Date: Thu, 12 Nov 1998 13:13:38 -0800 From: Mike Smith <mike@smith.net.au> To: Wayne Scott <wscott@ichips.intel.com> Cc: cvs-all@FreeBSD.ORG, mike@smith.net.au Subject: Re: sendfile.2 (was Re: cvs commit: ...) Message-ID: <199811122113.NAA00637@dingo.cdrom.com> In-Reply-To: Your message of "Thu, 12 Nov 1998 11:46:46 PST." <199811121946.LAA02237@pdxlx008.pdx.intel.com>
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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) Urk. This means recompiling all your user-space binaries, right? That's not going to be very popular. 8( -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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