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@@ -282,9 +282,16 @@ stripe=n Number of filesystem blocks that mballoc will try
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to use for allocation size and alignment. For RAID5/6
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systems this should be the number of data
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disks * RAID chunk size in file system blocks.
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-delalloc (*) Deferring block allocation until write-out time.
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-nodelalloc Disable delayed allocation. Blocks are allocation
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- when data is copied from user to page cache.
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+
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+delalloc (*) Defer block allocation until just before ext4
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+ writes out the block(s) in question. This
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+ allows ext4 to better allocation decisions
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+ more efficiently.
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+nodelalloc Disable delayed allocation. Blocks are allocated
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+ when the data is copied from userspace to the
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+ page cache, either via the write(2) system call
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+ or when an mmap'ed page which was previously
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+ unallocated is written for the first time.
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max_batch_time=usec Maximum amount of time ext4 should wait for
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additional filesystem operations to be batch
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Jan Kara