-20 16:00:14 -04:00
nfs4renewd.c
NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.
2018-12-19 13:52:46 -05:00
nfs4session.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
nfs4session.h
NFSv4.1: Bump the default callback session slot count to 16
2019-03-02 16:25:26 -05:00
nfs4state.c
NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE
2019-09-20 15:56:19 -04:00
nfs4super.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
nfs4sysctl.c
nfs: Do not convert nfs_idmap_cache_timeout to jiffies
2018-01-18 15:10:47 -05:00
nfs4trace.c
pnfs/flexfiles: Add tracepoints for detecting pnfs fallback to MDS
2019-07-18 15:50:28 -04:00
nfs4trace.h
pnfs/flexfiles: Add tracepoints for detecting pnfs fallback to MDS
2019-07-18 15:50:28 -04:00
nfs4xdr.c
fs: nfs: Fix possible null-pointer dereferences in encode_attrs()
2019-08-20 09:30:50 -04:00
nfs42.h
NFSv4.2: Add client support for the generic 'layouterror' RPC call
2019-03-01 16:20:16 -05:00
nfs42proc.c
NFSv4.1 fix incorrect return value in copy_file_range
2019-04-11 15:23:48 -04:00
nfs42xdr.c
NFSv4.2: Add client support for the generic 'layouterror' RPC call
2019-03-01 16:20:16 -05:00
nfs.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nfsroot.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nfstrace.c
NFS: Add trace events to report non-zero NFS status codes
2019-02-13 12:03:21 -05:00
nfstrace.h
NFS: Record task, client ID, and XID in xdr_status trace points
2019-07-09 10:30:25 -04:00
pagelist.c
NFS: Clean up writeback code
2019-07-06 14:54:52 -04:00
pnfs_dev.c
NFS/flexfiles: Speed up read failover when DSes are down
2019-03-01 22:37:38 -05:00
pnfs_nfs.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
pnfs.c
pNFS: Handle NFS4ERR_OLD_STATEID on layoutreturn by bumping the state seqid
2019-09-20 15:48:35 -04:00
pnfs.h
pNFS: Handle NFS4ERR_OLD_STATEID on layoutreturn by bumping the state seqid
2019-09-20 15:48:35 -04:00
proc.c
NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.
2018-12-19 13:52:46 -05:00
read.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
super.c
NFS: Optimise the default readahead size
2019-09-24 15:58:20 -04:00
symlink.c
nfs: pass the correct prototype to read_cache_page
2019-05-09 16:26:57 -04:00
sysctl.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sysfs.c
NFS: Add sysfs support for per-container identifier
2019-07-06 14:54:49 -04:00
sysfs.h
NFS: Add sysfs support for per-container identifier
2019-07-06 14:54:49 -04:00
unlink.c
fsnotify: move fsnotify_nameremove() hook out of d_delete()
2019-06-20 14:47:44 +02:00
write.c
NFS: Clean up writeback code
2019-07-06 14:54:52 -04:00