Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270255AbTGWNFe (ORCPT ); Wed, 23 Jul 2003 09:05:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270262AbTGWNFd (ORCPT ); Wed, 23 Jul 2003 09:05:33 -0400 Received: from dsl2.external.hp.com ([192.25.206.7]:59399 "EHLO dsl2.external.hp.com") by vger.kernel.org with ESMTP id S270255AbTGWNFc (ORCPT ); Wed, 23 Jul 2003 09:05:32 -0400 Date: Wed, 23 Jul 2003 07:20:37 -0600 From: Grant Grundler To: "David S. Miller" Cc: grundler@parisc-linux.org, ak@suse.de, alan@lxorguk.ukuu.org.uk, James.Bottomley@SteelEye.com, axboe@suse.de, suparna@in.ibm.com, linux-kernel@vger.kernel.org, alex_williamson@hp.com, bjorn_helgaas@hp.com Subject: Re: [RFC] block layer support for DMA IOMMU bypass mode II Message-ID: <20030723132037.GA30550@dsl2.external.hp.com> References: <20030708213427.39de0195.ak@suse.de> <20030708.150433.104048841.davem@redhat.com> <20030708222545.GC6787@dsl2.external.hp.com> <20030708.152314.115928676.davem@redhat.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="2B/JsCI69OhZNC5r" Content-Disposition: inline In-Reply-To: <20030708.152314.115928676.davem@redhat.com> User-Agent: Mutt/1.3.28i X-Home-Page: http://www.parisc-linux.org/ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2713 Lines: 70 --2B/JsCI69OhZNC5r Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Jul 08, 2003 at 03:23:14PM -0700, David S. Miller wrote: > dbench type stuff, realizing dbench is blissfully ignorant of the system (2GB RAM), for grins I ran "dbench 500" to see what would happen. The throughput rate dbench reported continued to decline to ~20MB/s. This is about what I would expect for one disk a 40MB/s SCSI bus. Then dbench started spewing errors: ... (7) ERROR: handle 13781 was not found (6) open clients/client428 failed for handle 13781 (No such file or directory) (7) ERROR: handle 13781 was not found (6) open clients/client423 failed for handle 13781 (No such file or directory) (7) ERROR: handle 13781 was not found (6) open clients/client48 failed for handle 13781 (No such file or directory) (7) ERROR: handle 13781 was not found (6) open clients/client55 failed for handle 13781 (No such file or directory) (7) ERROR: handle 13781 was not found (6) open clients/client419 failed for handle 13781 (No such file or directory) (7) ERROR: handle 13781 was not found (6) open clients/client415 failed for handle 13781 (No such file or directory) ... write failed on handle 13783 write failed on handle 13707 write failed on handle 13808 write failed on handle 13117 write failed on handle 13850 write failed on handle 14000 write failed on handle 13767 write failed on handle 13787 ... NFC what that's all about. sorry - I have to punt on digging deeper. I really need more guidance on (a) how much memory I should be testing with (b) how many spindles would be useful (I've got ~15 on each box) (c) how to tell dbench to use the FS mounted on the target disks. I've attached the iommu stats in case anyone finds that useful. grant --2B/JsCI69OhZNC5r Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename=dbench-zx1-01 Hewlett Packard zx1 IOC rev 2.2 IO PDIR size : 524288 bytes (65536 entries) IO PDIR entries : 65224 free 312 used (0%) Resource bitmap : 8192 bytes (65536 pages) Bitmap search : 63/106/605 (min/avg/max CPU Cycles) pci_map_single(): 139846 calls 139881 pages (avg 1000/1000) pci_unmap_single: 473108 calls 736788 pages (avg 1557/1000) pci_map_sg() : 51256 calls 597211 pages (avg 11651/1000) pci_map_sg() : 734319 entries 333551 filled pci_unmap_sg() : 189496 calls 735471 pages (avg 3881/1000) --2B/JsCI69OhZNC5r-- - 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/