On Mon, 4 Jul 2011 11:34:43 -0400, Christoph Hellwig [off-list ref] wrote:

I'd like to know if there are any people actively using the filestreams
support in XFS (-o filestreams).  It's pretty much a fringe feature, and
I've not seen any user reports for it, while it never passes all its
XFSQA tests reliably.  It was added specificly for CXFS media streaming
operations on one particular array model that hasn't been sold for a
long time.  The feature purely is an in-memory one so unlike for example
the realtime device there are no issue about beeing able to read old
filesystems.  The filestreams specific files are around 1500 lines of
code, not even counting the hooks in the core XFS codebase.

I used it a bit on MythTV box to help circumvent the stupid behaviour of
it fsync()ing every second[1] leading to poor file layout on disk. I
found that filestreams worked a bit better than just setting allocsize
mount option... but I wouldn't be screaming too much if it went away....


[1] which was to work around ext3 taking locks for so long that you'd
then miss part of your TV program

-- 
Stewart Smith

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