Lzo is proven faster than zlib, for large memory machine it will
extremely shorten the time for saving vmcore. Let's switch to lzo as the
default compression method for makedumpfile.
The drawback is lzo has a little less compression ratio than zlib. But
considering for most users, speed/time is a more serious concern than
vmcore size. So I think default to lzo will benefit most of the users.
Signed-off-by: WANG Chao <chaowang(a)redhat.com>
---
dracut-kdump.sh | 2 +-
kdump.conf | 6 +++---
kexec-kdump-howto.txt | 18 +++++++++---------
3 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/dracut-kdump.sh b/dracut-kdump.sh
index f38891d..14843f3 100755
--- a/dracut-kdump.sh
+++ b/dracut-kdump.sh
@@ -11,7 +11,7 @@ fi
set -o pipefail
KDUMP_PATH="/var/crash"
CORE_COLLECTOR=""
-DEFAULT_CORE_COLLECTOR="makedumpfile -c --message-level 1 -d 31"
+DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 1 -d 31"
DMESG_COLLECTOR="/sbin/vmcore-dmesg"
DEFAULT_ACTION="reboot -f"
DATEDIR=`date +%Y.%m.%d-%T`
diff --git a/kdump.conf b/kdump.conf
index a0f086a..1bc3064 100644
--- a/kdump.conf
+++ b/kdump.conf
@@ -50,9 +50,9 @@
# automatically be populated with a config file
# appropriate for the running kernel.
# Default core_collector for raw/ssh dump is:
-# "makedumpfile -F -c --message-level 1 -d 31".
+# "makedumpfile -F -l --message-level 1 -d 31".
# Default core_collector for other targets is:
-# "makedumpfile -c --message-level 1 -d 31".
+# "makedumpfile -l --message-level 1 -d 31".
# For core_collector format details please refer to
# kexec-kdump-howto.txt or kdump.conf manpage.
#
@@ -136,7 +136,7 @@
#ssh user(a)my.server.com
#sshkey /root/.ssh/kdump_id_rsa
path /var/crash
-#core_collector makedumpfile -c --message-level 1 -d 31
+#core_collector makedumpfile -l --message-level 1 -d 31
#core_collector scp
#kdump_post /var/crash/scripts/kdump-post.sh
#kdump_pre /var/crash/scripts/kdump-pre.sh
diff --git a/kexec-kdump-howto.txt b/kexec-kdump-howto.txt
index d70781b..7ffeab9 100644
--- a/kexec-kdump-howto.txt
+++ b/kexec-kdump-howto.txt
@@ -438,7 +438,7 @@ is a dump filtering and compression utility provided with kexec-tools.
On
some architectures, it can drastically reduce the size of your vmcore files,
which becomes very useful on systems with large amounts of memory.
-A typical setup is 'core_collector makedumpfile -F -c --message-level 1 -d 31',
+A typical setup is 'core_collector makedumpfile -F -l --message-level 1 -d 31',
but check the output of '/sbin/makedumpfile --help' for a list of all available
options (-i and -g don't need to be specified, they're automatically taken care
of). Note that use of makedumpfile requires that the kernel-debuginfo package
@@ -458,11 +458,11 @@ cp --sparse=always /proc/vmcore <dest-path>/vmcore
ex2.
---
-core_collector "makedumpfile -c --message-level 1 -d 31"
+core_collector "makedumpfile -l --message-level 1 -d 31"
Above will effectively be translated to:
-makedumpfile -c --message-level 1 -d 31 /proc/vmcore <dest-path>/vmcore
+makedumpfile -l --message-level 1 -d 31 /proc/vmcore <dest-path>/vmcore
For dump targets like raw and ssh, in general, core collector should expect
@@ -482,11 +482,11 @@ cat /proc/vmcore | dd of=<target-device>
ex4.
---
-core_collector "makedumpfile -F -c --message-level 1 -d 31"
+core_collector "makedumpfile -F -l --message-level 1 -d 31"
Above will effectively be translated to.
-makedumpfile -F -c --message-level 1 -d 31 | dd of=<target-device>
+makedumpfile -F -l --message-level 1 -d 31 | dd of=<target-device>
ssh dumps core_collector examples:
---------
@@ -500,11 +500,11 @@ cat /proc/vmcore | ssh <options> <remote-location>
"dd of=path/vmcore"
ex6.
---
-core_collector "makedumpfile -F -c --message-level 1 -d 31"
+core_collector "makedumpfile -F -l --message-level 1 -d 31"
Above will effectively be translated to.
-makedumpfile -F -c --message-level 1 -d 31 | ssh <options> <remote-location>
"dd of=path/vmcore"
+makedumpfile -F -l --message-level 1 -d 31 | ssh <options> <remote-location>
"dd of=path/vmcore"
There is one exception to standard output rule for ssh dumps. And that is
scp. As scp can handle ssh destinations for file transfers, one can
@@ -521,9 +521,9 @@ scp /proc/vmcore <user@host>:path/vmcore
About default core collector
----------------------------
Default core_collector for ssh/raw dump is:
-"makedumpfile -F -c --message-level 1 -d 31".
+"makedumpfile -F -l --message-level 1 -d 31".
Default core_collector for other targets is:
-"makedumpfile -c --message-level 1 -d 31".
+"makedumpfile -l --message-level 1 -d 31".
Even if core_collector option is commented out in kdump.conf, makedumpfile
is default core collector and kdump uses it internally.
--
1.8.4.2
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