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authorLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:46:49 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:46:49 -0800
commit4fa639123d9e6e8dfaa3d116368f4b2478da31af (patch)
tree50c42e2102a542891a15b5011e48fbde14149baf /Documentation
parentdf5b89b323b922f56650b4b4d7c41899b937cf19 (diff)
parentae36b883d29e53b6083ed3d1d44f254cee7507d3 (diff)
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Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block
* 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block: [PATCH] Don't make debugfs depend on DEBUG_KERNEL [PATCH] Fix blktrace compile with sysfs not defined [PATCH] unused label in drivers/block/cciss. [BLOCK] increase size of disk stat counters [PATCH] blk_execute_rq_nowait-speedup [PATCH] ide-cd: quiet down GPCMD_READ_CDVD_CAPACITY failure [BLOCK] ll_rw_blk: kmalloc -> kzalloc conversion [PATCH] kzalloc() conversion in drivers/block [PATCH] update max_sectors documentation
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/block/biodoc.txt14
1 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index 8e63831..f989a9e 100644
--- a/Documentation/block/biodoc.txt
+++ b/Documentation/block/biodoc.txt
@@ -132,8 +132,18 @@ Some new queue property settings:
limit. No highmem default.
blk_queue_max_sectors(q, max_sectors)
- Maximum size request you can handle in units of 512 byte
- sectors. 255 default.
+ Sets two variables that limit the size of the request.
+
+ - The request queue's max_sectors, which is a soft size in
+ in units of 512 byte sectors, and could be dynamically varied
+ by the core kernel.
+
+ - The request queue's max_hw_sectors, which is a hard limit
+ and reflects the maximum size request a driver can handle
+ in units of 512 byte sectors.
+
+ The default for both max_sectors and max_hw_sectors is
+ 255. The upper limit of max_sectors is 1024.
blk_queue_max_phys_segments(q, max_segments)
Maximum physical segments you can handle in a request. 128