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authorAndreas Gerstmayr <andreas.gerstmayr@catalysts.cc>2017-01-10 14:17:56 +0100
committerIlya Dryomov <idryomov@gmail.com>2017-02-20 12:16:05 +0100
commit7c94ba27903c3c46c5829e96efb7c2a8ab7510e9 (patch)
treeffbc7ec7dfc898703ef368c71288a20b9e14a7aa /Documentation
parent0fbc5360bf433ffeccbb94ef806d637049899741 (diff)
downloadlinux-7c94ba27903c3c46c5829e96efb7c2a8ab7510e9.tar.gz
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.txt5
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/filesystems/ceph.txt b/Documentation/filesystems/ceph.txt
index f5306ee..0b302a1 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