From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pat LaVarre Subject: Re: zeroes read back more often than appended Date: 28 Nov 2003 11:20:46 -0700 Sender: linux-fsdevel-owner@vger.kernel.org Message-ID: <1070043646.3531.17.camel@patrh9> References: <1069346480.6663.37.camel@patrh9> <1069893904.4318.18.camel@patrh9> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from email-out2.iomega.com ([147.178.1.83]:37816 "EHLO email.iomega.com") by vger.kernel.org with ESMTP id S263356AbTK1SVT (ORCPT ); Fri, 28 Nov 2003 13:21:19 -0500 Received: from royntex01.iomegacorp.com (unknown [147.178.90.120]) by email.iomega.com (Postfix) with ESMTP id 7144C26C2 for ; Fri, 28 Nov 2003 11:21:18 -0700 (MST) To: linux-fsdevel@vger.kernel.org In-Reply-To: <1069893904.4318.18.camel@patrh9> List-Id: linux-fsdevel.vger.kernel.org > No improvement in 2.6.0-test10 > with CONFIG_SMP = CONFIG_PREEMPT = default = on. Turning SMP off and PREEMPT off again fixes the case of appending nonzero to a single file, again without improving the case of appending nonzero to two or more files. Pat LaVarre P.S. Relevant tty log include: $ egrep 'CONFIG_(SMP|PREEMPT)' .config # CONFIG_SMP is not set # CONFIG_PREEMPT is not set $ $ egrep '^CONFIG_DEBUG' .config CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_SLAB=y CONFIG_DEBUG_INFO=y CONFIG_DEBUG_SPINLOCK_SLEEP=y $ $ date; time fswhd 0 768 mkudffs 0xFF600 0xC8 0x2 Fri Nov 28 10:56:18 MST 2003 Linux 2.6.0-10.udf 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 28 10:57 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 |................| * 06fbc800 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 |................| * 06fbb000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| +++ 2.dmesg 2003-11-28 10:59:03.434667328 -0700 +DF-fs DEBUG fs/udf/super.c:1085:udf_load_logicalvol: Partition (0:0) type 1 on volume 1 +UDF-fs DEBUG fs/udf/balloc.c:192:udf_bitmap_free_blocks: bit 12 already set +UDF-fs DEBUG fs/udf/balloc.c:193:udf_bitmap_free_blocks: byte=70 +UDF-fs DEBUG fs/udf/balloc.c:192:udf_bitmap_free_blocks: bit 13 already set real 2m45.760s user 0m7.849s sys 0m7.472s $ $ date; time fswhd 0 768 mkudffs 0xFF600 0xC8 0x1 Fri Nov 28 11:08:59 MST 2003 Linux 2.6.0-10.udf 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 28 11:09 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 |................| * 0c783000 real 2m12.085s user 0m3.912s sys 0m3.393s $