From owner-freebsd-hackers Fri Feb 23 12:05:54 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id MAA05358 for hackers-outgoing; Fri, 23 Feb 1996 12:05:54 -0800 (PST) Received: from Sysiphos (Sysiphos.MI.Uni-Koeln.DE [134.95.212.10]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id MAA05348 for ; Fri, 23 Feb 1996 12:05:44 -0800 (PST) Received: by Sysiphos id AA07830 (5.67b/IDA-1.5 for hackers@freebsd.org); Fri, 23 Feb 1996 21:04:50 +0100 Message-Id: <199602232004.AA07830@Sysiphos> From: se@zpr.uni-koeln.de (Stefan Esser) Date: Fri, 23 Feb 1996 21:04:49 +0100 In-Reply-To: Rashid Karimov "Disk perf. with different HDs/Adapt." (Feb 23, 14:26) X-Mailer: Mail User's Shell (7.2.6 alpha(2) 7/9/95) To: Rashid Karimov Subject: Re: Disk perf. with different HDs/Adapt. Cc: hackers@freebsd.org Sender: owner-hackers@freebsd.org Precedence: bulk On Feb 23, 14:26, Rashid Karimov wrote: } Subject: Disk perf. with different HDs/Adapt. } Hi there folx, } } } Who are Today's Fastest ? :) } } } I mean the combination of motherboard/SCSI HD/SCI adapter } that delivers max perfomance ? max read/write speed etc ? } } } I have different values here on ASUS 133/166 Mhz P5, } 150/200Mhz PPro machines( with mucho deprecated PCI set) } and RAID Arrays. } } } For example } (command is: dd if=/dev/rsd0a of=/dev/null count=200 bs=64k) } } P166/ASUS/Aha2940(not wide,Seagate): } 13107200 bytes transferred in 2 secs (6553600 bytes/sec) If you report 'dd' numbers, then **please** add at least 'time' info ... E.g.: # time dd if=/dev/rsd0a of=/dev/null count=200 bs=64k 13107200 bytes transferred in 2 secs (6553600 bytes/sec) 1.92 real 0.01 user 0.05 sys # time dd if=/dev/rsd0c of=/dev/null count=800 bs=64k 52428800 bytes transferred in 8 secs (6553600 bytes/sec) 7.53 real 0.00 user 0.24 sys Those 1.92 seconds make for exactly 6826667 Bytes per second ... And the 7.43 give some 6962656 Bytes/s. (Yes, I know, the results aren't exact to more than 2 decimals due to the limited time resolution ...) BTW: Mine is an ASUS SP3G motherboard (NCR53c810, Quantum Atlas 2GB), hardly a competition to your P5 or P6 :) } P133(other stuff the same) } 52428800 bytes transferred in 8 secs (6553600 bytes/sec) } } P6-200Mhz(the same, runs INND and ~130 readers + 2 feeds } at the time of the test): } 13107200 bytes transferred in 3 secs (4369066 bytes/sec) } real slow comparing to the "regular" PCI chip like one } in P5 ASUSes } } P5-166(Bustec Wide SCSI, Seagate 32250W, under BSDI) - } ~8700000 bytes/sec That's one of the famous dual-head SCSI drives ? Will be beaten by the next generation of Fast-20 drives from all major vendors (Seagate, Quantum, IBM) which use MR head technology (net data rate of 12MB/s to 7MB/s). } P6-200 ASUS( hate it!) with RAID array ( all in HW no } special drivers reqd) - only 3Mb/sec ! Well, RAID doesn't seem the way to go, if you are looking for top performance ... Were the drives synchronized and was a reasonable write buffer in the controller ? How does CCD compare ? It was quite good according to the last values I saw ... Regards, 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/~se