From owner-freebsd-hackers Mon Oct 9 08:33:18 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id IAA13726 for hackers-outgoing; Mon, 9 Oct 1995 08:33:18 -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 IAA13717 for ; Mon, 9 Oct 1995 08:32:59 -0700 Received: by Sysiphos id AA00468 (5.67b/IDA-1.5 for hackers@freebsd.org); Mon, 9 Oct 1995 16:31:42 +0100 Message-Id: <199510091531.AA00468@Sysiphos> From: se@zpr.uni-koeln.de (Stefan Esser) Date: Mon, 9 Oct 1995 16:31:42 +0100 In-Reply-To: "Jonathan M. Bresler" "Re: VLB Disk Controllers" (Oct 8, 18:01) X-Mailer: Mail User's Shell (7.2.6 alpha(2) 7/9/95) To: "Jonathan M. Bresler" Subject: Re: VLB Disk Controllers Cc: hackers@freebsd.org Sender: owner-hackers@freebsd.org Precedence: bulk On Oct 8, 18:01, "Jonathan M. Bresler" wrote: } Subject: Re: VLB Disk Controllers } On Mon, 9 Oct 1995, Bruce Evans wrote: Seems you got disk_latency.c meanwhile ... (Didn't go to work on Sunday, so I couldn't reply earlier :) } > >> > transfer speed is 1.25286e+07 bytes/sec } > } > >heh? } > >how do you get 12MB/sec on a 10MB/sec SCSI bus? } } well how about these numbers (dont sweat them, i have not yet } created the sd1sX devices) } } ./disklatency /dev/rsd1f } Command overhead is 11092 usec (time_4096 = 11098, time_8192 = 11104) } transfer speed is 6.88982e+08 bytes/sec } Aspen: {258} !! } ./disklatency /dev/rsd1f } Command overhead is 6270 usec (time_4096 = 4104, time_8192 = 1938) } transfer speed is -1.891e+06 bytes/sec } Aspen: {259} !! } ./disklatency /dev/rsd1f } Command overhead is 10991 usec (time_4096 = 11098, time_8192 = 11204) } transfer speed is 3.84637e+07 bytes/sec } Aspen: {260} !! } ./disklatency /dev/rsd1f } Command overhead is 11065 usec (time_4096 = 11120, time_8192 = 11175) } transfer speed is 7.4424e+07 bytes/sec What controller is that ? 11ms seems very long, but that is what I got on our Sparc10 servers running SunOS 4.1.3 as well (on 4GB Barracuda II drives !) 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