In the current implementation, parallel dump won't perform well in
--num-threads 1 or -d 31. So this patch add the description of it.
Signed-off-by: Zhou Wenjian <zhouwj-fnst(a)cn.fujitsu.com>
kexec-kdump-howto.txt | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kexec-kdump-howto.txt b/kexec-kdump-howto.txt
index b4cdc22..00ab96b 100644
@@ -627,6 +627,9 @@ For example:
1 has better performance than 2, if THREAD_NUM is larger than two
and the usable cpus number is larger than THREAD_NUM.
+Limitation: Parallel feature will introduce extra costs to each page(including
+filtered page). So it will always have worse performance when the THREAD_NUM
+is 1 or -d 31 is specified.
Notes on how to use multiple cpus on a capture kernel on x86 system:
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