raw device access under Linux
keithp at keithp.com
Tue Nov 6 00:30:13 CET 2001
Around 14 o'clock on Nov 5, "Jeffrey W. Baker" wrote:
> The raw device is a hack around the bad buffer cache handling in the
> earlier 2.4 kernels. With the latest 2.4 kernels it really shouldn't be
> necessary. Sequential read-once input doesn't pollute the buffer cache
> like it used to.
That's good news; I noticed a serious performance problem because of this.
Of course, raw device access is still a tiny bit more efficient as it
avoids another copy, but at DVD rates that's hardly worth bothering for.
I haven't used the buffered device on 2.4.13 yet to see what it does.
keithp at keithp.com XFree86 Core Team SuSE, Inc.
More information about the vlc-devel