Date: Fri, 18 Apr 1997 13:00:41 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Cc: dufault@hda.com, hackers@freebsd.org Subject: Re: video capture driver interface to file system? Message-ID: <199704182000.NAA02654@phaeton.artisoft.com> In-Reply-To: <199704181044.MAA08521@labinfo.iet.unipi.it> from "Luigi Rizzo" at Apr 18, 97 12:44:39 pm
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> probably the latter :) > > I have IDE disks (WD Caviar) streming files at about 3MB/s (sustained > over about 10 minutes) with a Pentium 133 running "tv" at the same > time. Even if the raw disk speed would go up to 10MB/s I doubt the copy > overhead would barely slow down the process on a PPro. For what it's worth, we heavily profiled the entire FS framework, and by far the biggest overhead was the (~80%) time spent in the copy in uiomove() (there was a lot of time spent waiting for the driver to do its job, but that's not accounted against the process). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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