From owner-freebsd-hackers Sat Oct 7 16:17:59 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id QAA00396 for hackers-outgoing; Sat, 7 Oct 1995 16:17:59 -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 QAA00391 for ; Sat, 7 Oct 1995 16:17:56 -0700 Received: by Sysiphos id AA12212 (5.67b/IDA-1.5 for hackers@freebsd.org); Sun, 8 Oct 1995 00:17:51 +0100 Message-Id: <199510072317.AA12212@Sysiphos> From: se@zpr.uni-koeln.de (Stefan Esser) Date: Sun, 8 Oct 1995 00:17:50 +0100 In-Reply-To: "Justin T. Gibbs" "Re: VLB Disk Controllers" (Oct 7, 15:53) X-Mailer: Mail User's Shell (7.2.6 alpha(2) 7/9/95) To: "Justin T. Gibbs" Subject: Re: VLB Disk Controllers Cc: hackers@freebsd.org Sender: owner-hackers@freebsd.org Precedence: bulk On Oct 7, 15:53, "Justin T. Gibbs" wrote: } Subject: Re: VLB Disk Controllers } >IDE: 512/1815890 s + 573 us = 855 us } >NCR: 512/8799540 s + 751 us = 809 us } > } >Seems the NCR is faster on 512 byte transfers. } >Now I guess this is not really a "large i/o" :) } } What drive did you use for your tests? A Quantum XP32150 (2GB Atlas). But I've got values for a more "standard" 0.5GB drive as well (a DEC DSP3053L): Command overhead is 1161 usec (time_4096 = 1666, time_8192 = 2170) transfer speed is 8.12051e+06 bytes/sec (On my 486DX2/66 with NCR 53c810, again ...) 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