--------
In message 
<canczdfofbvmxptnel4goqxtvp6zd-xrtja4rmuo1racy0jd...@mail.gmail.com>, Warner 
Losh writes:

>The only issue, really, is that this timeout is a busy loop and there may
>be I/O bus contention introduced on these systems.

Does it have to be a busy loop for the entire duration ?

Spin for the median, timeout+poll for the rest of the time ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[email protected]         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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