From owner-freebsd-hackers Sat Oct 7 16:35:50 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id QAA01640 for hackers-outgoing; Sat, 7 Oct 1995 16:35:50 -0700 Received: from Sysiphos (Sysiphos.MI.Uni-Koeln.DE [134.95.212.10]) by freefall.freebsd.org (8.6.12/8.6.6) with SMTP id QAA01632 for ; Sat, 7 Oct 1995 16:35:47 -0700 Received: by Sysiphos id AA14520 (5.67b/IDA-1.5 for hackers@freebsd.org); Sun, 8 Oct 1995 00:35:35 +0100 Message-Id: <199510072335.AA14520@Sysiphos> From: se@zpr.uni-koeln.de (Stefan Esser) Date: Sun, 8 Oct 1995 00:35:34 +0100 In-Reply-To: "Kenneth D. Merry" "Re: VLB Disk Controllers" (Oct 7, 19:13) X-Mailer: Mail User's Shell (7.2.6 alpha(2) 7/9/95) To: "Kenneth D. Merry" Subject: Re: VLB Disk Controllers Cc: hackers@freebsd.org Sender: owner-hackers@freebsd.org Precedence: bulk On Oct 7, 19:13, "Kenneth D. Merry" wrote: } Subject: Re: VLB Disk Controllers } Adaptec 2842 on a i486DX4/100 VLB (QUANTUM XP34300) (Atlas, fast disk) } output for disklatency /dev/rsd0: } Command overhead is 567 usec (time_4096 = 1002, time_8192 = 1438) } transfer speed is 9.40748e+06 bytes/sec Well, you beat me, though not by much :) But then, you used a DX4/100 ... Something I just noticed is the big difference in results I get using /dev/rsd0 vs. /dev/rsd0a: # disklatency /dev/rsd0 Command overhead is 719 usec (time_4096 = 1198, time_8192 = 1677) transfer speed is 8.55617e+06 bytes/sec # disklatency /dev/rsd0a Command overhead is 807 usec (time_4096 = 1272, time_8192 = 1738) transfer speed is 8.80588e+06 bytes/sec Any ideas ??? STefan -- Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 ============================================================================== http://www.zpr.uni-koeln.de/staff/esser/esser.html