4 # Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
7 # Redistribution and use in source and binary forms, with or without
8 # modification, are permitted provided that the following conditions
10 # 1. Redistributions of source code must retain the above copyright
11 # notice, this list of conditions and the following disclaimer.
12 # 2. Redistributions in binary form must reproduce the above copyright
13 # notice, this list of conditions and the following disclaimer in the
14 # documentation and/or other materials provided with the distribution.
16 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 # Alternate buffer flush path test (Not verified)
32 # Apply this patch to amplyfy the problem:
34 # diff -r1.520 vfs_bio.c
36 # < if (bo->bo_dirty.bv_cnt > dirtybufthresh + 10) {
38 # > if (bo->bo_dirty.bv_cnt > dirtybufthresh /*+ 10*/) {
41 dir=/var/tmp/alternativeFlushPath
43 find $dir -type f | xargs rm
44 [ ! -d $dir ] && mkdir -p $dir
46 sed '1,/^EOF/d' < $odir/$0 > $dir/alternativeFlushPath.c
47 cc -o alternativeFlushPath -Wall alternativeFlushPath.c -lthr
48 rm -f alternativeFlushPath.c
51 ./alternativeFlushPath&
56 sysctl -a | grep dirtybuf
58 rm alternativeFlushPath
67 #include <sys/types.h>
69 #include <sys/resource.h>
82 if (getrlimit(RLIMIT_NOFILE, &rlp) == -1)
83 err(1, "getrlimit(RLIMIT_NOFILE)");
86 fd = malloc(rlp.rlim_cur * sizeof(int));
88 for (k = 0; k < 100; k++) {
89 for (i = 0, j = 0; i < (rlp.rlim_cur - 10); i++, j++) {
90 sprintf(name, "f%05d.%05d", mypid, i);
91 if ((fd[i] = open(name, O_CREAT|O_WRONLY, 0666)) == -1) {
92 warn("open(%s)", name);
96 for (i = 0; i < j; i++) {
97 sprintf(name, "f%05d.%05d", mypid, i);
98 if (unlink(name) == -1)
99 warn("unlink(%s)", name);
101 for (i = 0; i < j; i++) {
102 if (close(fd[i]) == -1)
103 warn("close(%d)", i);