From: Pat LaVarre <p.lavarre@ieee.org>
To: linux-fsdevel@vger.kernel.org
Subject: Re: zeroes read back more often than appended
Date: 28 Nov 2003 11:20:46 -0700 [thread overview]
Message-ID: <1070043646.3531.17.camel@patrh9> (raw)
In-Reply-To: <1069893904.4318.18.camel@patrh9>
> 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
$
next prev parent reply other threads:[~2003-11-28 18:21 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-20 16:41 zeroes read back more often than appended Pat LaVarre
2003-11-27 0:45 ` Pat LaVarre
2003-11-28 18:20 ` Pat LaVarre [this message]
2003-11-28 18:29 ` Pat LaVarre
-- strict thread matches above, loose matches on Subject: below --
2003-12-11 18:42 Pat LaVarre
2003-10-07 19:02 Pat LaVarre
2003-10-07 20:54 ` Pat LaVarre
2003-10-08 3:49 ` Ben Fennema
2003-10-08 16:41 ` Pat LaVarre
2003-10-08 17:02 ` Pat LaVarre
2003-10-08 17:21 ` Pat LaVarre
2003-10-08 20:32 ` Pat LaVarre
2003-10-09 20:54 ` Pat LaVarre
2003-10-10 0:52 ` Pat LaVarre
2003-10-10 16:39 ` Pat LaVarre
2003-10-10 18:15 ` Pat LaVarre
2003-10-14 0:38 ` Pat LaVarre
2003-10-14 1:48 ` Pat LaVarre
2003-10-20 23:20 ` Pat LaVarre
2003-10-21 14:47 ` Pat LaVarre
2003-10-21 16:46 ` Pat LaVarre
2003-10-21 18:44 ` Pat LaVarre
2003-10-23 18:52 ` Pat LaVarre
2003-10-27 21:55 ` Pat LaVarre
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