Date: Sun, 29 Oct 1995 20:09:22 -0800 From: "Amancio Hasty Jr." <hasty@rah.star-gate.com> To: hackers@FreeBSD.ORG Subject: Buffer cache , lmbench part 3 Message-ID: <199510300409.UAA10427@rah.star-gate.com>
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Jim Lowe recorded the last space shuttle launch on his FreeBSD box;however, he ran into a minor gotcha the buffer cache. If you want to see the buffer cache in action just play the mpeg movie and look for pauses on on the movie. So the question now is: Is the buffer cache tuneble to avoid this kind of behavior? I was thinking that video capture without compression eats up enourmous amount of disk space so it would not be too unconceivable to bypass the file system and buffer cache and just do raw I/O to the disk. Here is a pointer to Jim's mpeg version of the space shuttle launch it is about 1.7mb and the original was 300MB : ftp://ftp.cs.uwm.edu/pub/shuttle_gifs/sts73.launch.mpg. Enjoy, Amancio
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