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Date: Fri, 18 Feb 2011 12:11:34 -0500
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From: "Devon H. O'Dell" <devon.odell@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] Modern development language for Plan 9,
 WAS: Re: RESOLVED: recoving important header file rudely
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2011/2/18 erik quanstrom <quanstro@quanstro.net>:
>> The high level overview is that it is stored in a shared page, mapped
>> into each new process's memory space at start-up. The kernel is never
>> entered; there are no context switches. The kernel has a timer that
>> updates this page atomically.
>
> i wonder if that is uniformly faster. =A0consider that
> making reads of that page coherent enough on a
> big multiprocessor and making sure there's not too
> much interprocesser skew might be slower than a
> system call.

Real world tests show that it is consistently faster. It's probably
cached anyway.

> - erik
>
>