From owner-freebsd-hackers Sat Dec 31 23:55:25 1994 Return-Path: hackers-owner Received: (from root@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id XAA03300 for hackers-outgoing; Sat, 31 Dec 1994 23:55:25 -0800 Received: from gndrsh.aac.dev.com (gndrsh.aac.dev.com [198.145.92.241]) by freefall.cdrom.com (8.6.9/8.6.6) with ESMTP id XAA03294 for ; Sat, 31 Dec 1994 23:55:22 -0800 Received: (from rgrimes@localhost) by gndrsh.aac.dev.com (8.6.8/8.6.6) id XAA16921; Sat, 31 Dec 1994 23:54:59 -0800 From: "Rodney W. Grimes" Message-Id: <199501010754.XAA16921@gndrsh.aac.dev.com> Subject: Re: rdump is slow To: sef@kithrup.com (Sean Eric Fagan) Date: Sat, 31 Dec 1994 23:54:59 -0800 (PST) Cc: hackers@freebsd.org In-Reply-To: <199501010722.XAA24011@kithrup.com> from "Sean Eric Fagan" at Dec 31, 94 11:22:56 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Content-Length: 897 Sender: hackers-owner@freebsd.org Precedence: bulk > > Has anybody sat down and tried to figure out why? > > (rdump is taking about six hours to dump <700MBytes across an ethernet; > doing about the same amount, spread over different filesystems, takes about > 30-45 minutes locally, to the same tape drive.) > > It could be due to the ethernet, I suppose, but... I think it unlikely. > > Any comments? First thing I would look at would be I/O blocking sizes, are large blocks being transfered over the ethernet, and are large blocks being written to the tape. The numbers you are seeing are not what I am use to seeing with rdump when I was using it under 1.1 to dump freefall to 4mm DAT tape at cdrom.com, use to get about 250KB/sec or 15MB/minute or 700MB in 46 minutes.... > Sean. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD