Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!sharkey!mcf!mibte!gamma!thumper!ulysses!andante!alice!debra
From: debra@alice.UUCP (Paul De Bra)
Newsgroups: comp.unix.i386,comp.unix.questions
Subject: Re: ISC 386/ix sysadm filemgmt facilities & cpio
Keywords: backup restore cpio store
Message-ID: <9754@alice.UUCP>
Date: 6 Aug 89 18:02:23 GMT
References: <266@phavl.UUCP>
Reply-To: debra@alice.UUCP ()
Organization: AT&T, Bell Labs
Lines: 25

In article <266@phavl.UUCP> rob@phavl.UUCP (Robert Ransbottom) writes:
}...
}Incidentally -- on a Dell System 310 (20Mhz & 4Meg) under 386/ix
}r2.0.1 with a 60Meg Wangtek -- empirical testing with
}...
}
}yields the following:
}
} $Opts                  Megs/Minute
} -ovcC262144            0.42
} -ovcC102400            3.18
}...

Yep, don't forget the bug in cpio which multiplies the buffer size by
10.
102400 gives you 1024000 bytes, a nice size for smooth transfer.
262144 gives you 2621440 bytes, which, after adding kernel exceeds
your physical memory. As a result your system starts paging a lot,
probably on the same disk cpio is trying to read from...

Paul.
-- 
------------------------------------------------------
|debra@research.att.com   | uunet!research!debra     |
------------------------------------------------------