Hi, On 12/02/15 at 01:29pm, "Zhou, Wenjian/???" wrote: > I think there is no problem if other test results are as expected. > > --num-threads mainly reduces the time of compressing. > So for lzo, it can't do much help at most of time. Seems the help of --num-threads does not say it exactly: [--num-threads THREADNUM]: Using multiple threads to read and compress data of each page in parallel. And it will reduces time for saving DUMPFILE. This feature only supports creating DUMPFILE in kdump-comressed format from VMCORE in kdump-compressed format or elf format. Lzo is also a compress method, it should be mentioned that --num-threads only supports zlib compressed vmcore. Also worth to mention about the recommended -d value for this feature. Thanks Dave