add a note to usage section

[iwfratz]

Could you be so kind and add a note to the usage section that dumping memory on a virtual (linux) system needs the parameter timeout=0. Otherwise the dump is most likely not usable. Or set the default value for timeout to 0. That could prevent some trouble, extra work and frustation.

[jtsylve]

Your assertion that you need to disable timeouts to collect memory from Linux VMs is not accurate. If it takes longer than a second to read from a single memory page, then I wonder if something deeper is going on.