To test, I run mpg321 on realtime priority 3, run ppp on realtime priority 4, a little lower than mpg321, and scp over the ppp tunnel on normal priority.
Top(1) shows an average about:
55.2% user, 0.0% nice, 21.5% system, 12.2% interrupt, 11.1% idle
* mpg321 takes average about 70%;
* ppp is seriously slowed down, it takes about 1.5% (normally 17% on full speed);
* sshd almost starves; it takes 0.00% (normally 2%) and only transfer several bytes once several minutes; the otherside scp prompts "stalled".
I'm the kind of newbie think 11.1% idle cpu time to be free cpu resource, because I don't have idle process. I wish to know why, as there are still 11.1% free cpu resource, ppp and sshd doesn't get this share?
Just to be curious. Thank you.
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