Date: Sat, 13 Oct 2001 12:00:39 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Jordan Hubbard <jkh@freebsd.org> Cc: jrossiter@symantec.com, sos@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: Severe I/O Problems Message-ID: <Pine.BSF.4.21.0110131158120.1529-100000@beppo> In-Reply-To: <20011012155746.R73308-100000@wonky.feral.com>
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> > Erm, this would make this the first report of "interference effects"
> > I've ever heard, certainly. Doesn't make it untrue, just subject to a
> > bit more initial skepticism. Is this truly the only variable that's
> > changing? Are we sure that the drives in question aren't simply
> > broken in some way and manifesting this behavior as an aberration
> > among IDE drives? Have different manufacturer's units been involved
> > in cross-testing? Thanks.
> >
> > - Jordan
Just following up myself on this... with a drive on my PC164 Alpha, the
realtime difference between two different checkouts of cvs src is interesting:
-------------
Script started on Sat Oct 13 10:07:07 2001
farrago.feral.com > # this is with wc off
farrago.feral.com > /usr/bin/time cvs -q -d /home/ncvs co src > LOG
2478.99 real 201.48 user 1046.87 sys
farrago.feral.com > exit
exit
Script done on Sat Oct 13 10:55:36 2001
Script started on Sat Oct 13 11:04:06 2001
farrago.feral.com > # this is with wc on
farrago.feral.com > /usr/bin/time cvs -q -d /home/ncvs co src > LOG
2866.82 real 199.92 user 988.24 sys
farrago.feral.com > exit
exit
Script done on Sat Oct 13 11:57:51 2001
-------------
All parameters were not totally lab controlled, but pretty close. I'd call it
significant enough that I'll leave WC off for this machine.
-matt
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