From owner-freebsd-hackers Sat Oct 13 12: 0:48 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from beppo.feral.com (beppo.feral.com [192.67.166.79]) by hub.freebsd.org (Postfix) with ESMTP id 72EB437B40B; Sat, 13 Oct 2001 12:00:40 -0700 (PDT) Received: from mailhost.feral.com (mjacob@mailhost.feral.com [192.67.166.1]) by beppo.feral.com (8.11.3/8.11.3) with ESMTP id f9DJ0dH01847; Sat, 13 Oct 2001 12:00:39 -0700 (PDT) (envelope-from mjacob@feral.com) Date: Sat, 13 Oct 2001 12:00:39 -0700 (PDT) From: Matthew Jacob X-Sender: mjacob@beppo Reply-To: mjacob@feral.com To: Jordan Hubbard Cc: jrossiter@symantec.com, sos@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: Severe I/O Problems In-Reply-To: <20011012155746.R73308-100000@wonky.feral.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > > 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message