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| author | Andreas Gerstmayr <andreas.gerstmayr@catalysts.cc> | 2017-01-10 14:17:56 +0100 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2017-02-20 12:16:05 +0100 |
| commit | 7c94ba27903c3c46c5829e96efb7c2a8ab7510e9 (patch) | |
| tree | ffbc7ec7dfc898703ef368c71288a20b9e14a7aa /Documentation | |
| parent | 0fbc5360bf433ffeccbb94ef806d637049899741 (diff) | |
| download | linux-7c94ba27903c3c46c5829e96efb7c2a8ab7510e9.tar.gz linux-7c94ba27903c3c46c5829e96efb7c2a8ab7510e9.tar.bz2 linux-7c94ba27903c3c46c5829e96efb7c2a8ab7510e9.zip | |
ceph: set io_pages bdi hint
This patch sets the io_pages bdi hint based on the rsize mount option.
Without this patch large buffered reads (request size > max readahead)
are processed sequentially in chunks of the readahead size (i.e. read
requests are sent out up to the readahead size, then the
do_generic_file_read() function waits until the first page is received).
With this patch read requests are sent out at once up to the size
specified in the rsize mount option (default: 64 MB).
Signed-off-by: Andreas Gerstmayr <andreas.gerstmayr@catalysts.cc>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/ceph.txt | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/filesystems/ceph.txt b/Documentation/filesystems/ceph.txt index f5306ee40ea9..0b302a11718a 100644 --- a/Documentation/filesystems/ceph.txt +++ b/Documentation/filesystems/ceph.txt @@ -98,11 +98,10 @@ Mount Options size. rsize=X - Specify the maximum read size in bytes. By default there is no - maximum. + Specify the maximum read size in bytes. Default: 64 MB. rasize=X - Specify the maximum readahead. + Specify the maximum readahead. Default: 8 MB. mount_timeout=X Specify the timeout value for mount (in seconds), in the case |