I am writing this mailing list to share my experiences with capturing
video with Linux onto SGI's XFS filesystem.
Information about SGI's XFS filesystem may be found at
http://linux-xfs.sgi.com/projects/xfs/.
I have been looking for a filesystem that meets two criteria: have
journaling functionality and be high performance. When I say high
performance, I mean able to kick ass at storing large files quickly,
as with capturing uncompressed video to disk.
I have tried ext2, reiserfs, and XFS.
Ext2 is not a journaling filesystem, though its performance seems good.
Reiserfs is a journaling filesystem, but its performance in my case was
not very good.
XFS is a journaling filesystem that seems to smoke both ext2 and reiserfs
in performance. So far I have found only two negatives related to XFS.
First, it has not been tested extensively by its developers with any
kernel other than 2.4.2. 2.4.2 suffers from loop-back device problems,
but I am sure XFS will support newer kernels soon. Second, XFS is huge;
the driver takes up hundreds of KBs of memory. This does not affect my
particular system, though.
For hardware, I have a 550Mhz Athlon, a 10,000 RPM SCSI hard drive, and
96 MB of RAM. I am using a cheap Hauppauge WinTV PCI video capture card.
Using XFS with this configuration, I am able to capture uncompressed
YUV2 encoded QuickTime video at 30 frames per second and a resolution
of 640x480 pixels. Neither ext2 or reiserfs seemed to be able to keep
up with this.
I would like to hear the experience of others with different filesystems
and capturing video. Would something like Linux's rawio interface be
useful in this field?
--
W. Michael Petullo
:wq
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