Re: [PATCH] [RFC] Emulate "lwsync" to run standard user land on e500 cores
From: Scott Wood <hidden>
Date: 2013-10-28 17:52:18
On Fri, 2013-10-25 at 10:25 -0500, James Yang wrote:
On Fri, 25 Oct 2013, Scott Wood wrote:quoted
Has anyone measured how much this slows things down with a typical userspace?Not a measurement of the patch in question but an older similar patch on 3.0.51 (8572 running Debian 5.0.3): $ ./test-lwsync cycles per emulated lwsync = 371 cycles per sync = 36
My point was more to find out how often a typical userspace executes these instructions. From Wolfgang's e-mail it seems the answer is not very often. -Scott