Date: Wed, 24 May 2000 16:56:03 -0600 From: Chuck Paterson <cp@bsdi.com> To: arch@freebsd.org Subject: Re: Preemptive kernel on older X86 hardware Message-ID: <200005242256.QAA14414@berserker.bsdi.com>
next in thread | raw e-mail | index | archive | help
I should point out that what is being proposed here is a totally different model for kernel protection. SPLS go away totally and are replaced by locks, almost always mutexs. Mutexs protect data, not a thread of control. Saying that a SPL is replaced by a mutex is still kind of misleading because the model is so different. I would like to claim that this change is totally performance neutral, but I don't know that for sure, and never will until the work is done. It is however very close to neutral. I can say that a kernel build that takes approximately 30 minutes on an admittedly slow uniprocessor took about 10 seconds less with the SMPng kernel. A build is obviously heavy user time. Chuck To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200005242256.QAA14414>