Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762487AbXF1LBX (ORCPT ); Thu, 28 Jun 2007 07:01:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758372AbXF1LBN (ORCPT ); Thu, 28 Jun 2007 07:01:13 -0400 Received: from hobbit.corpit.ru ([81.13.94.6]:24250 "EHLO hobbit.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758122AbXF1LBM (ORCPT ); Thu, 28 Jun 2007 07:01:12 -0400 Message-ID: <468394F3.2010909@msgid.tls.msk.ru> Date: Thu, 28 Jun 2007 15:01:07 +0400 From: Michael Tokarev User-Agent: Icedove 1.5.0.10 (X11/20070307) MIME-Version: 1.0 To: Michael Tokarev CC: Kernel Mailing List , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org Subject: Re: Some NCQ numbers... References: <468392CE.6010206@msgid.tls.msk.ru> In-Reply-To: <468392CE.6010206@msgid.tls.msk.ru> X-Enigmail-Version: 0.94.2.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2528 Lines: 63 Michael Tokarev wrote: [] > I'm planning to test several models of SCSI drives. On SCSI front > (or maybe with different drives - I don't know) things are WAY more > interesting wrt TCQ. Difference in results between 1 and 32 threads > goes up to 4 times sometimes!. But I'm a bit stuck with SCSI tests > since I don't know how to turn off TCQ without rebooting a machine. A quick followup, to demonstrate the "interesting" part. Seagate SCSI ST3146854LC drive, 140Gb, 15KRPM, write cache disabled, queue depth = 32: BlkSz Trd linRd rndRd linWr rndWr rndR/W 4k 1 37.9 0.6 0.9 0.6 0.4/ 0.3 4 0.9 0.7 0.6/ 0.4 32 1.5 1.1 0.9/ 0.4 8k 1 75.2 1.2 1.9 1.1 0.8/ 0.6 4 1.7 1.5 1.1/ 0.7 32 2.9 2.2 1.7/ 0.9 16k 1 82.3 2.4 3.6 2.3 1.5/ 1.2 4 3.3 2.9 2.2/ 1.4 32 5.5 4.3 3.3/ 1.7 32k 1 86.3 4.7 6.9 4.4 2.9/ 2.3 4 6.4 5.6 4.2/ 2.7 32 10.2 8.0 6.2/ 3.1 128k 1 86.5 15.8 26.6 14.9 9.5/ 7.7 4 20.6 18.2 13.5/ 8.5 32 29.2 24.8 18.3/ 9.1 1024k 1 88.6 46.7 63.1 48.2 25.3/25.3 4 51.7 51.3 33.5/21.8 32 55.9 57.3 37.6/19.0 Fujitsu SCSI MAX3147NC drive, same parameters: BlkSz Trd linRd rndRd linWr rndWr rndR/W 4k 1 37.4 0.7 1.0 0.6 0.4/ 0.3 4 0.9 0.8 0.6/ 0.4 32 1.5 1.2 0.9/ 0.4 8k 1 32.9 1.3 1.9 1.2 0.7/ 0.7 4 1.8 1.5 1.2/ 0.7 32 2.8 2.3 1.7/ 0.9 16k 1 89.6 2.6 3.7 2.4 1.4/ 1.3 4 3.5 3.0 2.4/ 1.4 32 5.4 4.4 3.3/ 1.7 32k 1 87.9 4.8 7.0 4.4 2.6/ 2.6 4 6.8 5.6 4.6/ 2.7 32 9.9 8.3 6.2/ 3.1 128k 1 90.7 16.2 22.5 15.3 8.6/ 8.6 4 21.8 18.6 15.0/ 8.1 32 28.6 25.0 18.2/ 9.1 1024k 1 90.6 48.9 60.0 47.4 25.3/25.9 4 55.6 51.7 34.4/22.5 32 59.8 56.2 38.6/19.7 /mjt - 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/