From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pat LaVarre Subject: Re: zeroes read back more often than appended Date: 26 Nov 2003 17:45:04 -0700 Sender: linux-fsdevel-owner@vger.kernel.org Message-ID: <1069893904.4318.18.camel@patrh9> References: <1069346480.6663.37.camel@patrh9> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from email-out1.iomega.com ([147.178.1.82]:25323 "EHLO email.iomega.com") by vger.kernel.org with ESMTP id S264394AbTK0Apg (ORCPT ); Wed, 26 Nov 2003 19:45:36 -0500 Received: from royntex01.iomegacorp.com (unknown [147.178.90.120]) by email.iomega.com (Postfix) with ESMTP id D75E826EF for ; Wed, 26 Nov 2003 17:45:35 -0700 (MST) To: linux-fsdevel@vger.kernel.org In-Reply-To: <1069346480.6663.37.camel@patrh9> List-Id: linux-fsdevel.vger.kernel.org No improvement in 2.6.0-test10 with CONFIG_SMP = CONFIG_PREEMPT = default = on. $ uname -msr Linux 2.6.0-test10 i686 $ $ date ; time fswhd 0 768 mkudffs 0xFF600 0xC8 0x1 Wed Nov 26 17:03:48 MST 2003 Linux 2.6.0-test10 i686 /home/pat dd if=/dev/zero of=dd.bin bs=1M seek=0 count=768 2>/dev/null -rw-rw-r-- 1 pat pat 805306368 Nov 26 17:04 dd.bin mkudffs 1.0.0b2 for UDF FS 1.0.0-cvs, 2002/02/09 0 hexdump -C whd0.bin | head -3 00000000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................| * 01f91000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| +++ 2.dmesg 2003-11-26 17:05:38.838645504 -0700 +mplete Error } +UDF-fs DEBUG fs/udf/balloc.c:192:udf_bitmap_free_blocks: bit 2728 already set +UDF-fs DEBUG fs/udf/balloc.c:193:udf_bitmap_free_blocks: byte= 1 +UDF-fs DEBUG fs/udf/balloc.c:192:udf_bitmap_free_blocks: bit 2728 already set real 2m15.777s user 0m2.438s sys 0m6.433s $ $ date ; time fswhd 0 768 mkudffs 0xFF600 0xC8 0x2 Wed Nov 26 17:07:38 MST 2003 Linux 2.6.0-test10 i686 /home/pat dd if=/dev/zero of=dd.bin bs=1M seek=0 count=768 2>/dev/null -rw-rw-r-- 1 pat pat 805306368 Nov 26 17:12 dd.bin mkudffs 1.0.0b2 for UDF FS 1.0.0-cvs, 2002/02/09 0 hexdump -C whd0.bin | head -3 00000000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................| * 01ff0000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| hexdump -C whd1.bin | head -3 00000000 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................| * 02ffb000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| +++ 2.dmesg 2003-11-26 17:17:52.278145752 -0700 +logicalvol: FileSet found in LogicalVolDesc at block=24, partition=0 +UDF-fs DEBUG fs/udf/balloc.c:192:udf_bitmap_free_blocks: bit 13358 already set +UDF-fs DEBUG fs/udf/balloc.c:193:udf_bitmap_free_blocks: byte=40 +UDF-fs DEBUG fs/udf/balloc.c:192:udf_bitmap_free_blocks: bit 13358 already set real 10m28.744s user 0m7.642s sys 0m10.885s $