Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751174AbVK3WoZ (ORCPT ); Wed, 30 Nov 2005 17:44:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751178AbVK3WoZ (ORCPT ); Wed, 30 Nov 2005 17:44:25 -0500 Received: from xproxy.gmail.com ([66.249.82.198]:59604 "EHLO xproxy.gmail.com") by vger.kernel.org with ESMTP id S1751174AbVK3WoY convert rfc822-to-8bit (ORCPT ); Wed, 30 Nov 2005 17:44:24 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=ofjTydSeDaywa6zs7E4a+6x5KbdYLSftNJ4+iH+qE6HyAu3XhNbtbqNNTazgiRumNXywGLfH5PEMLCiDiZMXnMUFy0Wlo1qLpYWawh7WJVrFMqyMRUJIHj5ZoW3krVLvssjE2FTxJiRMQrLPYA7vUH9gy6Whg90hrOPdaax1r5U= Message-ID: <9a8748490511301444h49bfd8f0r55150951ed5ebc2b@mail.gmail.com> Date: Wed, 30 Nov 2005 23:44:23 +0100 From: Jesper Juhl To: art@usfltd.com Subject: Re: SCSI adaptec 19160 speed - 2.6.14-rt13 - Q for scsi experts Cc: linux-kernel@vger.kernel.org, lsorense@csclub.uwaterloo.ca In-Reply-To: <200511301617.AA133431912@usfltd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <200511301617.AA133431912@usfltd.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5270 Lines: 133 On 11/30/05, art wrote: > Re: SCSI adaptec 19160 speed - 2.6.14-rt13 - Q for scsi experts > > On Tue, Nov 29, 2005 at 07:36:44PM -0600, art wrote: [snip] > > > > > > # hdparm -tT /dev/sdb > > > /dev/sdb: > > > Timing cached reads: 2316 MB in 2.00 seconds = 1157.90 MB/sec > > > Timing buffered disk reads: 268 MB in 3.00 seconds = 89.26 MB/sec > > > # hdparm -tT /dev/sdc > > > > > > /dev/sdc: > > > Timing cached reads: 2512 MB in 2.00 seconds = 1255.49 MB/sec > > > Timing buffered disk reads: 268 MB in 3.00 seconds = 89.32 MB/sec > > > > > > # hdparm -tT /dev/sdb & hdparm -tT /dev/sdc & > > > [1] 3314 > > > [2] 3315 > > > > > > /dev/sdb: > > > /dev/sdc: > > > Timing cached reads: Timing cached reads: 1228 MB in 2.00 seconds = 613.88 MB/sec > > > 1316 MB in 1.99 seconds = 659.73 MB/sec > > > Timing buffered disk reads: Timing buffered disk reads: > > > 174 MB in 3.00 seconds = 57.91 MB/sec > > > 170 MB in 3.05 seconds = 55.75 MB/sec > > > ------------------------------------------------------------------------------------------ > > > > > > pci is 66Mhz theoretical throuhput ~ 250MB/s > > And pci at 33mhz can do 130MB/s or so. With a bit over overhead those > numbers sure look awful close to what a 33mhz pci bus can handle. > > > > controller adaptec asc-19160 > > > discs are 146GB-15krpm-cheetah > > > > > > one disc transfer 89MB/s > > > > > > adaptec speed with 2 disc on one channel = 57.91+55.75 = 113.66MB/s > > > > > > 71% of 160MB/s channel speed i expected ~90% > > > > > > any clue? > > PCI bus not at 66mhz perhaps? Is it an add in card on onboard? I > wonder if a pci bus that supports 66mhz has to drop everything to 33mhz > if any of the cards installed are 33mhz only. Having never tried I > don't know. > > Len Sorensen > > -------------------------------------------------------------- > -------------------------------------------------------------- > > # /sbin/lspci -v > > 02:00.0 SCSI storage controller: Adaptec AIC-7892B U160/m (rev 02) > Subsystem: Adaptec 19160 Ultra160 SCSI Controller > Flags: bus master, 66Mhz, medium devsel, latency 32, IRQ 16 > BIST result: 00 > I/O ports at a000 [disabled] [size=256] > Memory at e302a000 (64-bit, non-prefetchable) [size=4K] > [virtual] Expansion ROM at 50000000 [disabled] [size=128K] > Capabilities: [dc] Power Management version 2 > > 02:02.2 USB Controller: NEC Corporation USB 2.0 (rev 04) (prog-if 20 [EHCI]) > Subsystem: Belkin Root Hub > Flags: bus master, medium devsel, latency 32, IRQ 16 > Memory at e3028000 (32-bit, non-prefetchable) [size=256] > Capabilities: [40] Power Management version 2 > > 02:04.0 FireWire (IEEE 1394): Texas Instruments TSB43AB23 IEEE-1394a-2000 Controller (PHY/Link) (prog-if 10 [OHCI]) > Subsystem: Adaptec: Unknown device 0030 > Flags: bus master, medium devsel, latency 32, IRQ 16 > Memory at e302b000 (32-bit, non-prefetchable) [size=2K] > Memory at e3020000 (32-bit, non-prefetchable) [size=16K] > Capabilities: [44] Power Management version 2 > > > 3 cards on same 16-int Adaptec 19160 at 66Mhz > but---33Mhz ieee1394a ---- subsystem: Adaptec ??? > Hmm, seeing your mail got me thinking about how my own disks perform # lspci -v 00:0b.0 SCSI storage controller: Adaptec AIC-7892A U160/m (rev 02) Subsystem: Adaptec 29160N Ultra160 SCSI Controller Flags: bus master, 66Mhz, medium devsel, latency 32, IRQ 5 BIST result: 00 I/O ports at 9800 [disabled] [size=256] Memory at e3000000 (64-bit, non-prefetchable) [size=4K] Expansion ROM at 30000000 [disabled] [size=128K] Capabilities: [dc] Power Management version 2 about the disk (10K RPM IBM UltraStar) from dmesg : [ 43.387178] Vendor: IBM Model: DDYS-T36950N Rev: S96H [ 43.406176] Type: Direct-Access ANSI SCSI revision: 03 [ 43.424651] scsi0:A:6:0: Tagged Queuing enabled. Depth 200 [ 43.442952] target0:0:6: Beginning Domain Validation [ 43.464011] target0:0:6: wide asynchronous. [ 43.486866] target0:0:6: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63) [ 43.514788] target0:0:6: Ending Domain Validation [ 45.584696] SCSI device sda: 71687340 512-byte hdwr sectors (36704 MB) [ 45.604490] SCSI device sda: drive cache: write back [ 45.623781] SCSI device sda: 71687340 512-byte hdwr sectors (36704 MB) [ 45.643575] SCSI device sda: drive cache: write back [ 45.661953] sda: sda1 sda2 sda3 sda4 [ 45.691968] sd 0:0:6:0: Attached scsi disk sda # hdparm -tT /dev/sda /dev/sda: Timing cached reads: 904 MB in 2.00 seconds = 451.17 MB/sec Timing buffered disk reads: 84 MB in 3.05 seconds = 27.52 MB/sec Not exactely impressive numbers here... -- Jesper Juhl Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/