[Qemu-devel] change the default value of timeout

[Zhang, Yang Z]

Hi all
        Currently, if not using nonblocking mode, the default timeout of 
select() in main_loop_wait is 1000ms. There has no problem if you run few VMs. 
But when running more VMs like 32 or 64, then the problem is coming. Our 
experience shows that when running 64 idle VMs, the pkg C6 residency is 88% by 
default and it goes to 90% when I change timeout to 10s. And 2% means 1 watt in 
my box. Since this is only a timeout value for select, so I suggest to use a 
more reasonable way to set it rather than using a fixed value. For example, 
using an argument to set it by user. But I am not sure whether something else 
is depend on the timeout.

best regards
yang