From owner-freebsd-hardware Tue Jul 31 14:33:49 2001 Delivered-To: freebsd-hardware@freebsd.org Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by hub.freebsd.org (Postfix) with ESMTP id 6EFB537B401 for ; Tue, 31 Jul 2001 14:33:46 -0700 (PDT) (envelope-from gallatin@cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.9.3/8.9.3) with ESMTP id RAA00085; Tue, 31 Jul 2001 17:33:44 -0400 (EDT) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.11.3/8.9.1) id f6VLXFU01017; Tue, 31 Jul 2001 17:33:15 -0400 (EDT) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15207.9243.594273.686530@grasshopper.cs.duke.edu> Date: Tue, 31 Jul 2001 17:33:15 -0400 (EDT) To: Joerg Micheel Cc: hardware@freebsd.org Subject: Re: 3ware Escalade 7xxx supported? In-Reply-To: <20010801090829.B17381@cs.waikato.ac.nz> References: <3B6597A3.2EDC3A9C@we.lc.ehu.es> <200107310755.f6V7thd01635@mass.dis.org> <20010801090829.B17381@cs.waikato.ac.nz> X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Joerg Micheel writes: > On Tue, Jul 31, 2001 at 12:55:43AM -0700, Mike Smith wrote: > > > I did a simple read performance test (dd if=/dev/twed0 of=/dev/null bs=64k) > > > and I got about 55 MB/s. Hey, that's good :-) > > > > Yes. 8) > > What do people do if they need 60, 90 or 120 MByte/sec throughput ? > I have done some experiments with SCSI and there appears to be a > cap around 80 MByte/sec, regardless how many disks or controllers > are involved (not a strict FreeBSD problem, only). > If you're talking SCSI, get more SCSI buses. Since you said you were using multiple controllers, you're probably limited by a 32-bit/33MHz (132MB/sec) PCI bus, so get a faster bus. Eg, get a server with a 64-bit and/or a 66MHz bus. For example, on a dual-channel sym1010 card in a 64-bit / 33MHz PCI slot on a Dell PowerEdge 4400, we see roughly 23.5 MB/sec from 8 18 GB Cheetahs (ST318404LC) split evenly across the buses (or nearly 190MB/s) <5:22pm>apathy/gallatin:~>iostat -w 1 da0 da1 da2 da3 da4 da5 da6 da7 tty da0 da1 da2 da3 da4 da5 da6 da7 cpu tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id 0 2 64.00 1299 81.17 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 64.00 1299 81.17 0.00 0 0.00 0.00 0 0.00 0 0 0 0100 0 494 64.00 371 23.22 64.00 372 23.28 64.00 371 23.22 64.00 372 23.28 64.00 368 23.03 64.00 368 23.03 64.00 368 23.03 64.00 368 23.03 1 0 9 3 87 0 422 64.00 382 23.89 64.00 382 23.89 64.00 383 23.95 64.00 370 23.14 64.00 368 23.02 64.00 367 22.96 64.00 367 22.96 64.00 368 23.02 0 0 10 4 86 0 391 63.85 377 23.52 64.00 381 23.82 64.00 381 23.82 64.00 381 23.82 64.00 367 22.96 64.00 367 22.96 64.00 368 23.02 64.00 367 22.96 0 0 12 4 84 0 383 64.00 381 23.83 64.00 381 23.83 64.00 381 23.83 64.00 381 23.83 64.00 374 23.39 64.00 374 23.39 64.00 373 23.33 64.00 374 23.39 0 0 11 4 85 0 402 64.00 380 23.76 64.00 380 23.76 64.00 379 23.70 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 64.00 379 23.70 2 0 9 1 88 0 379 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 64.00 379 23.70 64.00 379 23.70 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 0 0 9 1 90 0 320 64.00 379 23.70 64.00 379 23.70 64.00 379 23.70 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 64.00 380 23.76 1 0 10 0 89 0 426 64.00 375 23.45 64.00 376 23.52 64.00 376 23.52 64.00 375 23.45 64.00 385 24.07 64.00 384 24.01 64.00 385 24.07 64.00 385 24.07 2 0 11 2 86 0 398 64.00 376 23.52 64.00 375 23.45 64.00 375 23.45 64.00 376 23.52 64.00 385 24.07 64.00 385 24.07 64.00 385 24.07 64.00 385 24.07 0 0 11 4 85 ^C This is up from using the on-board aic7899, which is behind a ppb on a 32-bit / 33MHz bus (!!) on the 4400 & we never saw more than 100MB/sec from it. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message