On Tue, Feb 20, 2007 at 09:12:38AM -0500, Bill Moran wrote: > In response to Volker <[EMAIL PROTECTED]>: > > > On 02/19/07 20:51, Kris Kennaway wrote: > > > On Mon, Feb 19, 2007 at 08:40:37PM +0100, Volker wrote: > > >> The tape sits there since 48 hours writing a block of data every > > >> other minute and still didn't fill up the tape completely. The > > >> system this is running on is a P-4 3GHz machine using FreeSBIE 2.0 > > >> (6.2-RELEASE based). > > >> > > >> I suspect this to be a slow /dev/random. > > > > > > This sounds odd to me, I get 18-20MB/sec sustained read performance > > > from /dev/random on this 2GHz system, which is probably faster than > > > your tape write speed. > > > > Hmm, so this might be the tape drive(r)? I'll check this out as soon > > as I'm going to write to hard disk. > > > > I'm going to make some tests with /dev/random to get the real speed. > > Are you actually using /dev/random and not /dev/urandom? > > /dev/random is "military grade" random data. It will block if it feels > that it hasn't gathered enough entropy to satisfy your request. It will > never provide random data at any reasonable speed, but it will provide > high-quality random data. > > If you need lost of random data, use /dev/urandom, which provides data > that _may_ be predictable under some circumstances, but will provide > it at a decent rate of speed.
Not true in a post 4.x world, they are symlinks and both "military grade" with non-blocking semantics. Kris _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
