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| -rw-r--r-- | Documentation/kdump/kdump.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index f7ef34065d54..b0eb27b956d9 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.txt | |||
| @@ -396,6 +396,13 @@ Notes on loading the dump-capture kernel: | |||
| 396 | Note, though maxcpus always works, you had better replace it with | 396 | Note, though maxcpus always works, you had better replace it with |
| 397 | nr_cpus to save memory if supported by the current ARCH, such as x86. | 397 | nr_cpus to save memory if supported by the current ARCH, such as x86. |
| 398 | 398 | ||
| 399 | * You should enable multi-cpu support in dump-capture kernel if you intend | ||
| 400 | to use multi-thread programs with it, such as parallel dump feature of | ||
| 401 | makedumpfile. Otherwise, the multi-thread program may have a great | ||
| 402 | performance degradation. To enable multi-cpu support, you should bring up an | ||
| 403 | SMP dump-capture kernel and specify maxcpus/nr_cpus, disable_cpu_apicid=[X] | ||
| 404 | options while loading it. | ||
| 405 | |||
| 399 | * For s390x there are two kdump modes: If a ELF header is specified with | 406 | * For s390x there are two kdump modes: If a ELF header is specified with |
| 400 | the elfcorehdr= kernel parameter, it is used by the kdump kernel as it | 407 | the elfcorehdr= kernel parameter, it is used by the kdump kernel as it |
| 401 | is done on all other architectures. If no elfcorehdr= kernel parameter is | 408 | is done on all other architectures. If no elfcorehdr= kernel parameter is |