Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 14 Dec 2001 07:54:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 14 Dec 2001 07:53:57 -0500 Received: from mailgw2a.lmco.com ([192.91.147.7]:64526 "EHLO mailgw2a.lmco.com") by vger.kernel.org with ESMTP id ; Fri, 14 Dec 2001 07:53:45 -0500 Content-return: allowed Date: Fri, 14 Dec 2001 07:53:18 -0500 From: "Needham, Douglas" Subject: RE: kernel performance issues 2.4.7 -> 2.4.17-pre8 To: "'Andrew Morton'" Cc: linux-kernel@vger.kernel.org Message-id: <1B7FCD9C07D3D4118FC500508BDF42E80457DFB6@emss09m02.ems.lmco.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: multipart/mixed; boundary="Boundary_(ID_WH+Mz3MkV3IDM5ACP2GE2w)" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --Boundary_(ID_WH+Mz3MkV3IDM5ACP2GE2w) Content-type: text/plain Content-transfer-encoding: 7BIT Thanks for the feed back. Here are my latest results re-running the same tests with the following enhancements. I also added .17-rc1. I did two things : the first was : echo 70 64 64 256 30000 3000 80 0 0 > /proc/sys/vm/bdflush the second was : hdparm -X66 -d1 -u1 -m16 -c3 /dev/hda following the document at : http://linux.oreillynet.com/lpt/a//linux/2000/06/29/hdparm.html I did see some performance gains, but My new questions are : Do we(people running Linux) need to do more work on tuning the hardware in the current kernels? >Note: before running the hdparm test on hda1, you should mount a 4k blocksize >filesystem onto hda1. Where could I find more info on how to do this? Wouldn't changing the blocksize of my file system kill my existing data? Or do I just need to create some filesystem on the device that has a 4k blocksize? I hate to ask a dumb question, but I had not heard of this being done before. Thanks, Doug -----Original Message----- From: Andrew Morton [mailto:akpm@zip.com.au] Sent: Thursday, December 13, 2001 2:50 PM To: Needham, Douglas Cc: linux-kernel@vger.kernel.org Subject: Re: kernel performance issues 2.4.7 -> 2.4.17-pre8 "Needham, Douglas" wrote: > > ... > Overall I discovered that the Red Hat modified kernel beat the stock > kernel hands down in throughput. Both the base Red Hat 7.2 kernel and the > 7.2 update kernel (2.4.7-9, 2.4.9-13 respectively) had far better throughput > than the .10, .15, .14, .16, and .17-pre8 kernels. > The 60% drop in bonnie throughput going from 2.4.9 to 2.4.10 indicates that something strange has happened. This hasn't been observed by others. My suspicion would be that something is wrong with the IDE tuning in your builds of later kernels. Please check this with `hdparm -t /dev/hda1' - make sure that these numbers are consistent across kernel versions before you even start. Note: before running the hdparm test on hda1, you should mount a 4k blocksize filesystem onto hda1. This changes the softblocksize for the device from 1k to 4k and, for some devices, speeds up access to the block device by a factor of thirty. This is some bizarro kooky brokenness which the 2.4.10 patch exposed and I'm still investigating... For dbench, errr, just don't bother using it, unless you're using a large number of clients - 64 or more. At lower client numbers, throughput is enormously dependent upon tiny changes in kernel behaviour. Try this: echo 70 64 64 256 30000 3000 80 0 0 > /proc/sys/vm/bdflush and see the numbers go up greatly. - - 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/ --Boundary_(ID_WH+Mz3MkV3IDM5ACP2GE2w) Content-type: application/octet-stream; name=results_1214.html.gz Content-disposition: attachment; filename=results_1214.html.gz Content-transfer-encoding: BASE64 H4sICPbzGTwAA3Jlc3VsdHNfMTIxNC5odG1sALRd0a4cR259D5B/mJcASRC3i6wi qyqwBcTZAHlIgMDYII+CVrqwhbUlQdJis/n6sK40VaXVncvTF/QCXgP2qD097C4e Hh4efvf7f/nhP/7t8oe371/dvf+eLi9+ef3Tm+9f3r35ePf+8ufXrz7+/L2klJ59 9/sf7a9/f3b54937N3e/XD7effh49+q7b+0f2T++vHz7y4d3L958T+nZ5dUf7t68 /Pn+Ex/sEh9/vrx78f7XC12O40Lp8uCf+Xj2z8izyw9v37x5fbf/mbv/ff3h4+s3 P11+vfv17fu/XD68/r+7f7rw5R9v/JsXb15dyo1/+/m/+e39fY+/fvf552hpfF/7 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