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Re: [RFC] remove filestreams support?

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: [RFC] remove filestreams support?
From: Stewart Smith <stewart@xxxxxxxxxxxxxxxx>
Date: Tue, 05 Jul 2011 11:17:46 +1000
In-reply-to: <20110704153443.GA21501@xxxxxxxxxxxxx>
References: <20110704153443.GA21501@xxxxxxxxxxxxx>
User-agent: Notmuch/0.5-215-g5143e5e (http://notmuchmail.org) Emacs/23.2.1 (x86_64-pc-linux-gnu)
On Mon, 4 Jul 2011 11:34:43 -0400, Christoph Hellwig <hch@xxxxxxxxxxxxx> 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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