Date: Thu, 12 Nov 1998 11:46:46 -0800 From: Wayne Scott <wscott@ichips.intel.com> To: cvs-all@FreeBSD.ORG Cc: mike@smith.net.au Subject: Re: sendfile.2 (was Re: cvs commit: ...) Message-ID: <199811121946.LAA02237@pdxlx008.pdx.intel.com> In-Reply-To: Your message of "Fri, 06 Nov 1998 20:14:49 PST." <199811070414.UAA21183@hub.freebsd.org>
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> That's about consistent with expectations; context switch from one > process context to another is about as fast as it can be. Crossing the > user:kernel protection boundary is not so easy - one of the major > shortcomings of the i386 architecture it seems. > Read the info on the SYSENTER instruction. Intel is finally documenting it properly. http://developer.intel.com/design/pentiumii/manuals/243689.htm It is an ugly hack, but you can switch from user to kernel twice as fast as other methods. (PII only unfortunatly) -Wayne Wayne Scott MD6 Architecture - Intel Corp. wscott@ichips.intel.com Work #: (503) 613-5063 Disclaimer: All views expressed are my own opinions, and not necessarily those of Intel Corporation. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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